Patent ID: 6696891
Filing Date: 2004-02-24
Classification: H03F

Abstract:
A class D amplifier comprising:an integrating circuit for integrating an input signal; a flash A/D converter for A/D converting an output signal of the integrating circuit; a waveform converting circuit for producing a PWM signal including a pulse width corresponding to a digital value output from the flash A/D converter; a switching circuit, for producing an amplified signal, including a pair of switching elements connected between a first power source and a second power source, a junction portion of the pair of switching elements being connected to a load; a driving circuit for driving the pair of switching elements on the basis of the PWM signal output from the waveform converting circuit; and a feedback circuit which is connected between the junction point of the pair of switching elements and an input side of the integrating circuit, and negatively feeds back the amplified signal that is to be supplied to the load.