US 9,742,381 B2 · Pulse width modulator and non-transitory computer readable medium for storing program for pulse width modulator

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.

Claims4

Dependent claims

A pulse width modulator for converting an m value digital signal, where m indicates an integer of three or more, into a pulse width modulation signal of two or more values, comprising:

a subtraction unit configured to perform subtraction between the m value digital signal and the 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), where n indicates 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.

4 more elements

A non-transitory computer readable medium for storing a program for causing a computer to execute signal processing for converting an m value digital signal, where m indicates an integer of three or more, into a pulse width modulation signal of two or more values,

wherein the program causes a processor of the computer to execute
a step of executing signal processing for performing subtraction between the m value digital signal and the pulse width modulation signal,
a step of executing signal processing of a feedforward filter unit configured such that a ΔΣ modulator to which a subtracted output signal 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 step of executing signal processing of a product-sum computing unit configured to operate with a sampling frequency (FS/n), where n is 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 step of executing signal processing for performing, by operation with the sampling frequency (FS/n), pulse width modulation of an output signal of the product-sum computing unit to output a pulse width modulation signal.

2 more elements

Dependencies are inferred from the claim text.

Pulse width modulator and non-transitory computer readable medium for storing program for pulse width modulator

Life of this patent

Pulse width modulator and non-transitory computer readable medium for storing program for pulse width modulator

Life of this patent

Abstract

Claims4