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Capacitive-degeneration double cross-coupled voltage-controlled oscillator

  • US 7,852,165 B2
  • Filed: 05/02/2008
  • Issued: 12/14/2010
  • Est. Priority Date: 11/27/2007
  • Status: Expired due to Fees
First Claim
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1. A voltage-controlled oscillator comprising:

  • a main cross-coupled oscillating unit including first and second transistors cross-coupled to first and second output nodes of a resonating unit to perform an oscillation operation; and

    an auxiliary cross-coupled oscillating unit including third and fourth transistors cross-coupled to the first and second output nodes and the first and second transistors and a degeneration capacitor connected between emitters of the first and second transistors so as to form a positive-feedback loop capable of increasing a negative resistance and decreasing an input capacitance by the positive-feedback loop,wherein the positive-feedback loop is contributed to by the first transistor, the fourth transistor, the degeneration capacitor, the third transistor and the second transistor,wherein the auxiliary cross-coupled oscillating unit comprises;

    the third transistor having a collector connected to the base of the first transistor and a base connected to the emitter of the second transistor;

    the fourth transistor having a collector connected to the base of the second transistor and a base connected to the emitter of the first transistor;

    the degeneration capacitor connected between emitters of the third and fourth transistors; and

    a first current source connected to emitters of the third and fourth transistors.

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