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Error in ADS - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Noise
Post subject: Error in ADS Posted: Tue May 02, 2006 5:05 am

Captain


Joined: Tue May 02, 2006 4:59 am
Posts: 15
I use the Budget tool and got that error message :

[b]Error detected by HPEESOFSIM during Budget Analysis `Budget'.
Term3: ERROR: During Budget cascaded noise analysis; possible element with
unrealistic S-parameters; look for |S11| > .8; |S22| > .8; |S12| near, equal
or greater than |S21|. [/b]

Maybe anyone understand it ?
I know its depend on the attenuators location but im not understand why .


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fred47
Post subject: ADS error messagePosted: Tue May 02, 2006 6:32 pm

General


Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
Hi!
That's actually a more-helpful error message than many, because it tells you what to look for in your design. Unfortunately it's not very specific - it doesn't tell you where to look, and it gives 3 alternatives.

The S11 and S22 checks say that maybe there's a severe impedance mismatch between two stages, the S12/S21 message says that maybe there's a large amount of (unexpected/undesired) feedback around an active stage.

Good Luck!


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IR
Post subject: Posted: Tue May 02, 2006 10:03 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello

I took the initiative and replied to this post directly by email as we had already a brief correspondence in the past. I mentioned that the main cause of such a problem is instability (As fred47 mentioned), this is also noticed by the values of S11, S22 which are greater than 1. This is likely to be caused by poor matching. I also suggest you to do the budget analysis simulation step by step from the start: Block after block. And to see in which step the error message displays. By doing that you can find out the problemtaic element and check it separately.

Good luck!

_________________
Best regards,

- IR


Posted  11/12/2012

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