Chicken parm sub Essay Example for Free

Chicken parm sub Essay Chicken parm is the best sub on the planet earth. I used to eat it when I was little my mom used to make for me every Sunday. I used to have it with Pepsi. When we were done we used to go on a bike rides. Me and my family dont do the bike riding any more. When we ate it we say funny old storys about are family. When my friends come over I ate with them but the storys got embarrassing. This is what I like to do when I eat chicken parm. Chicken parmigiana (also referred to as a parmi[1] or parma[2]) is a chicken dish based on the Italian Parmigiana, and is regularly served in Australian pubs.[3] The meal consists of a breaded chicken breast, or chicken schnitzel, covered with a tomato-based neapolitan sauce and cheese. Variations include the addition of a slice of ham or bacon.[4] The dish is typically served with a side of potato chips and salad, although there is some dispute as to whether the chips should be served under or next to the chicken.[5] Size is considered to be a major part of the chicken parmigiana,[5] and increased competition has led to a greater focus on the size of the meal.[3][6] Some restaurants hold competitions with prizes for people who successfully finish a large chicken parmigiana, such as the Parmageddon which was held in an Adelaide Hills pub.[7] The popularity of the chicken parmigiana led to a specialised chicken parmigiana restaurant opening in Melbourne,[5] and the chicken parmigiana is the subject of reviews on dedicated websites which compare the dish as purchased from various pubs within a region.[2][1][5][8] Other meals have also taken on the chicken parmigiana theme, including pies and Subway sandwiches.[9][10] This dish was adopted by the Australians it is originally from Italy. In Italy it was served with pasta, and sometimes garlic bread

VLSI Design and Embedded Systems

VLSI Design and Embedded Systems CHAPTER 1 INTRODUCTION 1.1 Motivation Phase locked loop (PLL) [1-3] is the heart of the many modern electronics as well as communication system. Recently plenty of the researches have conducted on the design of phase locked loop (PLL) circuit and still research is going on this topic. Most of the researches have conducted to realize a higher lock range PLL with lesser lock time [4] and have tolerable phase noise. The most versatile application of the phase locked loops (PLL) is for clock generation and clock recovery in microprocessor, networking, communication systems, and frequency synthesizers. Phase locked-loops (PLLs) are commonly used to generate well-timed on-chip clocks in high-performance digital systems. Modern wireless communication systems employ Phase Locked Loop (PLL) mainly for synchronization, clock synthesis, skew and jitter reduction [5]. Phase locked loops find wide application in several modern applications mostly in advance communication and instrumentation systems. PLL being a mixed signal circuit i nvolves design challenge at high frequency. Since its inspection in early 1930s, where it was used in the synchronization of the horizontal and vertical scans of television, it has come to an advanced form of integrated circuit (IC). Today found uses in many other applications. The first PLL ICs were available around 1965; it was built using purely analog component. Recent advances in integrated circuit design techniques have led to the development of high performance PLL which has become more economical and reliable. Now a whole PLL circuit can be integrated as a part of a larger circuit on a single chip. There are mainly five blocks in a PLL. These are phase frequency detector (PFD), charge pump (CP), low pass loop filter (LPF), voltage controlled oscillator (VCO) and frequency divider. Presently almost all communication and electronics devices operate at a higher frequency, so for that purpose we need a faster locking PLL. So there are a lot of challenges in designing the mentioned different blocks of the PLL to operate at a higher frequency. And these challenges motivated me towards this research topic. In this work mainly the faster locking of the PLL is concentrated by properly choosing the circuit architectures and parameters. The optimization of the VCO circuit is also carried out in this work to get a better frequency precision. 1.2 Organization of Thesis Before going into the details of the PLL, the motivation behind this work is mentioned in the Chapter 1 of the thesis. Chapter 2 briefly describes the whole PLL system. An introduction to the PLL circuit is mentioned in the section 2.1. Section 2.2 contains the detail architecture of the whole PLL system. Different types of PLLs are mentioned in the section 2.3. Section 2.4 explains the basic terms used in the PLL system while the consecutive sections give the details about the noise and application of the PLL. Chapter 3 builds the concepts of optimization. Definition of optimization technique and different circuit optimization techniques are presented in section 3.1 and 3.2 respectively. Section 3.3 gives the brief outline of the concept of geometric programming and convex optimization. The optimization of the CSVCO circuit is explained in section 3.4. The design and synthesis of the PLL is described in Chapter 4. The different design environments used in this work is mentioned in the section 4.1. The adopted design procedure is explained in section 4.2. Section 4.3 gives the design specifications and parameters of the work. The simulation results of the different circuits used in the PLL are depicted in the different sections of the Chapter 5. The performance of the CSVCO designed using convex optimization is compared with that of the traditional method in section 5.3. Section 5.5 gives the different simulation results of the PLL and its performance comparison between schematic and post layout level. At last Chapter 6 provides the conclusion that inferred from the work. CHAPTER 2 PHASE LOCKED LOOP 2.1 Introduction A PLL is a closed-loop feedback system that sets fixed phase relationship between its output clock phase and the phase of a reference clock. A PLL is capable of tracking the phase changes that falls in this bandwidth of the PLL. A PLL also multiplies a low-frequency reference clock CKref to produce a high-frequency clock CKout this is known as clock synthesis. A PLL has a negative feedback control system circuit. The main objective of a PLL is to generate a signal in which the phase is the same as the phase of a reference signal. This is achieved after many iterations of comparison of the reference and feedback signals. In this lock mode the phase of the reference and feedback signal is zero. After this, the PLL continues to compare the two signals but since they are in lock mode, the PLL output is constant. The basic block diagram of the PLL is shown in the Figure 2.1. In general a PLL consists of five main blocks: Phase Detector or Phase Frequency Detector (PD or PFD) Charge Pump (CP) Low Pass Filter (LPF) Voltage