Class D audio amplifier

Details Class D audio amplifier Class D audio amplifier

2008-03-17

2009-12-08

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

07629842

ABSTRACT:
A class D audio amplifier includes an error amplifier, a comparator, a bridge circuit, a feedback circuit and a silent start circuit. The error amplifier generates an error signal by amplifying a difference between a feedback signal and an audio input signal. The comparator generates a first pulse width modulation (PWM) signal by comparing a first triangular-wave signal and the error signal. The bridge circuit has switches alternately conducting a current flowing into and from a load. The feedback circuit generates the feedback signal indicating a condition of the load. The silent start circuit performs AND operation of the first PWM signal and a second PWM signal having a gradually increased duty ratio to generate a third PWM signal for control of the switches of the bridge circuit.

REFERENCES:
patent: 5973368 (1999-10-01), Pearce et al.

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