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electricalstudent Latest Questions

Asked: August 30, 2023In:

7.33 Figure P7.33 shows a discrete-circuit amplifier. The input signal vsig is coupled to the gate through a very large capacitor (shown as infinite). The transistor source is connected to ground at signal frequencies via a very large capacitor (shown as infinite). The output voltage signal that develops at the drain is coupled to a load resistance via a very large capacitor (shown as infinite). All capacitors behave as short circuits for signals and as open circuits for dc. (a) If the transistor has Vt = 1 V, and kn = 4 mA/V2, verify that the bias circuit establishes VGS = 1.5 V, ID = 0.5 mA, and VD = +7.0 V. That is, assume these values, and verify that they are consistent with the values of the circuit components and the device parameters. Figure P7.33 (b) Find gm and ro if VA = 100 V. (c) Draw a complete small-signal equivalent circuit for the amplifier, assuming all capacitors behave as short circuits at signal frequencies. (d) Find Rin, vgs/vsig, vo/vgs, and vo/vsig.

Venkyelectrical
Enlightened

7.33 Figure P7.33 shows a discrete-circuit amplifier. The input signal vsig is coupled to the gate through a very large capacitor (shown as infinite). The transistor source is connected to ground at signal frequencies via a very large capacitor (shown ...

microelectronics by sedra & smith chapter 7 questions
Asked: August 30, 2023In:
Venkyelectrical
Enlightened

7.48 The transistor amplifier in Fig. P7.48 is biased with a current source I and has a very high β. Find the dc voltage at the collector, VC. Also, find the value of re. Replace the transistor with the T ...

microelectronics by sedra & smith chapter 7 questions
Asked: August 23, 2023In:
Venkyelectrical
Enlightened

4.74 The circuit in Fig. P4.74 implements a complementary-output rectifier. Sketch and clearly label the waveforms of and . Assume a 0.7-V drop across each conducting diode. If the magnitude of the average of each output is to be 12 ...

microelectronics by sedra & smith chapter 4 questions
Asked: August 31, 2023In:

D *7.121 The MOSFET in the circuit of Fig. P7.121 has Vt = 0.8 V, kn = 5 mA/V2, and VA = 40 V. (a) Find the values of RS, RD, and RG so that ID = 0.4 mA, the largest possible value for RD is used while a maximum signal swing at the drain of ±0.8 V is possible, and the input resistance at the gate is 10 MΩ. Neglect the Early effect. (b) Find the values of gm and ro at the bias point. (c) If terminal Z is grounded, terminal X is connected to a signal source with a resistance of 1 MΩ, and terminal Y is connected to a load resistance of 10 kΩ, find the voltage gain from signal source to load. (d) If terminal Y is grounded, find the voltage gain from X to Z with Z open-circuited. What is the output resistance of the source follower? (e) If terminal X is grounded and terminal Z is connected to a current source delivering a signal current of 50 µAand having a resistance of 100 kΩ, find the voltage signal that can be measured at Y. For simplicity, neglect the effect of ro. Figure P7.121 (a) 9.5 kΩ; (b) 12.5 kΩ; 10 MΩ; (b) 2 mA/V, 100 kΩ; (c) −9.6 V/V; (d) 0.946 V/V, 473 Ω; (e) 0.6 V

Venkyelectrical
Enlightened

D *7.121 The MOSFET in the circuit of Fig. P7.121 has Vt = 0.8 V, kn = 5 mA/V2, and VA = 40 V. (a) Find the values of RS, RD, and RG so that ID = 0.4 mA, the largest ...

microelectronics by sedra & smith chapter 7 questions
Asked: August 23, 2023In:
Venkyelectrical
Enlightened

D *4.59 Design a diode voltage regulator to supply 1.5 V to a 1.5- kΩ load. Use two diodes specified to have a 0.7-V drop at a current of 1 mA. The diodes are to be connected to a +5-V ...

microelectronics by sedra & smith chapter 4 questions
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On: November 1, 2023 Comments: 0

3. In this question, we use MATLAB to implement a sampling and reconstruction of the signal f(t) = (5 sin(87t) + 6 sin(167t), Osts 0, otherwise a (a) Use MATLAB to plot the signal for

3. In this question, we use MATLAB to implement a sampling and reconstruction of the signal f(t) = (5 sin(87t) + 6 sin(167t), Osts 0, otherwise a (a) Use MATLAB to plot the signal for
Auto Draft
(more…)
On: November 1, 2023 Comments: 0

generate AM signal in time domain and frequency spectrum using MATLAB

Below is a good starting point for your program:

% Clear and initialize variables

clear
close all
hold off
N=2^18; % Number of sample points
Fs=2^14; % sample frequency is 16,384 Hz is to be power of 2
% because we are using the FFT and not the DFT
Ts=1/Fs;
fc=1000; % carrier frequency is 1 kHz
fm=100; Ac=10; % message frequency is 100 Hz, amplitude is 10
mu2=1.0; % 100% modulation
mu1=0.5; % 50% modulation
t=(0:N-1)*Ts; % Time vector

a complete executable matlab code is pasted below

(more…)
On: October 31, 2023 Comments: 0

P2.4Let x(n) = {2,4, -3, 1, -5, 4, 7}. Generate and plot the samples (use the stem function) of the following sequences.

P2.4
Let x(n) = {2,4, -3, 1, -5, 4, 7}. Generate and plot the samples (use the stem function) of
the following sequences.

  1. x1(n) = 2x(n – 3) + 3x(n + 4) – x(n)
  2. x2 (n) = 4x(4 + n) + 5x(n + 5) + 2x(n)
  3. x3 (n) = x(n + 3)x(n – 2) + x(1 – n)x(n + 1)
  4. x4 (n) = 2e0.5𝑛x(n) + cos(0.1πn) x(n + 2) , -10 ≤ n ≤ 10

sigshift.m is required for this which is attached here

unction [y,n] = sigshift(x,m,n0)

% implements y(n) = x(n-n0)

% -------------------------

% [y,n] = sigshift(x,m,n0)

%

n = m+n0; y = x;
(more…)
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