hi sarfaraz
for phase noise PM and stabiltiy
why dont u directly use the easy PLL option on
www.national.com
go to their wirelss section enter details of the PLL u are using and the VCO and specify the PM, PN etc
and it automaticaly gives you lopp filter components
HTH
-ashutosh
hi,
I am working on PLL frequency synthesizer.
Now I need to get the frequensy response of the whole system to find the phase margin and stabiltiy..
I can perform ac or stb analysis.
But I am not getting the correct output.
My concern is that is this due to the digital blocks (PFD and divider circuit),
or something else.
Can somebody suggest a better method.
My block is consisting of PFD, Charge Pump, 2nd order passive Loop Filter, VCOand a divide by 192 circuit.
Regards
Shaikh Sarfraz