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Temperature compensation for internal inductor resistance

  • US 8,111,095 B2
  • Filed: 09/18/2006
  • Issued: 02/07/2012
  • Est. Priority Date: 11/12/1998
  • Status: Expired due to Fees
First Claim
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1. A system for controlling temperature-induced quality variation in a first filter disposed within a signal path, the system comprising:

  • a second filter, disposed outside of the signal path, having an inductor, wherein a resistance of the inductor is temperature-dependent;

    a variable resistor, controlled based upon the temperature-dependent resistance of the inductor in the second filter, coupled in series with the first filter disposed within the signal path; and

    a control circuit, coupled to the second filter, configured to produce a control signal corresponding to the temperature-dependent resistance of the inductor in the second filter, wherein the control circuit is configured to control, with the control signal, a resistance of the variable resistor.

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