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Digital analog converter

  • US 5,021,788 A
  • Filed: 02/13/1990
  • Issued: 06/04/1991
  • Est. Priority Date: 02/14/1989
  • Status: Expired due to Term
First Claim
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1. A digital-to-analog converter comprising:

  • input means for supplying input digital data,first waveform generating means coupled with the input means to receive said input digital data for generating a first pulse width modulated waveform corresponding with said input digital data,second waveform generating means coupled with the input means to receive said input digital data for generating a second pulse width modulated waveform corresponding with a 2'"'"'s complement version of said input digital data,first low pass filter means for attenuating high frequency components of said first waveform to produce a first filtered waveform,second low pass filter means for attenuating high frequency components of said second waveform to produce a second filtered waveform,differential amplifying means coupled with the first low pass filter means to receive the first filtered waveform therefrom and with the second low pass filter means to receive the second filtered waveform therefrom, for producing a differential output waveform based upon said first filtered waveform and said second filtered waveform, andfilter means for attenuating high frequency components of said differential output waveform obtained from said differential amplifying means to produce an analog output signal.

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