Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-02-07
2008-10-14
Nguyen, Patricia (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000, C330S20700P
Reexamination Certificate
active
07436255
ABSTRACT:
Systems and methods for minimizing errors due to component variation in switching amplifiers utilizing power supply feed forward techniques. One embodiment comprises a digital PWM amplifier having an amplification subsystem for receiving a digital audio signal and producing an analog output signal. The amplifier includes a power supply feed-forward path configured to modify the digital audio signal based on a power supply measurement. The feed-forward path includes an analog filter configured to filter the power supply measurement, as well as correction circuitry configured to correct component mismatch errors introduced by the filter. The power supply measurement may be a power supply difference, a power supply common mode, or both. In either case, the power supply measurement is corrected by multiplying the measurement by an appropriately scaled power supply difference.
REFERENCES:
patent: 5559467 (1996-09-01), Smedley
patent: 6518838 (2003-02-01), Risbo
patent: 7078964 (2006-07-01), Risbo et al.
patent: 7109789 (2006-09-01), Spencer
patent: 2004/0028242 (2004-02-01), Kitamura
patent: 2007/0183490 (2007-08-01), Andersen et al.
Andersen Jack B.
Chieng Daniel L. W.
Kost Michael A.
D2Audio Corporation
Law Offices of Mark L. Berrier
Nguyen Patricia
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