Explanation Given Information: A feedback amplifier having loop-gain T ( f ) = ( 100 ) β ( 1 + j ( f 10 5 ) ) 3 and phase margin 60 0 Calculation: Here, for the given loop gain, the frequency corresponding to the given phase margin is to be calculated so that it can be used to find the feedback factor as follows. The phase margin represents the phase angle ϕ , such that the magnitude of loop gain is unity at a frequency corresponding to a phase of 180 ° − ϕ . For the given phase margin ϕ = 60 ° , the phase for the given function is, 180 0 − 60 0 = 120 0 . This gives the phase of the given loop gain, − ( 180 0 − 60 0 ) = − 3 tan − 1 ( f 10 5 ) − 120 0 = − 3 tan − 1 ( f 10 5 ) 40 0 = tan − 1 ( f 10 5 ) Taking tangent of angle on both sides, tan ( 40 0 ) = tan ( tan − 1 ( f 10 5 ) ) 0.8390 = ( f 10 5 ) f = 8

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 12.17TYU

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The value of feedback factor for the given value.

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Chapter 12, Problem 12.16TYU

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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 value of feedback factor for the given value.

Solution Summary: The author explains the value of feedback factor for the given value. The phase margin represents the phase angle varphi .

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Chapter 12 Solutions