Class D audio amplifier with PWM and feedback

Details Class D audio amplifier with PWM and feedback Class D audio amplifier with PWM and feedback

2006-03-07

2008-11-25

Choe, Henry K (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07456685

ABSTRACT:
The present invention introduces methods and systems to amplify digital audio signals for driving speakers. First, digital audio signals are converted to PWM audio signals by a liner PWM modulator that is open-loop. Then, PWM audio signals are amplified by a Class D audio amplifier that has at least one feedback loop.

REFERENCES:
patent: 6118336 (2000-09-01), Pullen et al.
patent: 6300825 (2001-10-01), Dijkmans et al.
patent: 6728368 (2004-04-01), Mohajeri
patent: 7239200 (2007-07-01), Ishii et al.
patent: 7262658 (2007-08-01), Ramaswamy et al.
patent: 7312654 (2007-12-01), Roeckner et al.

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