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LOW NOISE AND LOW POWER VOLTAGE-CONTROLLED OSCILLATOR (VCO) USING TRANSCONDUCTANCE (gm) DEGENERATION

  • US 20150263671A1
  • Filed: 03/11/2014
  • Published: 09/17/2015
  • Est. Priority Date: 03/11/2014
  • Status: Active Grant
First Claim
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1. A voltage controlled oscillator (VCO), comprising:

  • a resonant tank circuit;

    an active negative transconductance circuit connected with the resonant tank circuit, comprising;

    cross-coupled transistors; and

    an impedance connected between the cross-coupled transistors and a reference voltage; and

    a bias current circuit for sourcing or sinking a bias current through the resonant tank circuit and the active negative transconductance circuit to generate an oscillating signal.

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