Patent ID: 6924700
Filing Date: 2005-08-02
Classification: H03F

Abstract:
1. A class D amplifier comprising: a pulse modulator for generating a pulse modulated signal; a correction circuit for correcting a feedback signal input thereto by feedback in reference to said pulse modulated signal; and a power switch for generating a voltage signal on the basis of a correction signal output from said correction circuit, wherein said feedback signal is generated on the basis of said voltage signal, said correction circuit includes: a first integrator for performing integration on the basis of said pulse modulated signal; a second integrator for performing integration on the basis of said feedback signal; a first subtracter for obtaining a difference between a first integrated signal output from said first integrator and a second integrated signal output from said second integrator; a third integrator for integrating a first differential signal output from said first subtracter; a reverser for reversing a third integrated signal output from said third integrator; and a comparator for comparing said first differential signal and said third integrated signal as reversed by said reverser, thereby generating said correction signal in correspondence with the result of comparison.