Apparatus and method for phase lock loop gain control using unit current sources

  • US 7,355,485 B2
  • Filed: 03/31/2005
  • Issued: 04/08/2008
  • Est. Priority Date: 03/20/2001
  • Status: Expired due to Term
First Claim
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1. A method of compensating the gain of a phase lock loop (PLL), comprising:

  • receiving a first control signal that is representative of an output frequency of said PLL;

    receiving a second control signal that is representative of a characteristic of said PLL; and

    generating a charge pump current for said PLL based on said first control signal and said second control signal,wherein said generating comprises;

    selecting a charge pump current value from a plurality of charge pump current values based on said first control signal and said second control signal, andconverting said selected charge pump current value from a digital value to analog.

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