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Analog-to-digital and digital-to-analog converters and methods of operation

  • US 4,431,987 A
  • Filed: 02/25/1982
  • Issued: 02/14/1984
  • Est. Priority Date: 03/27/1980
  • Status: Expired due to Fees
First Claim
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1. A method for converting a non-binary digital word to an analog signal comprising the steps of:

  • repetitively generating a predetermined set of timing signals in response to clock signals received from an external source;

    decoding a received non-binary digital word to serially generate bit value signals having a first value when the received bit is high and a second value when the received bit is low;

    generating an initial feedback signal Vp having a predetermined value in response to only the first timing signal in each set of timing signals;

    generating a comparison signal Vc in response to said timing signals, a feedback signal Vp, a reference signal VR, and said bit value signals, said comparison signal having a value
    
    
    space="preserve" listing-type="equation">V.sub.c =(1-k)V.sub.p +kV.sub.r when said bit value signal has said first value, and generating said comparison signal Vc having a value
    
    
    space="preserve" listing-type="equation">V.sub.c =kV.sub.p when said bit value signal has said second value, wherein k has a predetermined value in the range of 0<

    k<

    1/2, and VR is a reference signal having a value equal to the full scale value of the analog signal;

    storing said comparison signal Vc to generate said feedback signal Vp for use in the generation of the next sequential comparison signal Vc ;

    repeating said steps of generating and storing said comparison signal in response to the remaining timing signals in said set of timing signals using the stored feedback signal Vp ; and

    outputting said comparison signal Vc in response to the last timing signal in each set of timing signals to generate an analog output signal having a value corresponding to the value of the received non-binary digital word.

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