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Frequency acquisition rate control in phase lock loop circuits

  • US 6,704,381 B1
  • Filed: 09/17/1999
  • Issued: 03/09/2004
  • Est. Priority Date: 09/17/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a first circuit configured to generate (i) a first reference signal in response to a pump-up signal and (ii) a second reference signal in response to a pump-down signal; and

    a second circuit configured to generate (a) a first control signal in response to (i) said pump-up signal and (ii) said second reference signal and (b) a second control signal in response to (i) said pump-down signal and (ii) said first reference signal.

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