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Automatic IIP2 calibration architecture

  • US 7,742,747 B2
  • Filed: 01/25/2007
  • Issued: 06/22/2010
  • Est. Priority Date: 01/25/2007
  • Status: Active Grant
First Claim
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1. A second order intermodulation product (IIP2) calibration system for a wireless device comprising:

  • a test signal generator includinga transmitter core circuit including an oscillator circuit for generating a base frequency signal, anda test adaptor circuit for adding an offset signal corresponding to the second order tone to the base frequency signal, the test adaptor circuit generating the first RF signal in response to the base frequency signal;

    a receiver path having an input node for receiving the first RF signal, circuits for down-converting the first RF signal into a base band signal based on a receive frequency, and signal processing circuits for generating a digital data signal corresponding to the base band signal, the circuits receiving a compensation signal for minimizing the second order tone; and

    a calibration circuit for measuring said second order tone in said digital data signal and for generating the compensation signal.

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