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Electronic Engineering

Fourier analysis using Excel

The supply current was sampled 1024 times over a very short time interval. The data so obtained is given in column B of the accompanying Excel worksheet (see attached). This worksheet has been set up to give a graph showing the spectral components of the data. Question 3 i) Obtain the Fourier Transform for the data using t

General Electrical Engineering Questions

1. For the circuit given in FIGURE 1 the power factor is 0.72 lagging and the power dissipated is 375 W. FIG. 1 (see attachment) Determine the: (i) apparent power (ii) reactive power (iii) the magnitude of the current flowing in the circuit (iv) the value of the impedance Z and state whether circuit is inductive or capac

DC Circuit Properties

See attachment for better symbol representation and diagrams. 1. The diagram of FIGURE 1 represents a meter shunted by a parallel resistance RS. (a) Determine the required value of the shunt resistance if the maximum value of the current I is 200 A. The meter can read a maximum of 1 mA and has a resistance

Waveform analysis and inverse Laplace transforms

1. For the waveform shown in FIGURE 1 (see attached file), estimate: (a) the damping factor (you may compare response with a standard chart) (b) the forced or damped frequency of oscillation (c) the natural or undamped frequency 2. Complete the following inverse Laplace transforms (see attached files)

Transmission Errors in System A

See the attached file. 2. System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is, a repeater failure is, and a bridge failure is, derive an expression for parts (a) to (e). 50 points a) Probability of fail

Solve: Unit Pulse Response

Please show the detailed steps: Compute the unit-pulse response h[n] for the discrete-time system y[n+2]+2y[n+1]+y[n]=x[n] (for n = 0, 1, 2, 3).

Plotting through matlabMatlab

Consider a finite-support signal x(t) = t 0<=t<=1 and zero elsewhere. - Using Matlab, plot x(t+1) - Using Matlab, plot x(-t+1) - Add the above two signals together and plot the new signal y(t).

Output voltage, maximum error and potentiometer characteristics

a) Calculate the value of Output voltage at 50% b) Draw a graph of the 'tapper' position, Vo. c) Indicate on the graph the ideal characteristics of such a system. d) Calculate the maximum error as a percentage of the true value. e) Suggest how the system could be improved to give a characteristic closer to the idea The in

NMOS FET and BJT Analysis

Show all logic/work/sources leading up to the conclusions drawn for each problem. 1. In an NMOS FET, why does the drain current reach a maximum value, independent of increasing drain-to-source voltage? 2. Quite frequently, one needs to control a light emitting diode with a microprocessor output pin. A typical LED requi

Op-amp circuit measurements

The op-amp circuit measures the changes of temperature in a system. The output voltage is given by v0(t) = -R(t)vi(t). Suppose that the temperature in the system changes cyclically after t = 0, so that R(t) = [1 +0.5 cos(20πt)] u(t) and let the input voltage be vi(t) = 1 volt. Assuming that the switch closes at t0 = 0 sec,

Circuit Analysis - Calculating Voltage and Overall Resistance

Please refer to the attachment questions and diagrams. Questions are asking to calculate overall resistance, voltage, and finding the values for input impedance and output impedance. l. Assume the transistor you will use has a beta of 155 and V_BE(on)=0.65 V. For the circuit in Fig. 2. (attached) calculate the overall resista

Transients in R-L-C circuits

Please see attached file on Transients in RLC circuits and Laplace transform. Please complete the following examples and show detailed workings and narratives including transposition of formula and graphical display where required.