Controlled Oscillator (VCO) Divide by N Counter The â€Å"Phase frequency Detector† (PFD) is one of the main parts in PLL circuits. It compares the phase and frequency difference between the reference clock and the feedback clock. Depending upon the phase and frequency deviation, it generates two output signals â€Å"UP† and â€Å"DOWN†. The â€Å"Charge Pump† (CP) circuit is used in the PLL to combine both the outputs of the PFD and give a single output. The output of the CP circuit is fed to a â€Å"Low Pass Filter† (LPF) to generate a DC control voltage. The phase and frequency of the â€Å"Voltage Controlled Oscillator† (VCO) output depends on the generated DC control voltage. If the PFD generates an â€Å"UP† signal, the error voltage at the output of LPF increases which in turn increase the VCO output signal frequency. On the contrary, if a â€Å"DOWN† signal is generated, the VCO output signal frequency decreases. The output of the VCO is then fed back to the PFD in or der to recalculate the phase difference, and then we can create closed loop frequency control system. 2.2 PLL Architecture The architecture of a charge-pump PLL is shown in Figure 2.2. A PLL comprises of several components. They are (1) phase or phase frequency detector, (2) charge pump, (3) loop filter, (4) voltage-controlled oscillator, and (5) frequency divider. The functioning of each block is briefly explained below. 2.2.1 Phase Frequency Detector The â€Å"Phase frequency Detector† (PFD) is one of the main part in PLL circuits. It compares the phase and frequency difference between the reference clock and the feedback clock. Depending upon the phase and frequency deviation, it generates two output signals â€Å"UP† and â€Å"DOWN†. Figure 2.3 shows a traditional PFD circuit. If there is a phase difference between the two signals, it will generate â€Å"UP† or â€Å"DOWN† synchronized signals. When the reference clock rising edge leads the feedback input clock rising edge â€Å"UP† signal goes high while keeping â€Å"DOWN† signal low. On the other hand if the feedback input clock rising edge leads the reference clock rising edge â€Å"DOWN† signal goes high and â€Å"UP† signal goes low. Fast phase and frequency acquisition PFDs [6-7] are generally preferred over traditional PFD. 2.2.2 Charge Pump and Loop Filter Charge pump circuit is an important block of the whole PLL system. It converts the phase or frequency difference information into a voltage, used to tune the VCO. Charge pump circuit is used to combine both the outputs of the PFD and give a single output which is fed to the input of the filter. Charge pump circuit gives a constant current of value IPDI which should be insensitive to the supply voltage variation [8]. The amplitude of the current always remains same but the polarity changes which depend on the value of the â€Å"UP† and â€Å"DOWN† signal. The schematic diagram of the charge pump circuit with loop filter is shown in the Figure 2.4. When the UP signal goes high M2 transistor turns ON while M1 is OFF and the output current is IPDI with a positive polarity. When the down signal becomes high M1 transistor turns ON while M2 is OFF and the output current is IPDI with a negative polarity. The charge pump output current [3] is given by IPDI=IPUMP—IPUMP4Ï€Ãâ€"ΔÎ ¦ =2IPUMP4Ï€Ãâ€"ΔÎ ¦ =IPUMP2Ï€Ãâ€"ΔÎ ¦ =KPDIÃâ€"ΔÎ ¦ (1) Where KPDI=IPUMP2Ï€ (amps/radian) (2) The passive low pass loop filter is used to convert back the charge pump current into the voltage. The filter should be as compact as possible [9].The output voltage of the loop filter controls the oscillation frequency of the VCO. The loop filter voltage will increase if Fref rising edge leads Fin rising edge and will decrease if Fin rising edge leads Fref rising edge. If the PLL is in locked state it maintains a constant value. The VCO input voltage is given by Vinvco = KF Ãâ€" IPDI (3) Where KF is the gain of the loop filter. 2.2.3 Voltage Controlled Oscillator An oscillator is an autonomous system which generates a periodic output without any input. The most popular type of the VCO circuit is the current starved voltage controlled oscillator (CSVCO). Here the number of inverter stages is fixed with 5. The simplified view of a single stage current starved oscillator is shown in the Figure 2.5. Transistors M2 and M3 operate as an inverter while M1 and M4 operate as current sources. The current sources, Ml and M4, limit the current available to the inverter, M2 and M3; in other words, the inverter is starved for current. The desired center frequency of the designed circuit is 1GHz with a supply of 1.8V. The CSVCO is designed both in usual manner as mentioned in [3], [10, 11]. The general circuit diagram of the current starved voltage controlled oscillator is shown in the Figure 2.6. To determine the design equations for the CSVCO, consider the simplified view of VCO in Figure 2.5. The total capacitance on the drains of M2 and M3 is given by Ctot=52Cox(LpWp+LnWn) (4) The time it takes to charge Ctot from zero to VSP with the constant current ID4 is given by t1=VSPID4Ãâ€"Ctot (5) While the time it takes to discharge Ctot from VDD to VSP is given by t1=VDD-VSPID1Ãâ€"Ctot (6) If we set ID4= ID1=ID then the sum of t1 and t2 is given by t1+t2=VDDIDÃâ€"Ctot (7) The oscillation frequency of CSVCO for N number of stage is fosc=1Nt1+t2=IDNCtotVDD (8) This is equal to fcenter when Vinvco=VDD2 (9) The gain of the VCO is given by KVCO=fmax-fminVmax-Vmin HzV (10) 2.2.4 Frequency Divider The output of the VCO is fed back to the input of PFD through the frequency divider circuit. The frequency divider in the PLL circuit forms a closed loop. It scales down the frequency of the VCO output signal. A simple D flip flop (DFF) acts as a frequency divider circuit. The schematic of a simple DFF based divide by 2 frequency divider circuit is shown in the Figure 2.7. 2.3 Types of PLL There are mainly 4 types of PLL are available. They are . Liner PLL Digital PLL All Digital PLL Soft PLL 2.4 Terms in PLL 2.4.1 Lock in Range Once the PLL is in lock state what is the range of frequencies for which it can keep itself locked is called as lock in range. This is also called as tracking range or holding range. 2.4.2 Capture Range When the PLL is initially not in lock, what frequency range can make PLL lock is called as capture range. This is also known as acquisition range. This is directly proportional to the LPF bandwidth. Reduction in the loop filter bandwidth thus improves the rejection of the out of band signals, but at the same time the capture range decreases, pull in time becomes larger and phase margin becomes poor. 2.4.3 Pull in Time The total time taken by the PLL to capture the signal (or to establish the lock) is called as Pull in Time of PLL. It is also called as Acquisition Time of PLL. 2.4.4 Bandwidth of PLL Bandwidth is the frequency at which the PLL begins to lose the lock with reference. 