Audio power amplifier and a pre-amplifier thereof

Details Audio power amplifier and a pre-amplifier thereof Audio power amplifier and a pre-amplifier thereof

2011-07-05

2011-07-05

Pascal, Robert (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

Reexamination Certificate

active

07973598

ABSTRACT:
An audio power amplifier includes a pre-amplifier, an error amplifier, a comparator, a bridge circuit, and a feedback circuit, in which the gain of the pre-amplifier gradually increases when the audio power amplifier is powered on. The comparator generates a PWM signal by comparing a reference signal and an amplified audio signal. The bridge circuit has switches controlled according to the PWM signal such that a driving current alternately flows to and from a load. The feedback circuit generates the feedback signal indicating a condition of the load.

REFERENCES:
patent: 6118336 (2000-09-01), Pullen et al.
patent: 7352238 (2008-04-01), Elwan et al.
patent: 7456686 (2008-11-01), Nadd
patent: 2009/0102550 (2009-04-01), Ohama et al.

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