Abstract
Developed herein are detailed mathematical expressions for the stability analysis of single sign integral pulse frequency modulation (SSIPFM) control systems by the dual input describing function (DIDF). The necessary conditions, the d.c. condition and the a.c. condition, for producing limit cycle oscillations in the system, under zero or step inputs, are presented. This work suggests that for such a system it is more efficient to use the DIDF than the DF (describing function) method. The advantages of using this particular method in studying the stability of certain neurophysiological control systems is emphasized.
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