A Study of Equilibrium Points and Stability in a Nonlinear Model of a Phase-Compensated Operational Amplifier

Abstract

A nonlinear model is derived for a phase-compensated operational amplifier. Instead of well-known s-domain small-signal analysis, which linearizes the system equations with respect to an operating point, we locate all equilibrium points and study the stability of important ones. Two important conclusions incorporating novel, yet simple, design equations to improve stability and linearity are stated.