Multi-stage amplifier with pulse width modulation (PWM) noise shaping
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United States of America Patent
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Nov 24, 2015
Grant Date -
Sep 3, 2015
app pub date -
Apr 29, 2015
filing date -
Apr 13, 2012
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Abstract
A pulse width modulation (PWM) amplifier includes a first amplifier stage, a second amplifier stage, and a gain module. The first amplifier stage is configured to amplify an analog input signal in the analog and digital domains using a first pulse width modulation (PWM) generator, to provide a first stage output for coupling to a load. The gain module is configured to amplify a quantization error of the first PWM generator by a predetermined gain. The second amplifier stage is configured to spectrally shape and attenuate the amplified quantization error of the first PWM generator using a second PWM generator, to provide a second stage output for coupling to the load.
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