Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2006-11-14
2006-11-14
Van Nguyen, Khanh (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S010000, C330S20700P
Reexamination Certificate
active
07135922
ABSTRACT:
A circuit according to the present invention improves the power supply rejection ratio for a pulse width modulated digital amplifier and can be used as a compressor and/or limiter. The circuit preferably operates by using voltage level translation to vary the amplitude of a triangle wave in response to changes in power supply voltage prior to input of the wave into a comparator of the PWM device. Because the circuit operates to improve power supply rejection, little or no distortion is introduced into the signal when used as a compressor and/or limiter. Additionally, the circuit is optionally implemented in a Class D amplifier, and provides a lower cost of implementation than conventional designs in such implementations.
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Altec Lansing Technologies Inc.
Greenberg & Traurig, LLP
Kurtz Richard E.
Landa Adam B.
Nguyen Khanh Van
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