Patent ID: 7003031

Claim:
A pulse width modulating device comprising: a clock generating device which generates a first clock signal; an operation device which operates the first clock signal and generates at least one processing clock signal whose phase is different than a phase of the first clock signal; a pulse width modulating signal output device which makes a pulse of a pulse width modulating signal rise synchronously with one of the first clock signal and the processing clock signal generated by said operation device, and makes the pulse of the pulse width modulating signal fall synchronously with a remaining one of the first clock signal and the processing clock signal generated by said operation device; and a counter which, after the pulse of the pulse width modulating signal is made to rise, counts a number of pulses of the remaining one of the first clock signal and the processing clock signal generated by said operation device, wherein after said counter has counted a predetermined number of pulses, said pulse width modulating signal output device makes the pulse fall synchronously with the remaining one of the first clock signal and the processing clock signal generated by said operation device.