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Hysteresis-free anti-saturation circuit

  • US 5,862,465 A
  • Filed: 12/30/1996
  • Issued: 01/19/1999
  • Est. Priority Date: 01/29/1996
  • Status: Expired due to Term
First Claim
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1. A method of preventing saturation in a receiver having a front-end section with a first variable-gain element, said front-end section receiving a high-frequency signal, amplifying said high-frequency signal, and converting said high-frequency signal to a lower-frequency signal, said receiver also having a back-end section for processing said lower-frequency signal, comprising the steps of:

  • generating from said lower-frequency signal an indicator signal indicating a power level of said lower-frequency signal;

    operating said first variable-gain element with a first gain when said indicator signal indicates that said power level is below a first threshold;

    operating said first variable-gain element with a second gain, lower than said first gain, when said indicator signal indicates that said power level is above a second threshold higher than said first threshold; and

    operating said first variable-gain element with at least one gain intermediate between said first gain and said second gain, when said indicator signal indicates that said power level is between said first threshold and said second threshold;

    whereinas said power level increases from said first threshold to said second threshold, the gain of said first variable-gain element decreases without hysteresis from said first gain to said second gain.

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