2.5 Noises in PLL The output of the practical system deviates from the desired response. This is because of the imperfections and noises in the system. The supply noise also affects the output noise of the PLL system [12]. There are mainly 4 types of noises. They are explained below. 2.5.1 Phase Noise The phase fluctuation due to the random frequency variation of a signal is called as phase noise. This is mostly affected by oscillators frequency stability. The main sources of the phase noise in PLL are oscillator noise [12-15], PFD and frequency divider circuit. The main components of the phase noise are thermal and flicker noise. 2.5.2 Jitter A jitter is the short term-term variations of a signal with respect to its ideal position in time [16-19]. This problem negatively impacts the data transmission quality. Jitter and phase noise are closely related and can be computed one from another [18]. Deviation from the ideal position can occur on either leading edge or trailing edge of signal. Jitter may be induced and coupled onto a clock signal from several different sources and is not uniform over all frequencies. Excessive jitter can increase bit error rate (BER) of communication signal [19]. In digital system Jitter leads to violation in time margins, causing circuits to behave improperly. 2.5.3 Spur Non-desired frequency content not related to the frequency of oscillation and its harmonics is called as â€Å"Spur†. There are mainly two types of spur. They are reference spur and fractional spur. Reference spur comes into picture in an integer PLL while fractional spur plays a major role in fractional PLL. When the PLL is in lock state the phase and frequency inputs to the PFD are essentially equal. There should not be any error output from the PFD. Since this can create problem, so the PFD is designed such that, in the locked state the current pulses from the CP will have a very narrow width as shown in the Figure 2.9. Because of this the input control voltage of the VCO is modulated by the reference signal and thus produces â€Å"Reference Spur† [20]. 2.5.4 Charge Pump Leakage Current When the CP output from the synthesizer is programmed to the high impedance state, in practice there should not be any current flow. But in practical some leakage current flows in the circuit and this is known as â€Å"charge pump leakage current† [20]. 2.6 Applications of PLL The demand of the PLL circuit increases day by day because of its wide application in the area of electronics, communication and instrumentation. The recent applications of the PLL circuits are in memories, microprocessors, hard disk drive electronics, RF and wireless transceivers, clock recovery circuits on microcontroller boards and optical fiber receivers. Some of the PLL applications are mentioned below. 1. Frequency Synthesis A frequency synthesizer is an electronic system for generating a range of frequencies from a single fixed time base or oscillator. 2. Clock Generation Many electronic systems include processors of various sorts that operate at hundreds of megahertz. Typically, the clocks supplied to these processors come from clock generator PLLs, which multiply a lower-frequency reference clock (usually 50 or 100 MHz) up to the operating frequency of the processor. The multiplication factor can be quite large in cases where the operating frequency is multiple GHz and the reference crystal is just tens or hundreds of megahertz. 3. Carrier Recovery (Clock Recovery) Some data streams, especially high-speed serial data streams (such as the raw stream of data from the magnetic head of a disk drive), are sent without an accompanying clock. The receiver generates a clock from an approximate frequency reference, and then phase-aligns to the transitions in the data stream with a PLL. This process is referred to as clock recovery. 4. SkewReduction This is one of the very popular and earliest uses of PLL. Suppose synchronous pair of data and clock lines enter a large digital chip. Since clock typically drives a large number of transistors and logic interconnects, it is first applied to large buffer. Thus, the clock distributed on chip may suffer from substantial skew with respect to data. This is an undesirable effect which reduces the timing budget for on-chip operations. 5. Jitter and Noise Reduction One desirable property of all PLLs is that the reference and feedback clock edges be brought into very close alignment. The average difference in time between the phases of the two signals when the PLL has achieved lock is called the static phase offset. The variance between these phases is called tracking jitter. Ideally, the static phase offset should be zero, and the tracking jitter should be as low as possible. CHAPTER 3 CONVEX OPTIMIZATION OF VCO IN PLL 3.1 What is an optimization technique? Optimization technique is nothing but the finding of the action that optimizes i.e. minimizes or maximizes the result of the objective function. Optimization technique is applied to the circuits aiming at finding out the optimized circuit design parameter to achieve either the best performance or the desired performance. Optimization techniques are a set of most powerful tools that are used in efficiently handling the design resources and there by achieve the best result. Mainly optimization techniques are applied to the circuit for the selection of the component values, devices sizes, and value of the voltage or current source. 3.2 Types of circuit optimization method There are mainly four types of circuit optimization methods exist. They are Classical optimization Knowledge based optimization Global optimization method Convex optimization and geometric programming 3.2.1 Classical Optimization Methods: In case of analog circuit CAD, classical optimization methods [21], such as steepest descent, sequential quadratic programming, and Lagrange multiplier methods are mainly used. These methods are used with more complicated circuit models, including even full SPICE simulations in each iteration. This method can handle a wide variety of problem. For this there is a need of a set of performance measures and computation of one or more derivatives. The main disadvantage of the classical optimization methods is that the global optimal solution is not possible. This method fails to find a feasible design even one exist. This method gives only the local minima instead of global solution. Since many different initial designs are considered to get the global optimization, the method becomes slower. Because of the human intervention (to give â€Å"good† initial designs), the method becomes less automated. The classical methods become slow if complex models are used. 3.2.2 Knowledge-Based Methods: Knowledge-based and expert-systems methods such as genetic algorithm or evolution systems, systems based on Fuzzy logic, and heuristics-based systems have also been widely used in analog circuit CAD [21]. In case of knowledge based methods, there are few limitations on the types of problems, specifications, and performance measures that are to be considered. These methods do not require the computation of the derivatives. This is not possible to find a global optimal design solution using these methods. The final design is decided on the basis of the initial design chosen and the algorithm parameters. The disadvantage of the knowledge based methods is that they simply fail to find a feasible solution even when one may exist. There is a need of human intervention during the design and the training process. 