Silicon High-Speed Diode Characteristics

The measured I-V characteristics of a silicon high-speed diode (BAS16) are given in TABLE 1, below. (i) Plot a graph of the diode's forward characteristic. (ii) Compare the values of the diode's dynamic resistance and reverse current as obtained from TABLE 1 with those predicted by the diode equation. Attempt to account for

Control System - Frequency of Oscillation

A- For the feedback control system equation s³ +(1+k) s²+10s+(5+15k)=0 The parameter k must be positive. What is the maximum value k can assume before the system becomes unstable? When k is equal to the maximum value, the system oscillates. Determine the frequency of oscillation. B- For the feedback control sys

Transmission Lines Problem

The whole system is operating at 1 GHz (a) Find the Ls and Cp so that Zeq is 50 Ohm. (b) Find out the power dissipated in RL when Zeq is 50 Ohm (c) Find out the power dissipated in RL when Zeq is 50 Ohm but the characteristic impedance of the transmission line Z0 is 100 Ohm. Please refer to attached PDF for full question

Convolutional codes: trellis diagram

Consider a (3,1,2) convolutional code with the generator for the encoder, g1 = (101), g2 = (111), and g3 = (111). (1) Draw the encoder diagram for the encoder. (2) Draw the trellis diagram for the information sequence (11011). (3) Suppose the received sequence R = (111,010,000,011,100,011,111); decode R by use of Viterbi algo

Tuning methods for PID controllers

I am investigating tuning methods for PID controllers of 2nd order and 3rd order control systems. Eg. Zieglar Nichols, etc. . Will 2nd and 3rd order DC Servo Motor control systems offer enough rigour and challenge to the tuning methods or should I chose another control system to model and to compare tuning methods? The PID

Euler's equation and orthogonality

Euler's equation e^j?=cos?(?)+j sin?(?), is very useful not only in obtaining the rectangular and polar forms of complex numbers, but in many respects as we will explore in this problem. Carefully plot x[n]=e^(j(pi)n) for-infinity.

QPSK in the ATSC System

The ATSC broadcast television system used in the U.S. transmits video signals at an average rate of 18.34 Mbps and employs 8-VSB modulation. QPSK modulation would allow receivers to achieve the same BER as 8-VSB at a lower CNR, increasing the range of the broadcast transmitters. Why isn't QPSK used in the ATSC system?

Varley bridge/ Wheatstone bridge

The Varley loop test is a method of fault location in telecom and pilot wire circuits where fairly high circuit resistances are encountered. This solution determines the distance to the fault. 3. A Varley Bridge is connected to a faulty three-core copper cable by two identical copper leads of resistance R1. (a) Show that for

Motorola MC68000 Microprocessor Unit (MPU) Programming

With reference to the Motorola MC68000 microprocessor unit (MPU): Refer to the array and storage map drawn in Figure 2A and the list of instructions tabulated in Table 2 and hence, in MC68000 assembler language, write a program to print the contents of an array of data stored in memory. The array (DATA) comprises sixteen (16)

Computation of Z-Transform-Matlab

Computation of Z-transform - MATLAB Consider a discrete-time pulse x[n] = u[n] - u[n - 10]. a) Plot x[n] as a function of n and use the definition of the Z-transform to find X(z). b) Use the Z-transform of u[n] and properties of the Z-transform to find X(z). Verify that the expressions obtained above for X(z) are identi

Current to Voltage Op Amp Circuit

A 12-bit DAC (Digital to Analogue Converter) gives an output range of 0 to ââ?¬"1 mA for a digital input word of 0 to 4095. The required output, however, is for a bipolar voltage range of Ã?±5 V. (a) Design a current-to-voltage converter circuit to achieve the required bipolar output voltage.

Poles, stability and steady-state response

The steady-state solution of stable systems is due to simple pole in the j-Omega axis of the s-plane coming from the input. Suppose the transfer function of the system is H(s) = Y(s)/X(s) = 1 / [(s+1)^2 + 4] (a) Find the poles and zeros of H(s) and plot them in the s-plane. Find then the corresponding impulse response h(t

Signal Energy and RC Circuit - Matlab

Please see attachment for complete question. The signal x(t) = e^(-|t|) is defined for all values of t. (a) Plot the signal x(t) and determine if this signal is finite energy. (b) If you determine that x(t) is absolutely integrable, could you say that x(t) has finite energy? Explain why or why not. Hint: Plot |x(t)| an