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Offset error compensation of input signals in analog-to-digital converter

  • US 6,433,712 B1
  • Filed: 07/25/2001
  • Issued: 08/13/2002
  • Est. Priority Date: 07/25/2001
  • Status: Active Grant
First Claim
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1. An analog-to-digital converter receiving an analog input signal including an offset component, the analog-to-digital converter comprising:

  • (a) a switched capacitor input circuit configured to sample the analog input signal to produce and store a signal representative of the sampled input signal between a first conductor and a second conductor;

    (b) a conversion circuit coupled to the first conductor and the switched capacitor input circuit and configured to produce a digital output signal representative of the analog input signal;

    (c) an offset correction circuit having an output coupled to the second conductor and an input receiving a digital offset correction signal, the offset correction circuit including a switched capacitor correction circuit operative in response to the offset correction control signal to transfer charge to/from the second conductor;

    (d) the conversion circuit being operative in response to adjustment by the offset correction circuit of a signal conducted by the first conductor to produce the digital output signal compensated for the offset component.

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