3.2.3 Global Optimization Methods: Global optimization methods such as branch and bound and simulated annealing are also used in analog circuit design [21]. These methods are guaranteed to find the global optimal design solution. The global optimal design is determined by the branch and bound methods unambiguously. In each iteration, a suboptimal feasible design and also a lower bound on the achievable performance is maintained by this method. This enables the algorithm to terminate non-heuristically, i.e., with complete confidence that the global design has been found within a given tolerance. The branch and bound method is extremely slow, with computation growing exponentially with problem size. The trapping in a locally optimal design can be avoided by using simulated annealing (SA). This method can compute the global optimal solution but not guaranteed. Since there is no real-time lower bound is available, so termination is heuristic. This method can also handle a wide variety of performance indices and objects. T he main advantage of SA is that it handles the continuous variables and discrete variables problems efficiently and reduces the chances of getting a non-globally optimal design. The only problem with this method is that it is very slow and can not guarantee a global optimal solution. 3.2.4 Convex Optimization and Geometric Programming Methods: Geometric programming methods are special optimization problems in which the objective and constraint functions are all convex [22-24]. Convex optimization technique can solve the problems having a large number of variables and constraints very efficiently [22]. The main advantage of this method for which people generally adopt is that the method gives the global solution. Infeasibility is unambiguously detected. Since a lower bound on the achievable performance is given, so the method uses a completely non- heuristic stopping criterion. 3.3 Geometric programming and convex optimization Geometric programming is a special type of optimization technique in which all the objective must be convex. Before applying this technique it has to confirm that whether the given problem is convex optimization problem or not. Convex optimization problem means the problem of minimizing a convex function subject to convex inequality constraints and linear equality constraints. In IC integration convex optimization and geometric programming has become a more efficient computational tool for optimization purpose. This method has an ability to handle thousands of variables and constraints and solve efficiently. The main advantage of convex optimization technique is that it gives the global optimized value and the robust design. The fact that geometric programs can be solved very efficiently has a number of practical consequences. For example, the method can be used to simultaneously optimize the design of a large number of circuits in a single large mixed-mode integrated circuit. The de signs of the individual circuits are coupled by constraints on total power and area, and by various parameters that affect the circuit coupling such as input capacitance, output resistance, etc. Convex optimization is used to find out the optimized value of these parameter and sizing of the devices in the circuit [25]. Another application is to use the efficiency to obtain robust designs i.e., designs that are guaranteed to meet a set of specifications over a variety of processes or technology parameter values. This is done by simply replicating the specifications with a (possibly large) number of representative process parameters, which is practical only because geometric programs with thousands of constraints are readily solved. A real valued function fx defined on an interval (space) is called convex if ftx1+1-tx2≠¤tfx1+1-tfx2 (11) For every t,0 In the Figure 3.1 function fx is represented as a convex function on an interval. The convex optimization problem is in the form of minimize f0x Subjected to fix≠¤1 , i=1, 2, 3†¦, m gix=1 , i=1, 2, 3†¦, p xi>1 , i=1, 2, 3†¦, n Where fix is a posynomial function gix is a monomial function Let x1,x2†¦Ã¢â‚¬ ¦xn be n real positive variables. We can denote the vector (xi,xi†¦Ã¢â‚¬ ¦.xi) of these variables asx. A function f is called a posynomial function of x if it has the form fix1,x2†¦Ã¢â‚¬ ¦xn=k=1tCkx1ÃŽ ±1kx2ÃŽ ±2k†¦..xnÃŽ ±nk (12) Where Cj≠¥0 and ÃŽ ±ij à Ã‚ µ R. The coefficients Cj must be nonnegative but the exponents ÃŽ ±ij can be any real numbers including negative or fractional. When there is exactly one nonzero term in the sum i.e. t=1 and C1>0, we call f is a monomial function. 3.3.1 Advantages:  § Handle thousands of variables and constraints and solve efficiently.  § Global optimization can be obtained. 3.3.2 Disadvantages: * Strictly limited to types of problems, performance specification and objectives that can be handled. 3.4 Optimization of the VCO circuit In my earlier design of the VCO circuit, the sizes of all the five inverter stages are same. Now the convex optimization technique is applied to find out the optimal scaling ratio of the different inverter stages to get the optimal design with a better performance. There are 5 inverter stages and the design has to give a delay of 100ps. The load capacitance of the VCO circuit is 65 fF. All these design constraints are formulated and applied to the convex optimization technique. Mainly optimization techniques are applied for selection of component values and transistor sizing. In this work I have used the geometric programming technique to find out the optimized scaling ratio of the different stages in CSVCO to meet the desired center frequency with lesser deviation. Let xi is the scaling ration of the ith stage, CL is the load capacitance, and D is the total delay of the inverter stages then optimization problem is in the form of Minimize sum (xi) Subjected to CL≠¤CLmax D≠¤Dmax Where CLmax and Dmax are required design parameters and has a constant value. CHAPTER 4 DESIGN AND SYNTHESIS OF PLL 4.1 Design Environment The schematic level design entry of the circuits is carried out in the CADENCE Virtuoso Analog Design Environment. The layout of the PLL is designed in Virtuoso XL using GPDK090 library. In order to analyze the performances, these circuits are simulated in the Spectre simulator of CADENCE tool. Different performance indices such as phase noise, power consumption and lock time are measured in this environment. Transient, parametric sweep and phase noise analyses are carried out in this work to find out the performances of the circuit. The optimization of the current starved VCO circuit, the scale factor for transistor sizing is found out using the MATLAB environment. 