hello,
can any one tell me how to plot ISF, i know ali hajimirri paper but i followed same method like applying small current pulse and find the oscillator phase change and sweep this time instant. I am facing the following problems.

1. waveform looks like a distorted Square, so it is hard to define phase for times.

2. Still with the above problem, i have plotted but i didn't get decent waveform.

I would like to know how people plot in general and is there any function in cadence to do this...  

Thanks,
Raj.