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Dual-mode voltage controlled oscillator using integrated variable inductors

  • US 7,268,634 B2
  • Filed: 08/27/2004
  • Issued: 09/11/2007
  • Est. Priority Date: 08/27/2004
  • Status: Active Grant
First Claim
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1. A dual-mode voltage controlled oscillator including a dual-mode variable inductor comprising a transformer having a primary coil and a secondary coil, wherein a variable capacitance is provided in parallel to said secondary coil and a fixed capacitor or a variable capacitor is provided in parallel with the primary coil;

  • and a negative gm cell connected to said primary coil for cancellation of a loss in the variable inductor, wherein, by changing the variable capacitance in parallel with the secondary coil of the transformer, a resonant frequency of the dual-mode voltage controlled oscillator changes from a from a first frequency mode to a second frequency mode.

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