4.2 Design Procedure 4.2.1 VCO Design Since VCO is the heart of the whole PLL system, it should be designed in a proper manner. The design steps for the current starved VCO are as follows. Step 1 Find the value of the propagation delay for each stage of the inverter in the VCO circuit using the following equation. Ï„p=1Nf (13) Where Ï„p= Ï„phl= Ï„plh= half of the propagation delay time of the inverter N= no of inverter stages f= required center frequency of oscillation Step 2 Find the WL ratio for the transistors in the different inverter stages using the equation in below. WL n=CloadÏ„phl µnCoxVdd-VT,n2VT,nVdd-VT,n+ln4Vdd-VT,nVdd-1 (14) WL p=CloadÏ„plh µpCoxVdd-VT,p2VT,pVdd-VT,p+ln4Vdd-VT,pVdd-1 (15) Step 3 After finding the WL ratio, find the values for W and L. Step 4 Find the value of the total capacitance form the expression Ctot=52Cox(LpWp+LnWn) (16) Where Cox is the oxide capacitance Lp,Wp,Ln,Wn is the width and length of the PMOS and NMOS transistors in the inverter stages. Step 5 Calculate the value of drain current for the center frequency which is given by IDcenter=NCtotVddf (17) Step 6 Find the WL ratio for the current starving transistors in the circuit from the drain current expression which is represented as WL n=2Ãâ€"IDcenter µnCoxVgs-VT,n2 (18) Similarly WL p=2.5Ãâ€"WL n (19) 4.2.2 Design of Phase Locked Loop The value of the charge pump current and the component parameters of the loop filter play a major role in the design of the phase locked loop circuit. The value of the lock time mainly depends upon these parameters. So while designing the circuit proper care should be taken in calculating these parameters. For the given values of reference(Fref) and output frequency(Fout) as well as the lock in range, the following steps to be carried out in designing the filter circuit. Step 1 Find the value of the divider circuit to be used which is given by n=FoutFref (20) Step 2 Find the value of the natural frequency (ωn) from the lock in range as given below lock in range=2Ãâ€"ÃŽ ¾Ãƒâ€"ωn (21) Step 3 Find the value of the charge pump gain (KPDI) from the charge pump current used in the circuit which is given by KPDI=Ipump2Ï€ (Amps/radian) (22) Step 4 Find the value of the gain of the VCO (Kvco) circuit from the characteristics curve using the following expression. Kvco=fmax-fminVmax-Vmin (Hz/V) (23) Step 5 Find the values of the loop filter component parameters using the following expressions. C1=KPDIÃâ€"KvcoNωn2 (24) C2=C110 (25) R=2ÃŽ ¾Ãâ€°nC1 (26) 4.3 Design Specifications and Parameters 4.3.1 VCO Design Specification The current starved VCO design specifications are mentioned in the following table. Table 1 VCO design specifications 4.3.2 VCO Design Parameters Table 2 List of design parameters of the CSVCO circuit 4.3.3 PLL Design Parameters The whole PLL system design specifications and parameters are shown in the Table 3. Parameter Value Reference frequency((Fref) 500 MHz output frequency(Fout) 1 GHz Lock in range 100 MHz

Allied Health Professionals and Occupational Therapists

Allied Health Professionals and Occupational Therapists Annabelle Butterick INTRODUCTION The following essay discusses occupational therapists as Allied Health Professionals and who they work with. Occupational therapists work with many Allied Health Professionals. Two of these Allied Health Professionals will be discussed further in this essay to understand the interdisciplinary team and the importance of communication between these Allied Health Professionals. Occupational therapists work with many allied health professionals such as psychologists and physiotherapists to provide support and treatment for patients such as those who have suffered from a stroke (Willis, Reynolds, Keleher, 2016). This essay also discusses crucial communication skills and the impact this has on patient outcome. UNDERSTANDING YOUR PROFESSION The aim of occupational therapy is to allow clients to participate in everyday activities (occupations) which are relevant to them. Each client has different needs and activities which they like to do each day, therefore, the aims and goals for the client is individualized and specific for them. To help the client engage in these different occupations independently the occupational therapist adjusts their environment or even the activity to allow the client to maintain their level of independence. Clients have different views for certain activities such as shopping, some find it like a chore but others may find it enjoyable (What is occupational therapy?, 2017). Occupational therapists can work in a variety of areas such as with children, rehabilitation and aged care, acute care, injury management and mental health. Children may require help to achieve milestones which are important to their development such as hand-eye coordination. Occupational therapists help aged care clients and in rehab to improve daily life after a surgery or after a health event such as a stroke. In acute care, occupational therapists assess the clients function and needs and then monitor their development. Through changing the work environment and creating a work program this allows injured people to return to work safely. Occupational therapists are also able to create strategies to help the client cope with their mental health issues and also help to improve their confidence and self-esteem (What do occupational therapists do?, 2017). Occupational Therapist work in a client-centred framework. This is where the occupational therapist works with the client to set aims and identify issues which affects their occupational performance. Occupational therapists work with clients from a variety ages from newborn children to people in their very elderly years (Willis, Reynolds, Keleher, 2016). BEGINNINGS OF UNDERSTANDING AN INTERDISCIPLINARY TEAM Physiotherapist Physiotherapists aim to help their patients develop, maintain and restore their maximum movement and functional ability of the body. They use their problem-solving skills to assess the situation, interpret the findings and then analyze the findings to plan an individualized treatment for the patient. Physiotherapists help anyone from premature babies to the elderly in palliative care environments. Physiotherapists mostly work in hospital environments in a variety of clinical fields. Examples of these clinical fields include musculoskeletal, cardiorespiratory, womens health, neurological and many other clinical fields (Willis, Reynolds, Keleher, 2016). Physiotherapist help their patient with goal-setting, however, patients may feel they cannot achieve the goal and therefore, not participate in the process or the physiotherapist may not be as active in the process with their patient as they may feel their patient has communication issues which may hold them back. Goal-setting is a major aspect of physiotherapy; therefore, physiotherapists need to be able to