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Design >> RF Design >> Using S-parameter files in Spectre
https://designers-guide.org/forum/YaBB.pl?num=1169604168

Message started by chip on Jan 23^rd, 2007, 6:02pm

Title: Using S-parameter files in Spectre
Post by chip on Jan 23^rd, 2007, 6:02pm

When we use Spectre simulation for such as noise figure and phase noise, can we use S-parameter files? Or it can NOT and the passive devices such as inductors must be included as a physical-meaningful model?
Thanks a lot.

Title: Re: Using S-parameter files in Spectre
Post by ACWWong on Jan 24^th, 2007, 4:25am

Yes, this topic has been covered very recently on this forum. Try doing a search or try:

http://www.designers-guide.org/Forum/YaBB.pl?num=1169004722/3#3

Title: Re: Using S-parameter files in Spectre
Post by chip on Jan 24^th, 2007, 7:43am

Thank You Very Much ;D

Title: Re: Using S-parameter files in Spectre
Post by chip on Feb 2^nd, 2007, 12:32am

There is a problem when we use S-paramter file in Spectre simulation such as for phase noise and noise figure, because the simulator DO NOT know the "physical meaning" of the S-parameter--such as it does not know the impedance comes from a resistor of a inductance--for the later case, there is no noise from it. So for such kinds of simulations,we must use physical model in simulation. Yes?
Thanks

Title: Re: Using S-parameter files in Spectre
Post by pancho_hideboo on Feb 2^nd, 2007, 1:47am

Hi.

Touchstone format data have noise paramers as option.
However without this noise parameter option, S-parameter generates
thermal noise.

If you need additional noise other than thermal noise, you should add noise parameter.
This is true if your S-parameter boxes are some active device circuits.