Maurice Tutor

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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 10 Dec 2017 My Price 8.00

loop gain

*11.39 This problem deals with the series–shunt feedback amplifier of Fig. P11.29 and overlaps somewhat with Problem 11.29. Thus, if you have already solved 11.29, you can use some of the results in the solution of this problem. The devices operate with VBE = 0.7 V and have β1 = β2 = 100. The input signal Vs has a zero dc component. Resistances Rs = 100Ω, R1 = 1 kΩ, R2 = 10 kΩ, and RL = 1 KΩ

. (a) If the loop gain is large, what do you expect the closed-loop gain Vo/Vs to be? Give both an expression and its approximate value.

(b) Find the dc emitter current in each of Q1 and Q2. Also find the dc voltage at the emitter of Q2.

(c) Sketch the A circuit without the dc sources. Derive expressions for A, Ri , and Ro, and find their values.

(d) Give an expression for β and find its value.

(e) Find the closed-loop gain Vo/Vs, the input resistance Rin , and the output resistance Rout . By what percentage does

the value of Af differ from the approximate value found in (a)?

Problem 11.29.

11.29 In the series–shunt feedback amplifier shown in Fig. P11.29, the devices operate with VBE = 0.7 V and have β1 = β2 = 100. The input signal Vs has a zero dc component. Resistances Rs = 100Ω, R1 = 1 kΩ, R2 = 10 kΩ, and RL = 1 kΩ.

 (a) If the loop gain is large, what do you expect the closed-loop gain to be? Give both an expression and its value.

 (b) Find the dc emitter current in each of Q1 and Q2. Also, find the dc voltage at the emitter of Q2.

(c) Calculate the value of the loop gain Aβ. (Hint: Set Vs =0 and break the loop at the base of Q1. Simplify the circuit

by eliminating dc sources.) (d) Calculate the value ofAf

 

 

 

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Maurice Tutor
(5)
Status NEW Posted 10 Dec 2017 08:12 PM My Price 8.00

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