Explore BrainMass

Electrical Engineering

Transistor Saturation

For the circuit of the figure attached, determine the required values of Rd, R1 and R2 so that the transistor operates in the saturation region with Id=0.5mA and Vd=3V. The enhancement mode PMOS transistor has Vt=-1V and K=0.5mAV^-2. What is the largest value Rd can have while maintaining the transistor in saturation?

Proportional-Rate Feedback Control

Consider the block diagram in the attached figure Q3.1, describing the process under Proportional-Rate Feedback control. 1) Find a closed loop system transfer function in terms of controller gains, Kp, Kd. 2) Find the value gains Kp,Kd such that the resulting Percent Overshoot of the closed loop step response will be equal

Data link question

In order to delimit messages from a stream of bits being exchanged on a data link, a sender marks the beginning and end of each message with a control flag. In order to prevent the receiver from inadvertently detecting the end of a message when a pattern in the data matches the control flag, the sender stuffs extra bits or chara

Block diagram in feedback control system form

I attached a Word document with a circuit: a) Draw a block diagram of the circuit in feedback control system form. b) Derive an expression for Io in terms of Vi and the system parameters Av, Ro, RL, and Rf. c) How should the system be designed to make Io independent of RL? What is the approximate expression for Io in terms

Erlang Problem Described

1. A company needs to provide sufficient private trunks between two switches to accommodate 90% of call attempts among employees during the busy hour. Assume that there will be 560 callers at random times during that hour, and that call duration averages 3 minutes. Employees are instructed to attempt to call using a trunk; if bl

Tones Input In To An Amplifier

Suppose two tones are input in to an amplifier. The tones are pure sinusoids with one at frequencies 8GHz and the other at frequency 8.03GHz,(delta f =0.03GHz). Assume that the transfer characteristic of the amplifier is represented by Vout= ko + k1Vin +k2Vin^2 +k3Vin^3...+k9Vin^9. List the output frequencies of all 3rd order (t

Root Locus for a Closed Loop System

Sketch the root locus for the following closed loop system {see attachment} as {SYMBOL1} varies from -{SYMBOL2} to +{SYMBOL2}. You should calculate all steps and show the positive and negative gain loci. It is recommended that you first find the positive locus and then sketch the negative {SYMBOL2} locus. (Real axis solutions o

Two D-Type Flip-Flop Questions

Please help me solve the following problems. Problem 1: Consider the following circuit (see attached). IC 1 is a 3-bit asynchronous (ripple) counter, positive-edge triggered. At higher speeds propagation delay will affect the proper function of the counter so that the counting sequence is altered. Glitches will be produced

Control Systems.

Please refer to the attached file. Consider the attached unity feedback system with plant transfer function... (attached)

Inverse z Transformation

Use any method to determine the inverse z transform for the following function: X(z) = (z^3-2*z)/((z-2) - left sided sequence

Complex Gaussian Noise

2.a) Using the result for P(I) in Question 1, prove that the n-th moment of complex Gaussian noise is {I^n} = n!(2sigma^2)^n You may use the following result for the Gamma integral Gamma(n-1) = n! = integral x^n exp(-x)dx. b) Hence, obtain an expression for the normalized moments {I^n}/{I}^n c) Deduce that the v

VLSM Exercise

VLSM Exercise Details are : ---> VLSM Exercise: Site A 60 users Serial links Site B Site C Site D Site E 20 users 10 users 10 users 48 users You are given the address. Effectively address all router interfaces using VLSM. Each side of the arrows is a serial interface. Each site has an Ethernet

Multiplexer Conversion

2. Given a 16-to-1 Multiplexer, how many of the following are required: a) Inputs _______ b) Outputs _____ c) Control signals ______ 3. Given the following information: 1. 1024 words (1K) 16 bits/word 8 bits/byte How many bytes are available? _______ 4. Convert the following numbers as indicated a) 255 decim

Received Amplitude-Modulated Signal

In the received amplitude-modulated signal si(t) = A[1 + m(t)]cos2PIfct m(t) has the power spectral density G(m)(f) = (n_m/2)(|f|/fm), |f| <= fm or 0, |f| > fm The received signal is accompanied by noise spectral density n/2. The output signal-to-noise ratio is then?

Waveform with Fourier Transform

A waveform v(t) has a Fourier transform which extends over the range -F to +F in the frequency domain. The square of the waveform v(t), that is, v(t) v(t), then has a Fourier transforms which extends over the range: ============================================== Answers: a) -F to +F b) -2F to +2F c) -3F to +3F d) -4F to +

Frequency-modulated (FM) Signal

A frequency-modulated (FM) signal is by? Correlation receiver is equivalent to the matched-filter receiver? Attached pdf file.

DSP Quantisation Levels

1. An analogue signal is to be sampled from a transducer with an output voltage range of 0 to 10 volts and operating on a 12-volt power supply. The designer has available two analogue to digital converters (ADC): a 3 bit ADC and a 4 bit ADC. For each converter: (a) Supply the quantisation levels (including zero) that are avai

8051_C program definition

Fully explain what the program does by providing manual walk-through i.e. Step through the program by hand indicating state of variables, inputs and outputs at each statement. Give a general overview of what the program does using Layman terms. (See attached word document for program details)

FIR Filter Using Parks-McClellan Algorithm

See attached word document. The problem is taken from 'Digital Signal Processing using Matlab' by Ingle/Proakis. 1. A digital signal y(k) contains a sinusoid of frequency &#960;/2 and a zero mean unit variance Guassian noise w(k), i.e. y(k) = 2cos(&#960; k/2) + w(k) We want to filter out the noise component using 50-th or

DSP analog filter problem

This problem is taken from the Textbook 'Digital Signal Processing using MatLab' by Ingle/Proakis. The below system (in the attached file) acts as an analog filter. The analog signal m(t) is passed through an analog to digital converter and m(k) is the resultant discrete or digital output in the form e^(jw). The discrete sign

Contains basic function in MATLAB files.

Write MATLAB script(s) to plot the basic signals below in two subplots. The upper subplot should be a continuous waveform (don't do g) and the lower subplot should be a discrete plot. a) Sinusoidal waveform b) Exponential Waveform c) Damped Sinusoid d) Sinc function e) Step Function & Square Wave f) Triangle Wave g) Im

Fourier Coefficient

Please work through attached problem and let me know how you did it. Thank you.

Ladder Logic Exercise

Please redraw the equivalent ladder logic diagram used to implement the hardwired circuit drawn in figure 5-48 (see attachment), wired using: a. A limit switch with a single NO contact connected to the PLC input module. b. A limit switch with a single NC contact connected to the PLC input module. Assuming the hardwired cir