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What are the types of PFD in PLL?

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icfb

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how many types PFD?
anybody can tell me more types PFD and how they work?
thanks!

And how to sim the phase noise of the PFD?

thanks a lot!
 

Re: about PFD in PLL

hello,
i didnt see any types except for the simple AND and two FF's yet there are diffrent methodes to implement the AND and FF's ,i saw some gate combination that just decrease the number of gates for making the simple PFD
Note: obviously this uses lower number of gates than making two D-FF's and an AND
of course this also complicats the used gates like the 4 input NAND
 

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