achieve success goals with their patient. Physiotherapists may use approaches such as SMART (Specific, Measurable, Achievable, Realistic and Timed) to help their patient achieve the goal. Goal-setting in physiotherapy is much more than a physiotherapist asking questions and the patient answering, therefore, physiotherapists may use open questions to help gather information on the patient to help formulate a goal (Schoeb, Staffoni, Parry, Pilnick, 2014). Psychologist Psychologists aim to help people achieve a meaningful and happier life through assessing and diagnosing a variety of issues. Psychologists then develop many approaches and treatments for their patient whilst also providing support and direction. Psychologist are often seen as only working in mental health however, they also work in many other areas like disability, family services, community, schools, education, health, sport, performing art and even corporate and business. Majority of the population at one point in their life may require to see a psychologist (What is a psychologist?, 2016). There are many areas of psychology like general practicing psychologists, clinical neuropsychology, clinical psychology, community psychology, counseling psychology, educational and developmental psychology, forensic psychology, health psychology, organizational psychology and sport and exercise psychology (Areas of Psychology, 2016). Psychologists have a significant impact in general health care as they are able to engage in a variety of settings (examples of these are inpatient and outpatient in mental and traditional health care settings). Psychologists were able to engage in areas such as the assessment such as telling someone they have cancer or another terminal illness, intervention such as cardiovascular and liaison where they are able to provide care during death and when a patient is dying (Puente, 2011). THE INTERDISCIPLINARY TEAM This interdisciplinary team is able to work together to provide different skills and support for the patient. An example of this is a person who has had a stroke. For someone who has had a stroke, occupational therapists assist the patient to improve daily activities. A physiotherapist is able to help the patient with their function such as balance, gait, and movement of the body. Psychologists are able to support the patient with any cognitive impairments. Stroke can be a cause of adult disability therefore, a psychologist who works in a disability area can a patient overcome the cognitive thoughts which occur with reduced function and movement. Through working together these health professionals are able to provide an interdisciplinary team who will aim for the best patient outcome (Langhorne, Bernhardt, Kwakkel, 2011). Two crucial skills that will be required as an Occupational Therapist part of an Interdisciplinary team such as the one provided will be mutual understanding and communication. Allied Health professionals such as Occupational Therapists need to interact and communicate uniquely with the individual such as the patient or another health professional which may be part of the interdisciplinary team. Health professionals part of an interdisciplinary team need to develop mutual understanding where each person is able to connect and understand one another. Mutual understanding between health professionals allows for effective communication where the interdisciplinary team are able to negotiate and discuss in detail the patients treatment plan (OToole, 2012). Health professionals of an interdisciplinary team need to adjust their communication according to the receiver. Each health professional needs to adjust their language to suit their target audience as different words have different meanings to each health profession. The choice of communication is able to provide respect to the other individuals which further enhances mutual understanding and provides effective communication. Health professionals also needs to recognize other health professionals strengths and skills within an interdisciplinary team to collaborate and provide success patient-centred care. (Suter, week 1 readings) Together this communication skills are crucial to create effective communication which is linked with positive and successful patient outcomes (Suter et al., 2009). CONCLUSION Communication is a vital importance in an interdisciplinary team, which if effective can lead to successful patient outcome. An example of an interdisciplinary team composed of an occupational therapist, physiotherapist and psychologist explores these health professionals collaboration to provide support and treatment for a stroke patient. This scenario is able to show the significance of communication in health professions and the collaboration of a variety of allied health professionals to provide successful patient outcome. Occupational therapists, physiotherapist, and psychologist use different methods and strategies, therefore, effective communication in this interdisciplinary team to increase positive patient outcome. Reference List Areas of Psychology. (2016). Australian Psychological Society. Retrieved 29 March 2017, from http://www.believeinchange.com/Home/About-Us/Areas-of-Psychology Langhorne, P., Bernhardt, J., Kwakkel, G. (2011). Stroke rehabilitation (1st ed., pp. 1693-1702). Retrieved from http://www.sciencedirect.com/science/article/pii/S0140673611603255 OToole, G. (2012). Communication: core interpersonal skills for health professionals (2nd ed., pp. 1-9). Chatswood: Elsevier. Puente, A. (2011). Psychology as a Health Care Profession (1st ed., pp. 781 792). Retrieved from http://ovidsp.tx.ovid.com/sp-3.24.1b/ovidweb.cgi?QS2=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 Schoeb, V., Staffoni, L., Parry, R., Pilnick, A. (2014). What do you expect from physiotherapy?: a detailed analysis of goal setting in physiotherapy (1st ed., pp. 1679 1686). Retrieved from http://www.tandfonline.com/doi/abs/10.3109/09638288.2013.867369 Suter, E., Arndt, J., Arthur, N., Pardbossingh, J., Taylor, E., Deutschlander, S. (2009). Role understanding and effective communication as core competencies for collaborative practice (1st ed.). Retrieved from http://flex.flinders.edu.au/file/c85f8697-7556-4b81-90de-31a342a8583f/1/Role%20understanding%20and%20effective%20communication%20as%20core%20competencies%20for%20collaborative%20practice.pdf What do occupational therapists do?. (2017). Occupational Therapy Australia. Retrieved 29 March 2017, from https://www.otaus.com.au/about/what-do-occupational-therapists-do What is a psychologist?. (2016). Australian Psychological Society. Retrieved 29 March 2017, from http://www.believeinchange.com/Home/About-Us/What-is-a-psychologist What is occupational therapy?. (2017). Occupational Therapy Australia. Retrieved 29 March 2017, from https://www.otaus.com.au/about/what-is-occupational-therapy Willis, E., Reynolds, L., Keleher, H. (2016). Understanding the Australian health care system (3rd ed., pp. 301 328). Elsevier.

