Patent ID: 6642875
Filing Date: 2003-11-04
Classification: H03M

Abstract:
A pulse width modulation (PWM) converting circuit that carries out PWM conversion of each value of digital input data for each bit of a basic clock pulse train, and outputs a result of the conversion as a PWM signal, said PWM converting circuit comprising:a pulse generator for generating two pulse signals asserting one of a low level and a high level, for each bit of a basic clock pulse train in response to value of digital input data; and a differential amplifier for outputting a differential amplification component between the two pulse signals as the PWM signal, wherein said pulse generator varies pulse width of a first of the two pulse signals, on a bit-by-bit basis, of the basic clock pulse train, in response to the value of the digital input data, and holds a level of a second of the two pulse signals throughout the bits of the basic clock pulse train.