Stability of a class of pulse-frequency modulated control systems

A new class of pulse-frequency modulated (PFM) control systems, called discrete sigma PFM (DΣPFM), is presented. This new class has properties very similar to sigma PFM (ΣPFM) systems. In addition, sufficient conditions for the asymptotic stabililty of this new class are given utilizing an extension of the Popov stabiity criterion.