shaikhsarfraz
Full Member level 5
pll frequency response
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
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