Transistor-feedback-amplifier design
H.G. Brierley, S.S. Hakim · Proceedings of the Institution of Electrical Engineers · 1965
Formulas are given to help in the estimation of the positions of poles and zeros of the open-loop gain of an uncorrected transistor amplifier. Design curves are provided to enable the determination of a modified pole-zero configuration which will yield a desired gain and phase margin against oscillation. A synthesis procedure is described which yields a network making the necessary modifications to the pole-zero configuration. Formulas for element values enable the process to be carried out with simple arithmetic calculations for a type of amplifier commonly encountered.This process does not involve the usual practice of measuring the open-loop frequency response of the uncorrected amplifier and then correcting this to approximate to Bode's ideal-loop-gain characteristic. This correction usually involves either fitting a required loss curve with a rational function or an equally tedious ‘cut-and-try’ experimental process.