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Successive approximation analog-to-digital converter using balanced charge integrating amplifiers

  • US 5,793,322 A
  • Filed: 11/07/1996
  • Issued: 08/11/1998
  • Est. Priority Date: 11/07/1995
  • Status: Expired due to Term
First Claim
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1. An analog-to-digital converter comprising:

  • two signal inputs receiving two senses of a differential analog signal;

    a reference voltage input receiving and storing a reference voltage;

    a voltage to charge converter coupled to the signal and reference inputs generating differential and reference charges;

    first and second charge integrating circuits, coupled to the voltage to charge converter, receiving and storing input charges from the voltage to charge converter, and generating an output signal proportional to the stored charge;

    a comparator having two inputs respectively receiving outputs of said first and second charge integrating circuit and generating an output signal indicating which of said two inputs is larger;

    said charge integrating circuits subtracting a portion of the reference charge from the charge stored in the charge integrating circuit having the larger stored charge as determined by the comparator; and

    a register storing and outputting the results of a series of comparator outputs, each result representing a lesser significant new bit in an output digital word that represents the voltage of the differential analog signal.

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