RE: [IBIS-Users] re: Warning message for IO_open_drain model

From: Tom Dagostino <tom_at_.....>
Date: Thu Oct 25 2007 - 09:21:27 PDT
An open drain buffer had a FET whose source is tied to "ground". The drain
connection is brought to the outside of the IC package where a load is
connected.  If the load is connected between the drain and the ground (your
message says Vref=0V) then there is no current allowed to flow in the FET.
Try moving Vref to Vdd and it should solve your problem.

 

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827 

From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org] On Behalf Of Ibis Model
Sent: Wednesday, October 24, 2007 11:04 PM
To: Server EDA
Subject: [IBIS-Users] re: Warning message for IO_open_drain model

 

Hi everyone,

 

I get a warning message "TYP VI curves cannot drive through Vmeas given load
Rref=1e+006 Ohms to Vref=0V" for IO_open_drain model. 

 

What does this message mean ? 

 

Regards,

Timmy

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Received on Thu Oct 25 09:24:19 2007

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