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Calibration for a tunable RF filter structure

  • US 9,780,756 B2
  • Filed: 08/01/2014
  • Issued: 10/03/2017
  • Est. Priority Date: 08/01/2013
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) front-end circuitry, comprising:

  • a tunable RF filter structure comprising a pair of weakly coupled resonators, wherein the tunable RF filter structure is tunable to define a transfer function with a passband;

    a calibration circuit comprising a replica resonator and configured to;

    shape the passband so that the passband defines a center frequency near a target center frequency using the replica resonator;

    detect a phase difference between the pair of weakly coupled resonators at the target center frequency; and

    adjust the phase difference between the pair of weakly coupled resonators at the target center frequency so as to reduce a frequency displacement between the center frequency of the passband and the target center frequency.

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