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Gain step calibration in a mobile cellular transmitter

  • US 7,573,410 B1
  • Filed: 03/04/2008
  • Issued: 08/11/2009
  • Est. Priority Date: 03/04/2008
  • Status: Active Grant
First Claim
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1. A method comprising:

  • determining an operating gain level based on one of a plurality of analog gain steps that are used to adjust analog gain levels for an analog circuit;

    changing analog gain to adjust analog gain to another analog gain level for the analog circuit;

    setting digital gain to return gain level for the analog circuit back to the operating gain level, the operating gain level for the analog circuit now being controlled by digital gain steps of smaller incremental steps as compared to the analog gain steps, in order to utilize digital gain control with finer gain adjustment over analog gain adjustment; and

    calibrating digital gain at the operating gain level based on comparison with an analog gain measurement obtained at the operating gain level previous to changing the analog gain.

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