I can't find out any Design Issue in your post.
Please post to Simulator's Boards.
Mayank wrote on Dec 1st, 2009, 9:06pm:joebob wrote on Dec 1st, 2009, 4:36pm:Also, if anyone has used transient noise and have found it worthwhile,
what are your experiences and results?
My personal opinion --
If you are planning to do tran-noise run & then take a DFT for phse noise....
It takes a very very long time to do a transient noise run
(spectre stats on a quad-core 8GB server - around 1 day/1ms run)
-- not worthwhile
.....Just do a pss-pnoise instead....frequency domain simulator is much faster... I don't think so.
Transient Noise Analysis is mandatory rather than worthwhile especially for Delta-Sigma-ADC and PLL.
I don't think small signal noise analysis in frequency domain is useful for Delta-Sigma-ADC and PLL
because small signal noise never affects nonlineality which is a key role in Delta-Sigma-ADC and PLL.
Previously Cadence has claimed same opinion just as yours.
Cadence has strongly denied Transient Noise Analysis over long long time.
Instead Cadence advertised pnoise(type=timedomain) which is no more than small signal analysis in frequency domain and is very very limited regarding applicable circuits and behavioral models.
http://www.designers-guide.org/Forum/YaBB.pl?num=1258339986But Cadence is advertising Transient Noise Analysis intensively now.
This situation is also very true for HB Analysis, Convolution, Bsources and needs for multiple noise outputs ability, etc.
Cadence has strongly denied them over long long time.
About Transient Noise Analysis, I think performance of the following two simulators are superior than other simulators, of course far superior than Cadence Spectre.
- Berkeley Design Automation AFS Transient Noise Analysis
http://www.berkeley-da.com/prod/prod04_afs_tn.htm - Ansoft NEXXIM