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DC offset correction system for a receiver with baseband gain control

  • US 20060222117A1
  • Filed: 04/04/2005
  • Published: 10/05/2006
  • Est. Priority Date: 04/04/2005
  • Status: Active Grant
First Claim
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1. A method in radio frequency (RF) receiver circuitry having a warmup period and a receive path associated therewith and including at least one baseband analog gain control stage having a gain and a baseband path associated therewith, the method comprising the step of performing a DC correction calculation operation during the warmup period to derive a DC correction value having a first component and a second component for each of the at least one gain control stage, wherein the step of performing a DC correction calculation operation during the warmup period comprises the steps of:

  • performing a first closed loop correction of the baseband path to derive a first component of the DC correction value; and

    performing a second closed loop correction of the receive path as a function of the gain during the warmup period to derive a second component of the DC correction value.

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