Subject: RE: AC warning messages

From: "Beal, Weston" <[email-masked]>
Date: Thu, 19 Oct 2000 13:13:45 -0700

Kim,

This is definitely a problem. First of all, the model is bad and you need a
new one.

Tne scary thing is that most simulators will probably accept it and try to
run a simulation. Some simulators will even gloss over this problem and you
won't know. ICX would probably import the file, but it uses the actual
waveform data so your simulation results look crappy reflecting the bad
model.

Regards,
Weston

----Original Message-----
   >From:    	Kim Helliwell <[email-masked]>
   >To:        	[email-masked]
   >Cc:        	
   >Bcc:        	
   >Subject:    	AC warning messages
   >Type:    	IPM.Note
   >Date:    	Wednesday, October 18, 2000 6:59 PM
   >
   >When ibischk3 issues a warning like:
   >
   >WARNING - Model 'LVT162245_IO': TYP AC Rising Endpoints ( 0.01V,  2.45V)
not within 
   >          0.049V (2%) of ( 0.01V,  2.37V) on VI curves for 50 Ohms to 0V
   >
   >where do the expected limits (0.01V,  2.37V) come from?  The reason I
ask is
   >that I am getting a warning more like:
   >
   >WARNING - Model 'ECLout': TYP AC Rising Endpoints (-1.72V, -0.98V) not
within 
   >          0.015V (2%) of (-2.00V, -2.00V) on VI curves for 50 Ohms to
-2V
   >
   >where the upper and lower limits are the same, and that simply doesn't
make sense.
   >
   >Also: how serious a problem is this?  Do some or all simulators have
problems with
   >this sort of warning?
   >
   >
   >-- 
   >Kim Helliwell
   >Senior CAE Engineer
   >Acuson Corporation
   >Phone: 650 694 5030  FAX: 650 943 7260
   >