Computer Crimes :: essays research papers

Computer Crimes Computer crimes are on the rise 1 in 10 Americans experience some form of a malicious attack on their computer system. If you pay attention to the rest of this speech you will understand how a Hackers mind works and how to defend yourself from them. In this speech I will tell you why and how people break into computers, what sorts of trouble they cause, and what kind of punishment lie ahead for them if caught. Hackers and Crackers break into computer systems for any of a wide variety of reasons. Many groups break into computers for capital gain while still others do it as a means to pass time at work or at school. For most it's a thrill to figure out how to break into a computer. Most people never have any intention of causing harm. I believe that for the vast majority of people it's merely the thrill of the "hunt" at pushes them to such great lengths. Many employees that work in large corporations feel that they don't get paid as much as they should. Therefore if they have high security clearance they are able to capitalize from that by selling the data they have access to on the black-market. Whether it be Ford Motor companies plan for the 1999 F-150 or spec sheets for the military's new bomber it happens everyday. Too by left is a drawing that illustrates the method that most Hackers use to take over your computer. Ever since the dial-up connection was invented anyone with a modem had the ability to wreck any one of thousands of computers. One of the most talked about forms of computer crime is computer viruses. A computer virus is a small but highly destructive program written by an unscrupulous computer Hacker. Back in 1984 a 17 year old computer Hacker single handedly brought down four hundred thousand computers in a matter of hours. Too my left is a graph depicting the # of computer crimes comited from 1988 till now. Some Hackers create a program called a worm. A worm is a piece of malicious software and is part of the virus family. People write worms to transfer money from bank accounts into their own personal checking account. Another way that Hackers cause trouble is by altering the telephone switching networks at MCI, AT&T, and Sprint. By doing this they are able to listen to any conversation they choose. Often-times they will listen in on the Police and FBI communicating with each-other. This allows them to move to a new location

What A Day! :: Computers Internet Papers

What A Day! Pamela, Pamela, Pamela, what can I say she is a typical modern day mother. At work she is the woman who takes care of everyone else, she is the one who brings cookies and cakes everyday to share with everyone. I can see her now in her maroon 2001 Chrysler Mini van with vinyl interior so that the children don't mess up the seats! Driving along with her flowered dress, hair band, flat sandals, loads of jewelry and too much blue eye shadow, which by the way doesn't match her out fit, accompanied by her bulging purse that is filled with everything including the kitchen sink. This morning was a good one; she had orange juice with coffee, blueberry pancakes with butter and syrup. She isn't up in time very many mornings to make a full breakfast for herself, her three children and her husband; well you might as well say her four children. She just got her red hair permed and teased just the way she likes it a few days ago. Pamela is just so stylish in her everyday attire. Somehow s he finds the time to read her favorite book The Client, by John Grisham, and every once in awhile she even gets to watch her favorite movie Where the Heart Is. After a long day in the office as a secretary she is comforted to know that only four more weeks and she off to Disney World for a week of summer vacation with her kids. Pamela just got home from work. Each day after she gets home she reads her emails from her friends, which usually are about the most recent gossip. Today Pamela got an email that was quite frightening. The email was a forward from her friend Danielle and it contained a link to a website which was about a deadly chemical called dihydrogen oxide. This awful chemical is odorless, colorless, and tasteless, but it kills thousands of people each year. Pamela became scared and called her three children in the room with her to read about this terrible chemical. She continued to read her email aloud: â€Å"Most of the deaths caused by DHO are by accidental inhalation. Prolonged exposure to the chemical in its solid form can cause severe tissue damage.

Night World : The Chosen Chapter 1

It happened at Rashel's birthday party, the day she turned five years old. â€Å"Can we go in the tubes?† She was having her birthday at a carnival and it had the biggest climbing structure of tubes and slides she had ever seen. Her mother smiled. â€Å"Okay, kitten, but take care of Timmy. He's not as fast as you are.† They were the last words her mother ever said to her. Rashel didn't have to be told, though. She always took care of Timmy: he was a whole month younger than she was, and he wasn't even going to kindergarten next year. He had silky black hair, blue eyes, and a very sweet smile. Rashel had dark hair, too, but her eyes were green-green as emeralds, Mommy always said. Green as a cat's. As they climbed through the tubes she kept glancing back at him, and when they got to a long row of vinyl-padded stairs-slippery and easy to slide off of-she held out a hand to help him up. Timmy beamed at her, his tilted blue eyes shining with adoration. When they had both crawled to the top of the stairs, Rashel let go of his hand. She was heading toward the spider web, a big room made entirely of rope and net. Every so often she glanced through a fish-bowl window in one of the tubes and saw her mother waving at her from below. But then another mother came to talk to hers and Rashel stopped looking out. Parents never seemed to be able to talk and wave at the same time. She concentrated on getting through the tubes, which smelled like plastic with a hint of old socks. She pretended she was a rabbit in a tunnel. And she kept an eye on Timmy-until they got to the base of the spider web. It was far in the back of the climbing structure. There were no other kids around, big or little, and almost no noise. A white rope with knots at regular intervals stretched above Rashel, higher and higher, leading to the web itself. â€Å"Okay, you stay here, and I'll go up and see how you do it,† she said to Timmy. This was a sort of fib. The truth was that she didn't think Timmy could make it, and if she waited for him, neither of them would get up. â€Å"No, I don't want you to go without me,† Timmy said. There was a touch of anxiety in his voice. â€Å"It's oilly going to take a second,† Rashel said. She knew what he was afraid of, and she added, â€Å"No big kids are going to come and push you.† Timmy still looked doubtful. Rashel said thoughtfully, â€Å"Don't you want ice cream cake when we get back to my house?† It wasn't even a veiled threat. Timmy looked confused, then sighed heavily and nodded. â€Å"Okay. I'll wait.