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question about VCO simulation in Cadence - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


yzs
Post subject: question about VCO simulation in Cadence
Unread postPosted: Tue Mar 15, 2005 1:23 pm

i just simulate a very basic LC cross-coupled VCO in Cadence.
trans analysis.

It's weird to me that the results is subjective to simulation time.
say when simulate 20ns, I can see the oscillation wave, while if i change to 10ns or 30ns, the wave is gone and seems not oscillate at all.

And, the Oscillation start time point is varies with the simulation time as well.

Why is that? Is this related to simulation time step?

simulator used is specture. 0.18 RFCMOS

thanks for reply







Posted  11/12/2012

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