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Method for reducing static phase offset in a PLL

  • US 6,172,571 B1
  • Filed: 03/24/1999
  • Issued: 01/09/2001
  • Est. Priority Date: 07/28/1998
  • Status: Expired due to Term
First Claim
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1. An architecture comprising:

  • a) a first chase frequency detector that outputs a first active operating signal in response to one or more reference signals;

    b) a first charge pump circuit configured to provide a replica pump signal in response to (I) a current adjustment signal and (II) either (i) at least one of said one or more reference signals or (ii) said first active operating signal;

    c) a second charge pump circuit configured to provide a voltage control signal in response to said current adjustment signal and either said first active operating signal or a second, independent active operating signal; and

    d) a comparator configured to provide said current adjustment signal in response to said replica pump signal and said voltage control signal.

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