Two point modulation digital phase locked loop

Two point modulation digital phase locked loop

  • CN 103,348,644 A
  • Filed: 02/08/2012
  • Published: 10/09/2013
  • Est. Priority Date: 02/08/2011
  • Status: Active Application
First Claim
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1. 2 modulation digital phase-locked loop circuits comprise:

  • The sampling clock input that can between a plurality of frequencies, switch;

    The sigma-delta modulator of the reception low pass modulating data in feedback path;

    Voltage mode D-A converter (VDAC), it receives the high pass modulating data;

    Analog vco, it is coupled to the output of described feedback path and described VDAC;

    AndPhase-to-digital converter (PDC), it is coupled to described feedback path, described sampling clock and loop filter.

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