Recovery from clipping events in a class D amplifier

Details Recovery from clipping events in a class D amplifier Recovery from clipping events in a class D amplifier

2008-09-16

2008-09-16

Nguyen, Patricia (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S20700P

Reexamination Certificate

active

11556634

ABSTRACT:
A class AD audio amplifier system (10) with improved recovery from clipping events is disclosed. The amplifier system (10) includes multiple audio channels (20), each of which can be constructed to include a pulse-width-modulator (PWM) (24). The PWM modulator (24) includes a pair of comparators (39A,39B;52+, 52−) that generate complementary PWM output signals based upon the comparison between a filtered difference signal and a reference waveform. Clip detection logic (26) is provided to detect clipping at the output of the channel (20), preferably by detecting successive edges of the reference waveform without an intervening edge of a PWM output signal. In response to detecting clipping, a first integrator (30; 45) is reset to remove residuals and to eliminate the first integrator (30; 45) from the loop filter of the modulator (24). A saturation level circuit (35) applies a clamping voltage, preferably in both clipping and non-clipping situations, to a second integrator (36; 47). As a result, the loop filter is prevented from entering extreme conditions during clipping, which greatly reduces the clipping recovery time.

REFERENCES:
patent: 4724396 (1988-02-01), Taylor et al.
patent: 5157727 (1992-10-01), Schloss
patent: 5216376 (1993-06-01), Swanson
patent: 5594386 (1997-01-01), Dhuyvetter
patent: 7088177 (2006-08-01), Lind
patent: 7315202 (2008-01-01), Tsuji

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