Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
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Error in ADS - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: Error in ADS Posted: Tue May 02, 2006 5:05 am
Joined: Tue May 02, 2006 4:59 am
I use the Budget tool and got that error message :
detected by HPEESOFSIM during Budget Analysis `Budget'.
During Budget cascaded noise analysis; possible element with
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
Post subject: ADS error messagePosted:
Tue May 02, 2006 6:32 pm
Joined: Wed Feb
22, 2006 3:51 pm
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.
Post subject: Posted: Tue May 02, 2006 10:03 pm
Joined: Mon Jun 27, 2005 2:02 pm
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.