Clock generation circuit and clock generation method

Clock generation circuit and clock generation method

  • CN 102,255,614 B
  • Filed: 05/20/2010
  • Issued: 04/19/2017
  • Est. Priority Date: 05/20/2010
  • Status: Active Grant
First Claim
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1. a kind of clock generating circuit, includes:

  • One phase detectors, for detecting phase contrast when one first between the seasonal pulse of normal pulse one second, to produce detection knotReally, the testing result includes a first phase signal and a second phase signal;

    One first filter, for carrying out low-pass filtering operation to the testing result;

    One charge pump, for producing a control signal according to the filtered testing result;

    One second filter, for rightThe control signal is filtered operation;

    AndOne controllable agitator, for producing an output seasonal pulse according to the filtered control signal, the wherein output seasonal pulseFor producing second seasonal pulse;

    Wherein first filter includes:

    One first wave filter, for being filtered operation to the first phase signal;

    AndOne second wave filter, for being filtered operation to the second phase signalWherein the charge pump includes:

    One first current source, one first end point is coupled to one first reference voltage;

    One first switch, with a control end points first wave filter is coupled to, and one first to be coupled to this with reference to end points first electricOne second end points in stream source, and one second refer to end points;

    One second current source, one first end point is coupled to one second reference voltage;

    AndOne second switch, with a control end points second wave filter is coupled to, and one first to be coupled to this with reference to end points second electricOne second end points in stream source, and one second couple this of the first switch and second refer to end points with reference to end points, to export thisControl signal;

    Wherein, first filter can'"'"'t change the produced total current within each cycle of the charge pump.

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