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Clock jitter in class-D audio power amplifiers

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1 Author(s)
Berkhout, M. ; NXP Semicond., Nijmegen

Many class-D audio amplifiers use a reference clock to fix the PWM carrier frequency. The jitter of the reference clock can cause significant voltage noise at the amplifier output. In this paper a simple model is presented that allows accurate prediction of the noise contribution from an integrated regenerative sawtooth oscillator to the output noise of a class-D audio amplifier. The implementation of an oscillator in a class-D amplifier is presented and the model is verified with measurements.

Published in:
Solid State Circuits Conference, 2007. ESSCIRC 2007. 33rd European

Date of Conference: 11-13 Sept. 2007

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