Power supply rejection for pulse width modulated amplifiers and automatic gain control
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United States of America Patent
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Nov 14, 2006
Grant Date -
Aug 18, 2005
app pub date -
Jan 7, 2005
filing date -
Jan 7, 2004
priority date (Note) -
Expired
status (Latency Note)
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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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