Class-D power amplifier having distortion-suppressing function

Details Class-D power amplifier having distortion-suppressing function Class-D power amplifier having distortion-suppressing function

2009-08-21

2010-12-14

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S010000, C330S149000, C330S20700P

Reexamination Certificate

active

07852156

ABSTRACT:
A Class-D power amplifier having a distortion-suppressing function includes a gain control unit, a first PWM unit, a second PWM unit, a current control unit, and a level control unit. The level control unit includes at least one D flip-flop and at least one XNOR gate. The D flip-flop has an output end coupled with the gain control unit and an R end coupled with an output end of the XNOR gate. When the Class-D power amplifier has its positive output end and negative output end respectively and simultaneously outputting a high-level signal and a low-level signal to the XNOR gate, the XNOR gate outputs the high-level signal to the D flip-flop. Then the D flip-flop outputs the high-level signal to the gain control unit as feedback for controlling the gain control unit to reduce audio gain, thereby suppressing audio distortion.

REFERENCES:
patent: 6853242 (2005-02-01), Melanson et al.
patent: 7142050 (2006-11-01), Risbo
patent: 7279967 (2007-10-01), Quilter
patent: 7348840 (2008-03-01), Magrath et al.
patent: 7456686 (2008-11-01), Nadd
patent: 7474149 (2009-01-01), Snelgrove et al.
patent: 7554390 (2009-06-01), Shankar et al.

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