EQUAL AREA METHOD OF EVALUATING THE DESCRIBING FUNCTION

Abstract

A graphical method of approximation to the describing function is presented and evaluated as the ratio of the total area in one period of the output waveform to the total area in one period of the input sinusoid. The values so obtained are compared for different input amplitudes and for different nonlinearities with those obtained byconventional methods. The error in all these cases is shown to be within 8 per emphasizing the usefulness and simplicity of this new method for many types of non-linearities.