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Telecommunications receiver with automatic gain control

  • US 7,565,125 B2
  • Filed: 06/23/2003
  • Issued: 07/21/2009
  • Est. Priority Date: 12/18/2002
  • Status: Active Grant
First Claim
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1. A receiver comprising:

  • analog-to-digital circuitry for generating a digital representation, comprising a bit signal, of an amplified analog signal at an input;

    adjustable gain control circuitry for receiving a radio signal and outputting the amplified analog signal using a gain determined by a magnitude of the amplified analog signal, the gain being connected directly to the bit signal at an output of the analog-to-digital circuitry;

    digital channel filtering circuitry for filtering said digital representation; and

    digital processing circuitry for processing the output of said digital channel filtering circuitry,wherein the gain is adjusted by a first amount responsive to a first bit selected from a predetermined plurality of most significant bits in the bit signal, the first bit indicating that the output of the analog-to-digital circuitry has exceeded a first saturation threshold,wherein the gain is adjusted by a second amount responsive to a first set of bits selected from the predetermined plurality of most significant bits in the bit signal, the first set of bits indicating that the output of the analog-to-digital circuitry has exceeded a second saturation threshold,wherein the first amount is not equal to the second amount, andwherein the first saturation threshold is not equal to the second saturation threshold.

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