High order correction for pulse width modulation (PWM) digital/analog converters with reduced computation
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United States of America Patent
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Aug 23, 2016
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app pub date -
Nov 19, 2015
filing date -
Nov 19, 2015
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Abstract
A delta sigma modulator (DSM) may be improved by configuring it to set the high-order nonlinear function values to zero when the quantization value being output is at its minimum or maximum value. In one embodiment, a DSM may include at least a quantizer having an input responsive to one of two state variables of the DSM and providing a feedback signal and a modulator output signal. The DSM may also include two mutually nonlinear function blocks, each applying a nonlinear function to the feedback from the quantizer, to form two mutually nonlinear feedback signals. At least one of the nonlinear functions applied by the function blocks may comprise a zero when the modulator output signal is a maximum modulator output signal capable of being output by the quantizer or when the modulator output signal is a minimum modulator output signal capable of being output by the quantizer.
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