Chapter 12, Problem 12.77P A feedback system has an amplifier with a low-frequency open-loop gain of 5 × 104 and has poles at 103 Hz, 105 Hz, and 107Hz (a) Determine the frequency f180 at which the phase of the loop gain is 180 degrees. (b) Determine the feedback transfer function ẞ for which the phase margin of the system is 45°. (c) Using the results of part (b), determine the low-frequency closed-loop gain. SAVE ☐

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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I am having trouble understanding part B. see attached photo

Chapter 12, Problem 12.77P
A feedback system has an amplifier with a low-frequency open-loop gain of 5 × 104 and has poles at 103 Hz, 105 Hz,
and 107Hz (a) Determine the frequency f180 at which the phase of the loop gain is 180 degrees. (b) Determine the
feedback transfer function ẞ for which the phase margin of the system is 45°. (c) Using the results of part (b),
determine the low-frequency closed-loop gain.
SAVE ☐
Transcribed Image Text:Chapter 12, Problem 12.77P A feedback system has an amplifier with a low-frequency open-loop gain of 5 × 104 and has poles at 103 Hz, 105 Hz, and 107Hz (a) Determine the frequency f180 at which the phase of the loop gain is 180 degrees. (b) Determine the feedback transfer function ẞ for which the phase margin of the system is 45°. (c) Using the results of part (b), determine the low-frequency closed-loop gain. SAVE ☐
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