† And those were the last words Rashel heard him say. She climbed the rope. It was even harder than she'd thought it would be, but when she got to the top it was wonderful. The whole world was a squiggly moving mass of netting. She had to hang on with both hands to keep her balance and try to curl her feet around the rough quivering lengths of cable. She could feel the air and sunlight. She laughed with exhilaration and bounced, looking at the colored plastic tubes all around her. When she looked back down for Timmy, he was gone. Rashel's stomach tensed. He had to be there. He'd promised to wait. But he wasn't. She could see the entire padded room below the spider web from here, and it was empty. Okay, he must have gone back through the tubes. Rashel made her way, staggering and swaying, from one handhold to another until she got to the rope. Then she climbed down quickly and stuck her head in a tube, blinking in the dimness. â€Å"Timmy?† Her voice was a muffled echo. There was no answer and what she could see of the tube was empty. â€Å"Timmy!† Rashel was getting a very bad feeling in her stomach. In her head, she kept hearing her mother say, Take care of Timmy. But she hadn't taken care of him. And he could be anywhere by now, lost in the giant structure, maybe crying, maybe getting shoved around by big kids. Maybe even going to tell her mother. That was when she saw the gap in the padded room. It was just big enough for a four-year-old or a very slim five-year-old to get through. A space between two cushiony walls that led to the outside. And Rashel knew immediately that it was where Timmy had gone. It was like him to take the quickest way out. He was probably on his way to her mother right now. Rashel was a very slim five-year-old. She wiggled through the gap, only sticking once. Then she was outside, breathless in the dusty shade. She was about to head toward the front of the climbing structure when she noticed the tent flap fluttering. The tent was made of shiny vinyl and its red and yellow stripes were much brighter than the plastic tubes. The loose flap moved in the breeze and Rashel saw that anyone could just lift it and walk inside. Timmy wouldn't have gone in there, she thought. It wouldn't be like him at all. But somehow Rashel had an odd feeling. She stared at the flap, hesitating, smelling dust and popcorn in the air. I'm brave, she told herself, and sidled forward. She pushed on the tent beside the flap to widen the gap, and she stretched her neck and peered inside. It was too dark to see anything, but the smell of popcorn was stronger. Rashel moved farther and farther until she was actually in the tent. And then her eyes adjusted and she realized that she wasn't alone. There was a tall man in the tent. He was wearing a long light-colored trench coat, even though it was warm outside. He didn't seem to notice Rashel because he had something in his arms, and his head was bent down to it, and he was doing something to it. And then Rashel saw what he was doing and she knew that the grown-ups had lied when they said ogres and monsters and the things in fairy-tale books weren't real. Because the tall man had Timmy, and he was eating him.

Children of the City Essay

Amadis ma Guerrero was born in Ermita, Manila in 1941, hegraduated from the Ateneo de manila in 1965 from theUniversity of Santo Tomas in 1959. His short story â€Å"Children of the City† is a departure from his usual style. It won the PalancaAwards in 1971. Setting This story happened in the late 1980’s. Everything occurredin the dark perilous busy streets of Manila. Boulevard . streets of avenida Characterization -Victor He is a boy from Intramuros. At the age of eight, he loses hisfather and his mother abandons him for some other man. He ishired as a newsboy by his uncle and starts his life on the streets.Innocent and young, he ponders on the menace and vices of hiscolleagues and the people all around him. -Victor’s Dad A good-natured man and a loving father to Victor, he was apart of a worker’s strike. The man loved his son dearly and hisdeath brought a huge blow to Victor. -Victor’s Mom She loved Victor’s dad but never cared felt any affection forher son. She took her husband’s death grievously. But later on,she ignores Victor, becomes a prostitute, then leaves Victor to hisUncle to go away with her new lover. -Tio Pedring Victor’s uncle, he adopted victor after the leaving of hissister. He forces victor to become a newspaper boy. -Nacio He is a newspaper boy. He was victor’s new friend. Thoughfull of cruel vices, Victor took his death as another major loss. Summary The father of the boy Victor got involved in a strike. He actsas though it was nothing and takes Victor to night walks aroundManila. He takes Victor’s mind off vices and promises Victor abright future someday.One day, during the strike. Victor’s father was shot dead inthe heart. His wife mourned greatly and his son was subdued. Thewife began to disappear late at night and come home early dawn.She refuses to take care of Victor. And then, she comes homewith some goon, telling that the goon will be Victor’s new dad.Victor didn’t like the stranger at all. As often as possible, he triesto stay out of his mom and her lover’s way.And then, Victor just woke up with his mother and the mangone. His Uncle Pedring introduces to take care of him. Herecruits Victor to a newspaper job. The man does not treat Victorwell unless he brings home money.During his job, Victor meets Nacio. Nacio was also anewspaper boy. He taught Victor various tricks in newspaperselling. They become close friends.Victor’s job grew prosperous. Soon, his â€Å"Boss† starts to trusthim with a ration of 20 papers a day. He becomes contented withhis life until-Nacio was run over a car. He was dead. Victor grieved for hisfriend just like the way he did with his father. He gets beaten upwith the other kids.His colleagues beat him up whenever he refuses to smoke orsay curse words†¦ Victor was defiant at first. But after long, tiredof being tossed around like a stray dog-Victor finally gave up. Moral lesson The story ended when the author realized how cruel theworld is†¦Ã¢â‚¬ Ã¢â‚¬ ¦ And Victor, swirled the life of the city: this city, flushed withtriumphant charity campaigns, where workers were made to signstatements certifying they received minimum wage, wheremillionaire politicians received Holy Communion every Sunday,where mothers taught their sons and daughters the art of begging, where orphans and children from broken homes slept onpavements and under darkened bridges, and where best friendsfell out and betrayed one another.† This world is mean indeed†¦ people become the way theyare, not because of fate, but of how the people around themrevolve. Children of politicians study at universities and tend toget spoiled. Whereas, orphans are shunned downwards and areleft to fill the streets and crawl under the powerful’s shoes. The story shows us the way life turns and how what webecome rests upon our defiance and decisions. This has been ahackneyed phrase through the decades but it portrays some kindof truth.