Abstract
Analog performance has been improved by careful design, new process, or feedback. Feedback is the only systematic way to enhance analog performance such as linearity, signal range, bandwidth, and impedance. Series (voltage) feedback increases linear voltage range while shunt (current) feedback increases linear current range. Also series feedback raises impedance while shunt feedback lowers impedance. Low impedance is for broad-banding while high impedance is for buffering. Feedback can be applied at any local to global levels, in continuous-time or discrete-time modes, and in broadband or DC servo applications. All feedback circuits from local to global and from series to shunt are handled consistently using the loop gain and phase margin concepts.
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