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4 - Some Common Loose Ends
Joel L. Dawson, TalkingHeads Wireless, Inc.
Book:

A Guide to Feedback Theory

Published online:

09 April 2021

Print publication:

22 April 2021, pp 147-171
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Summary

The Nyquist stability criterion ushers the advanced student into a truly deep understanding of feedback theory. To master this concept, a student needs two tools from the mathematics of complex analysis: conformal mapping and Cauchy's principle of the argument. In keeping with the goal of making this guide completely self-contained, a few pages of Chapter 4 are devoted to these topics.Afterward, we dive fully into theNyquist criterion and show how it relates to phase margin. A few examples of Nyquist plots (using Bode plots as a guide) are also given in this chapter.