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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 ☐

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 ☐

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter11: Thermostats, Pressure Switches, And Other Electric Control Devices
Section: Chapter Questions
Problem 23RQ
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I need help 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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