2002•IEEE Transactions on Circuits and Systems I Fundamental Theory and ApplicationsRequires access

An approach to test the open-loop parameters of feedback amplifiers

Gianluca Giustolisi, G. Palumbo

Abstract

A novel method for determining open-loop parameters, such as unity-gain frequency and phase margin, in feedback amplifiers is given. It is based on relations between open-loop and closed-loop configurations and is very useful for evaluating the above parameters in a unity-gain amplifier from a simple measure of its closed-loop 3 dB cutoff frequency and the respective phase for a given feedback factor /spl beta/. The approach is validated by simulations of an ideal amplifier and of a real OTA. Moreover, measures carried out for a /spl mu/A-741 operational amplifier show a percentage error between real and calculated values lower than 2%.

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Key concepts: Phase margin, Open-loop gain, Amplifier, Control theory (sociology), Loop gain, Negative feedback amplifier, Open-loop controller, Feedback loop