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Simulators >> RF Simulators >> help on repeating simple t/h example in SpectreRF
https://designers-guide.org/forum/YaBB.pl?num=1151479904

Message started by LL on Jun 28^th, 2006, 12:31am

Title: help on repeating simple t/h example in SpectreRF
Post by LL on Jun 28^th, 2006, 12:31am

Hi -
I'm new to spectreRF and find the article "Simulating Switched-Capacitor Filters with SpectreRF" (under Anaysis/Analog SImulation) extremely informative. However, I'm having a difficult time repeating the figures for just a simple t/h simulation. If you were able to repeat that successfuly, I would be very much interested to know how you did it. Perhaps, Ken can also provide some hints on how you generated those plots for the article.

thanks,
LL

Title: Re: help on repeating simple t/h example in Spectr
Post by Ken Kundert on Jul 20^th, 2006, 9:36am

Perhaps you can be more specific? For example, which figures are you trying to recreate?

Have you tried downloading the netlists and starting from there?

-Ken

Title: Re: help on repeating simple t/h example in Spectr
Post by LL on Jul 26^th, 2006, 11:05pm

Hi Ken,
Thank yuo for your reply. Yes I did download the netlist but still wasn't able to repeat the plots in the doc. BTW, the netlist as is doesn't run. I made some mod before I was able to get the sim to run.

I see that dwingram is asking the same thing I after. Your reply to his post will defintely clear up my inquiry as well.

I will wait for your reply. Many thanks in advance.

Title: Re: help on repeating simple t/h example in Spectr
Post by Andrew Beckett on Jul 27^th, 2006, 10:05pm

Really? Did you supply the -E argument to spectre (it gives you an error if you don't, since this example uses cpp directives).

I just re-tried both netlists, and can run with:

Code:

spectre -E tah.ckt
spectre -E scf.ckt

Regards,

Andrew.

Title: Re: help on repeating simple t/h example in Spectr
Post by LL on Jul 27^th, 2006, 11:54pm

HI Andrew,

Thank you for your reply. Yes, the -E corrected the error. Does your pxf result look close to fig 8 in the doc?

Title: Re: help on repeating simple t/h example in Spectr
Post by Ken Kundert on Jul 28^th, 2006, 4:48pm

There was an error in the paper. To get the results shown in Fig 8, the PXF analysis must use the node 'sout' rather than the node 'out'. I have updated the paper and the netlists.

-Ken

Title: Re: help on repeating simple t/h example in Spectr
Post by LL on Jul 29^th, 2006, 10:32am

Thank you very much Ken (and Andrew as well) for your help.