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Communications receiver having adaptive dynamic range

  • US 6,556,635 B1
  • Filed: 11/09/1999
  • Issued: 04/29/2003
  • Est. Priority Date: 11/09/1999
  • Status: Expired due to Term
First Claim
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1. A communications receiver comprising:

  • an analog input for receiving an analog signal having a time-varying DC voltage drift;

    a variable gain amplifier, which is coupled to the analog input and is adapted to amplify the analog signal based on a gain set by a gain control input to the amplifier;

    an analog-to-digital (A/D) converter, which is coupled to an output of the amplifier and is adapted to convert the amplified analog signal to a series of digital values;

    a drift estimator coupled to the A/D converter, which generates an estimate of the time-varying DC voltage drift based on the series of digital values; and

    a gain adjuster coupled between the drift estimator and the amplifier, which adjusts the gain control input based on the drift estimate.

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