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System and method for on-chip filter tuning

  • US 6,865,381 B2
  • Filed: 03/17/2003
  • Issued: 03/08/2005
  • Est. Priority Date: 11/12/1998
  • Status: Expired due to Term
First Claim
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1. A method for tuning an actual filter using dummy filter in a receiver, comprising:

  • connecting an existing local oscillator (LO) signal to the dummy filter;

    stimulating the dummy filter with the existing LO signal;

    switching capacitors into the dummy filter until the center frequency of the dummy filter is that of the existing LO signal;

    determining capacitor values for the actual filter to tune a response of the actual filter to a designed center frequency, the step of determining based on the capacitors switched into the dummy filter;

    adding the capacitance values to the actual filter to center the response of the actual filter about the designed center frequency; and

    disconnecting the existing LO from the dummy filter.

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