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Phase locked loop circuit

  • US 20050280453A1
  • Filed: 03/22/2005
  • Published: 12/22/2005
  • Est. Priority Date: 06/18/2004
  • Status: Abandoned Application
First Claim
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1. A phase locked loop circuit comprising:

  • a loop filter having a first input terminal and a second input terminal and comprising;

    a first capacitor coupled to the first terminal;

    a resistor having one terminal coupled to the first input terminal;

    a second capacitor coupled to the second input terminal; and

    a source follower having an input terminal coupled to the second input terminal and an output terminal coupled the other terminal of the resistor;

    a first charge pump coupled to the first input terminal outputting a first current; and

    a second charge pump coupled to the second input terminal outputting a second current;

    wherein the first current is a multiple of the second current.

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