Digital-to-analog converter using pulse-width modulation
First Claim
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1. A digital-to-analog converter for converting input digital data having a predetermined sampling period into an analog signal, comprising:
- pulse-width modulated signal generation means for generating a pulse-width modulated signal having a pulse width corresponding to said input digital data; and
low-pass filter means for eliminating high-frequency components of said pulse-width modulated signal to thereby output said analog signal;
whereinsaid pulse-width modulated signal generation means is operative to divide the sampling period of said input digital data into an integral even number of divided sampling periods and to generate a pulse-width modulated signal in each divided sampling period, said sampling period including at least two pulses having equal pulse widths symmetrically arranged about a point a predetermined interval from the center of said sampling period and corresponding to said input digital data.
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Abstract
A digital-to-analog converter utilizing a PWM system for converting input digital data to PWM signals and finally to an analog signal divides the sampling period of the input digital data into an even number of sampling periods and produces PWM signals with equal pulse widths corresponding to the input digital data each divided sampling period, whereby a simple structure is provided to reduce harmonic distortion and obtain a high quality analog signal.
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4 Claims
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1. A digital-to-analog converter for converting input digital data having a predetermined sampling period into an analog signal, comprising:
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pulse-width modulated signal generation means for generating a pulse-width modulated signal having a pulse width corresponding to said input digital data; and low-pass filter means for eliminating high-frequency components of said pulse-width modulated signal to thereby output said analog signal;
whereinsaid pulse-width modulated signal generation means is operative to divide the sampling period of said input digital data into an integral even number of divided sampling periods and to generate a pulse-width modulated signal in each divided sampling period, said sampling period including at least two pulses having equal pulse widths symmetrically arranged about a point a predetermined interval from the center of said sampling period and corresponding to said input digital data. - View Dependent Claims (2, 3, 4)
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Specification