Apparatus and method for a class D audio power amplifier...

Details Apparatus and method for a class D audio power amplifier... Apparatus and method for a class D audio power amplifier...

2007-01-30

2007-01-30

Choe, Henry (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

11043628

ABSTRACT:
A class D power amplifier is provided to drive a low impedance load for audio applications. The amplifier includes a sigma-delta modulator circuit including three or more integrators that are arranged for third or higher order sigma-delta modulation. Also, the sigma-delta modulator circuit includes a quantizer circuit that is arranged to provide a sigma-delta modulator output signal based on a three-level switching scheme. The class D power amplifier drives a speaker based on the three-level switching scheme so that the output switches between three levels: VDD, 0, and −VDD, based on the input signal.

REFERENCES:
patent: 5055843 (1991-10-01), Ferguson et al.
patent: 5886656 (1999-03-01), Feste et al.
patent: 5949361 (1999-09-01), Fischer et al.

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