Hi, deal all:
I use the old version of spectre (ver 5.10.41), when I do a vco pss analysis , I found the spectre can't catch the frequency of the vco. For example , before the pss analysis a run a tran analysis. measure the freq=1.4617G(when the vco have reach the stable state);but in the following pss analysis the freq=1.47119G; so the pnoise analysis result is not right. I don't know why the pss analysis can't catch the right frequency, and I have try nearly all the option setting, but no usefull.Can anybody tell me something about this ?