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  1. #1
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    cadence gain

    Hi All,

    I would like to know the set up for measuring Gain and Phase plot for the charge pump PLL .I tried breaking the loop after the Divide by counter and giving a voltage source with VDC=0V and Vac=1V & tried to take measurements using spectre .But this did not work fine .could someone let me know the setup for plotting gain and phase plots .

    Thanks for your answer.

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  2. #2
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    cadence open loop gain

    openloop gain could use .dc to plot



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  3. #3
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    phase cadence spectre

    .dc for Open loop Gain ??



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  4. #4
    Advanced Member level 3
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    open loop gain of pll

    the best is to make a truthful model of your pll. Then it is easy to simulate the frequency responce. After that you can do a transient analysis of the actual schematic



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