Patent ID: 6969980

Claim:
A pulse width modulator operable so as to provide control signals for controlling on and off operations of a pair of switches of a passive network, a feedback voltage signal being obtained from the passive network, said pulse width modulator comprising: an amplifier module adapted to receive the feedback voltage signal, and operable so as to generate first and second non-inverted voltage signals and first and second inverted voltage signals in response to the feedback voltage signal; a comparator module including a first differential amplifier that has a first input terminal for receiving the first non-inverted voltage signal, a second input terminal for receiving the first inverted voltage signal, and an output terminal for providing a first differential voltage signal corresponding to the first non-inverted voltage signal and the first inverted voltage signal, and a second differential amplifier that has a first input terminal for receiving the second inverted voltage signal, a second input terminal for receiving the second non-inverted voltage signal, and an output terminal for providing a second differential voltage signal corresponding to the second non-inverted voltage signal and the second inverted voltage signal; a filter module coupled between said amplifier module and said comparator module, said filter module being operable so as to attenuate high frequency components of one set of the first and second non-inverted voltage signals and the first and second inverted voltage signals; and a flip-flop having an input side that receives the first and second differential voltage signals, and an output side that provides the control signals in response to the first and second differential voltage signals.