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Voltage controlled oscillator delay cell and method

  • US 8,120,408 B1
  • Filed: 07/14/2008
  • Issued: 02/21/2012
  • Est. Priority Date: 05/05/2005
  • Status: Active Grant
First Claim
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1. A delay cell circuit, comprising:

  • a differential stage coupled to receive a differential input voltage at first and second differential input terminals and provide a differential output voltage at first and second differential output terminals, the differential stage including a first variable current source that provides a differential stage current that decreases in response to a first control input; and

    a cross-coupled stage coupled to the differential output terminals and including a first gain attenuating resistor and a second variable current source, coupled to commonly coupled second terminals of the first and a second gain attenuating resistor, that provides a cross-coupled stage current that increases in response to the control input.

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