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Mixer gain calibration method and apparatus

  • US 6,983,135 B1
  • Filed: 11/11/2002
  • Issued: 01/03/2006
  • Est. Priority Date: 11/11/2002
  • Status: Expired due to Fees
First Claim
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1. A gain calibration circuit for a radio frequency (RF) mixer in a wireless transceiver, comprising:

  • a constant overdrive voltage generator that biases said mixer;

    a reference signal generator that generates a reference signal;

    a comparator that receives said reference signal and a second signal that is proportional to a mixer bias current flowing through said RF mixer and that generates a difference signal; and

    an adjustment circuit that adjusts a transconductance gain of said RF mixer based on said difference signal.

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