Digital analog converter
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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Abstract
A PWM digital-to-analog converter is disclosed in which a value representing a differential between a first pulse width modulated waveform based upon input digital data and a second pulse width modulated waveform representing a 2'"'"'s complement version of the input digital data is produced by a differential amplifier and high frequency components thereof are attenuated to produce an analog output signal and with an improved distortion factor.
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Citations
5 Claims
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1. A digital-to-analog converter comprising:
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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, and filter means for attenuating high frequency components of said differential output waveform obtained from said differential amplifying means to produce an analog output signal. - View Dependent Claims (2, 3)
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4. A digital-to-analog converter comprising:
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input means for supplying input digital data, 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, lookup table memory means having an address input coupled with said input means to receive said input digital data for outputting stored values each in the form of a pulse width modulated waveform corresponding with a 2'"'"'s complement of said input digital data received at the address input thereof, differential amplifying means for producing a differential output waveform based upon said first waveform produced by said waveform generating means and said stored values output by said lookup table memory means, and filter means for attenuating high frequency components of said differential output waveform obtained from said differential amplifying means to produce an analog output signal. - View Dependent Claims (5)
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Specification