Patent ID: 6778011
Filing Date: 2004-08-17
Classification: H03F

Abstract:
A power amplifier circuit comprising: a pulse-width modulation circuit that contains an integrator for providing an integrated output thereof as a first output signal and a comparator for comparing the first output signal with an input signal to produce a pulse-width modulation signal, which is subjected to positive feedback to the comparator, thus providing hysteresis characteristics;a low-pass filter for performing low-pass filleting on the pulse-width modulation signal to output, second output signal; and a negative feedback circuit for negatively feeding beck the second output signal to the comparator, wherein an output terminal of the comparator is connected to an input terminal of the comparator via a resistor by which the pulse-width modulation signal cutout from the comparator is positively fed back to the comparator and wherein the resistor is directly connected to the output of the comparator.