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Question 4 a) Derive an expression for the close loop gain of an amplifier if negative feedback is employed. b) The gain of an amplifier system is frequency dependent and is given by: A(F) = for f > fn and A(f) = and f < fi, where fn and fi are the high and low cut off frequencies and Ao is open loop gain of the amplifier. Show how the cut off frequencies are affected when negative feedback is employed in an amplifier circuit. 1+4 c) The open loop gain of an amplifier changes by 30% due to changes in parameters of the active amplifying device. If a change of gain by 2% is allowed and the gain with feedback is 10, find the minimum value of the open loop gain.

Question 4 a) Derive an expression for the close loop gain of an amplifier if negative feedback is employed. b) The gain of an amplifier system is frequency dependent and is given by: A(F) = for f > fn and A(f) = and f < fi, where fn and fi are the high and low cut off frequencies and Ao is open loop gain of the amplifier. Show how the cut off frequencies are affected when negative feedback is employed in an amplifier circuit. 1+4 c) The open loop gain of an amplifier changes by 30% due to changes in parameters of the active amplifying device. If a change of gain by 2% is allowed and the gain with feedback is 10, find the minimum value of the open loop gain.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Question 4 a) Derive an expression for the close loop gain of an amplifier if negative feedback is employed. The gain of an amplifier system is frequency dependent and is given by: A(F) = for f > fn and A(f) = 4, and f < fi, where fn and fi are the high and b) 1+4 low cut off frequencies and Ao is open loop gain of the amplifier. Show how the cut off frequencies are affected when negative feedback is employed in an amplifier circuit. c) The open loop gain of an amplifier changes by 30% due to changes in parameters of the active amplifying device. If a change of gain by 2% is allowed and the gain with feedback is 10, find the minimum value of the open loop gain.
Transcribed Image Text:Question 4 a) Derive an expression for the close loop gain of an amplifier if negative feedback is employed. The gain of an amplifier system is frequency dependent and is given by: A(F) = for f > fn and A(f) = 4, and f < fi, where fn and fi are the high and b) 1+4 low cut off frequencies and Ao is open loop gain of the amplifier. Show how the cut off frequencies are affected when negative feedback is employed in an amplifier circuit. c) The open loop gain of an amplifier changes by 30% due to changes in parameters of the active amplifying device. If a change of gain by 2% is allowed and the gain with feedback is 10, find the minimum value of the open loop gain.
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