Power supply rejection for pulse width modulated amplifiers...

Details Power supply rejection for pulse width modulated amplifiers... Power supply rejection for pulse width modulated amplifiers...

2006-11-13

2008-12-23

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S010000

Reexamination Certificate

active

07468632

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, either in conjunction with an amplifier or independently. 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.

REFERENCES:
patent: 6384678 (2002-05-01), Berkhout
patent: 6388514 (2002-05-01), King et al.
patent: 2005/0083115 (2005-04-01), Risbo

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