Programmable phase-locked loop circuitry for programmable logic device

Programmable phase-locked loop circuitry for programmable logic device

  • CN 1,610,261 B
  • Filed: 10/21/2004
  • Issued: 07/31/2013
  • Est. Priority Date: 10/21/2003
  • Status: Active Grant
First Claim
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1. phase-locked loop circuit that is used for programmable logic device, described phase-locked loop circuit has the input that is used to receive the input signal with reference frequency, and the output that is used to export the output signal with output frequency, and comprises:

  • Be used to produce the oscillator of described output signal;

    AndThe feed feedback path of described oscillator, described feedback path receives described input signal with described reference frequency and described output signal as input, and make described oscillator make described phase of output signal frequency lock in described input signal with described reference frequency, described feedback path comprises at least one element that is connected wherein, wherein;

    Another part that can be connected to one of at least described programmable logic device in described at least one element able to programmely, described one of at least co-operation that is used for described another part of described programmable logic device when described phase-locked loop circuit is not used in described programmable logic device and described at least one element, the part that described another part of described programmable logic device is not this phase-locked loop circuit.

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