Patent ID: 9654069
Date: 2017-05-16
CPC Classifications: H03F,H04R

Claim:
1. A class D amplifier, comprising: two or more pulse width modulator comparators that receive a respective channel of audio signals, and compare each of the received respective channel of audio signals with respective triangle wave signals and generate respective pulse width modulated signals for each of the received channels of audio signals; two or more switching stage amplifiers that receive the two or more pulse width modulated signals and amplifying each respectively according to a predetermined gain based on a channel identity of the received audio channel; two or more filter stages that filter each of the two or more amplified pulse width modulated signals; two or more speakers that receive a respective one of the two or more filtered amplified pulse width modulated signals; and a triangle wave generator that generates the triangle wave signals, the triangle wave generator including a DC servo circuit, the DC servo circuit comprising the output of the first amplifier is connected to a current adjusting input of a first current source, monitors a first DC voltage on the triangle wave, and provides a second, oppositely polarized DC voltage to counteract the first DC voltage on the triangle wave,