Patent ID: 6992610
Filing Date: 2006-01-31
Classification: H02M,H03F,H03K,H03M

Abstract:
1. A pulse width modulation (PWM) signal generator comprising a signal generating device for generating one or two pulses which have a pulse width or a total pulse width corresponding to a value represented by a pulse code modulation digital signal and which have a symmetric positional relationship with respect to the position of one half of a predetermined length, as a first pulse width modulation signal, wherein said signal generating device includes a PCM (pulse code modulation)-PWM converter which generates a first pulse and a second pulse in accordance with the value represented by the digital signal, and a difference detector which outputs the difference between the first pulse and the second pulse, as the first pulse width modulation signal, and when the value represented by the digital signal is zero, the first pulse and the second pulse are equal to each other in pulse width, and when the value represented by the digital signal changes by one, one of the first and second pulses does not change in pulse width and the other of the first and second pulses changes in pulse width by two slots.