Microelectronics: Circuit Analysis and Design

4th Edition

ISBN: 9780073380643

Author: Donald A. Neamen

Publisher: McGraw-Hill Companies, The

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Chapter 12, Problem 12.6P

The open-loop gain of an amplifier is A = 5 × 10 4 . If the open-loop gain decreases by 10 percent, the closed-loop gain must not change by more than 0.1 percent. Determine the required value of the feedback transfer function β and the closed-loop gain A f .

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Chapter 12, Problem 12.5P

Chapter 12, Problem 12.7P

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(a) Calculate the sensitivity of the closed-loop input resistance of the series-shunt feedback ampliﬁer with respect to changes in open-loop gain A:SRinA = A/ Rin ∂Rin/ ∂A (b) Use this formula to estimate the percentage change in closed-loop input resistance if the openloop gain A changes by 10 percent for an ampliﬁer with A = 94 dB and β = 0.01. (c) Calculate the sensitivity of the closed-loop output resistance of the series-shunt feedback ampliﬁer with respect to changes in open-loop gain A:SRout A = A /Rout ∂Rout /∂A (d) Use this formula to estimate the percentage changeinclosed-loopoutputresistanceiftheopenloop gain A changes by 10 percent for an ampliﬁer with A =100 dB and β =0.01.

Analyze the circuit shown in Figure Shown.(i) Determine the type of negative feedback used in the circuit by showingthe suitable process. (ii) Derive the equation for the feedback factor and the gain of the circuit. (ii) Calculate the feedback factor and the gain of the circuit if R1 = 1.2 kΩ,R2 = 15 kΩ and RL = 6.8 kΩ.

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Chapter 12 Solutions

Microelectronics: Circuit Analysis and Design

Ch. 12 - (a) The open-loop gain of an amplifier is A=5104...Ch. 12 - (a) Consider a general feedback system with...Ch. 12 - (a) A feedback amplifier has an open-loop...Ch. 12 - (a) Consider the circuit shown in Figure...Ch. 12 - (a) The closed-loop gain of a feedback amplifier...Ch. 12 - The gain factors in a feedback system are A=5105...Ch. 12 - Prob. 12.3TYU Ch. 12 - An ideal series-shunt feedback amplifier is shown...Ch. 12 - Consider the ideal shunt-series feedback amplifier...Ch. 12 - An ideal series-series feedback amplifier is shown...

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The open-loop gain of an amplifier is A = 5 × 10 4 . If the open-loop gain decreases by 10 percent, the closed-loop gain must not change by more than 0.1 percent. Determine the required value of the feedback transfer function β and the closed-loop gain A f .

Solution Summary: The author compares the feedback transfer function and the closed loop gain for the given conditions of the amplifier.

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Chapter 12 Solutions