Pulse width modulator and non-transitory computer readable medium for storing program for pulse width modulator
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United States of America Patent
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Aug 22, 2017
Grant Date -
May 25, 2017
app pub date -
Nov 3, 2016
filing date -
Nov 19, 2015
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Abstract
The pulse width modulator includes a subtraction unit configured to perform subtraction between an m value digital signal and a pulse width modulation signal; a feedforward filter unit configured such that a ΔΣ modulator to which an output signal of the subtraction unit is input and which includes integrators of a second order or higher is in cascade connection, and configured to operate with a sampling frequency FS; a product-sum computing unit configured to operate with a sampling frequency (FS/n) (n: an integer of two or more) to perform product-sum computing of an output signal of each integrator of the feedforward filter unit; and a pulse width modulation unit configured to operate with the sampling frequency (FS/n) to perform pulse width modulation of an output signal of the product-sum computing unit to output a pulse width modulation signal.
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