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tranfer charateritic of pfd

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manissri

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as i am very new for pll design
please tell me what is the transfer char of pfd and how it can be measured
regards
 

It it the relation between the average of UP-DN signals Vs the the input phase error.
It can be plotted by running multiple transient simulations , each time you change the delay between the input clocks.
each transient simulation shall be left for a long enough time , in order to get an acurate average.

Also The PFD has another C/Cs which is the average of UP-DN signals Vs the the input frequency error.
 

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