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