Noise shaping for digital pulse-width modulators
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United States of America Patent
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Apr 21, 2015
Grant Date -
Jan 10, 2013
app pub date -
Sep 14, 2012
filing date -
Feb 3, 2010
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Abstract
A circuit including an analog-to-digital converter (ADC). The ADC is configured to receive an analog feedback signal and an analog input signal and generate a digital output. The circuit further includes a noise shaper. The noise shaper is configured to truncate the digital output and generate a noise shaper output having a lower number of bits than the digital output, and to shape quantization noise generated during truncation. The circuit further includes a pulse width modulation digital-to-analog converter (PWM DAC). The PWM DAC configured to process the truncated digital output of the noise shaper output and generate a PWM DAC output.
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