Class-D audio amplifier with half-swing pulse-width-modulation

Details Class-D audio amplifier with half-swing pulse-width-modulation Class-D audio amplifier with half-swing pulse-width-modulation

2008-03-04

2008-03-04

Choe, Henry (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07339425

ABSTRACT:
An amplifier includes a first comparator, a second comparator, and an output switch. The first and second comparators respectively compare a pair of differential signals with a half-swing modulation signal to generate first and second pulse-width-modulation (PWM) control signals, wherein a voltage swing of the half-swing modulation signal is smaller than voltage swing of the differential signals. The output switch includes a pair of inputs coupled to receive the PWM control signals to provide a ternary encoded output signal in response to the PWM control signals.

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Definition of PMW Amplifier from Wikipedia, the free encyclopedia, http://en.wikipedia.org/wiki/Class—D—amplifier, (Feb. 2006) visited Mar. 3, 2006.
Sergio Sanchez Moreno, “Class D Audio Amplifiers - Theory and Design,” The Audio Pages, Elliott Sound Products, pp. 1-15, ( © Jun. 2005), http://sound.westhost.com/articles/pwm.htm, visited Mar. 3, 2006.

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