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Bandpass filter with tunable resonator

  • US 7,174,147 B2
  • Filed: 02/16/2005
  • Issued: 02/06/2007
  • Est. Priority Date: 04/11/2001
  • Status: Expired due to Term
First Claim
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1. A tunable bandpass filter comprising:

  • a first ferroelectric (FE) tank circuit comprising;

    a first node to accept an input signal;

    a first resonator having a first resonator input connected to the first node and a first resonator output connected to a reference voltage; and

    a second capacitor having a second capacitor input connected to the first node, a second capacitor output connected to the reference voltage, and a control signal input to accept a control signal, the second capacitor comprising an FE material with a dielectric constant responsive to the control signal;

    a second FE tank circuit comprising;

    a second node to supply a bandpass filtered signal;

    a second resonator having a second resonator input connected to the second node and a second resonator output connected to the reference voltage; and

    a third capacitor having a third capacitor input connected to the second node, a third capacitor output connected to the reference voltage, and a second control signal input to accept a second control signal, the third capacitor comprising a second FE material with a second dielectric constant responsive to the second control signal; and

    a first capacitor connected in series between the first node and the second node.

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