For those of you looking at designing fractional-N and interger-N style PLL circuits, ADI has released the latest version of ADIsimPLL.
Here in the link (http://forms.analog.com/form_pages/rfcomms/adisimp
This link has an intructional video and some presentations showing how to use this tool. I have used it before and have helped customers to use it. Very helpful clocking applications for high speed ADCs, DACs, and communications applications.
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