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Temperature compensation for internal inductor resistance

  • US 6,504,420 B1
  • Filed: 11/12/1999
  • Issued: 01/07/2003
  • Est. Priority Date: 11/12/1998
  • Status: Expired due to Fees
First Claim
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1. An inductor Q compensation circuit comprising:

  • a first field effect transistor in series with a spiral inductor filter element;

    a dummy inductor;

    a constant current and voltage circuit;

    a second field effect transistor in series with the dummy inductor acting as a control element to maintain a constant voltage and current in the dummy inductor; and

    a differential amplifier having a first input coupled to a voltage reference generated by the constant current and voltage circuit, and a second input coupled to the dummy inductor;

    a Q of the spiral inductor filter element is maintained at a constant value by the first field effect transistor having a gate coupled to a gate of the second field effect transistor, the gate of the second field effect transistor coupled to an output of the differential amplifier.

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