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Gain of a Charge Pump in Phase locked loop

ARWAH HAWRA

Hi,

I made a charge pump for 1GHz PFD up and down signal pulses. I am interested in finding out the gain of Charge Pump. Can anyone guide me the good reference or some idea about its procedure?

Thanks,

  • highspeedio
    here's one way:
    1. hook up the charge pump output to a zero impedance voltage source to set the Vctrl node.
    2. Sweep the input phase difference and run pss for each input phase.
    3. Average the output current over a pss period and divide it by the input phase error.
    4. You will get a Icp vs. phi curve. The linear slope around 0 defines the small signal gain, but of course, any nonlinearities also matter.

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