YCLO
Newbie level 2
Dear Sirs:
I use PSS and PNOISE to simulate the PFD/CP combined. I set up some phase difference between reference clock and feedback clock. I suppose to see the best phase noise occurs with zero phase difference and the larger phase difference, the worse phase noise characteristic. However, I saw a totally oppisite result. The worse phase noise occur while reference CLK and feedback CLK are locked. Anyone can explain this or point out what I did worng in my simulation setup? Thank you!!
YC
I use PSS and PNOISE to simulate the PFD/CP combined. I set up some phase difference between reference clock and feedback clock. I suppose to see the best phase noise occurs with zero phase difference and the larger phase difference, the worse phase noise characteristic. However, I saw a totally oppisite result. The worse phase noise occur while reference CLK and feedback CLK are locked. Anyone can explain this or point out what I did worng in my simulation setup? Thank you!!
YC