I am running a jitter simulation of a PFD.
I use the PSS and Pnoise in jitter mode.
Since the supply voltage is 1.2 V, the threshold crossing voltage is specified to 0.6V.
When I check the simuation result, I find Jee is too small (several tens of fs).
Then I check the threshold crossing in the direct plot form.
I find the crossing voltage is not what I've specified.The result is shown below:
My setting is:
PSS Beat frequency = 32.768kHzNumber of harmonics=7error preset=moderate
Pnoise sweep type=relative to 1sweep frequency from 100Hz to 16kHzMax sideband=7Threshold crossing=0.6
My MMSIM version is 7.2ISR7.
Could anybody help me to figure out this problem?Thanks