You can model it with two I-V curves. One which has the shape representing the pullup transistor, and another which has a shape representing your pulldown resistor. If the resistor is on constantly you can put its I-V curve in the ground clamp table. I would recommend that you read the IBIS cookbook to learn about the basics of IBIS modeling... http://www.vhdl.org/pub/ibis/cookbook/cookbook-v4.pdf Arpad ===================================================== ________________________________ From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On Behalf Of Gooi Han Chiou Sent: Thursday, October 18, 2007 7:54 PM To: ibis@server.eda-stds.org Subject: [IBIS] [Ibis] How to model an output buffer with internal pulldown resistor Hi all, I need to model an output buffer having transistor as pullup element, while a internal pulldown resistor as pulldown element, how should I model this type of buffer? -- Best Regards, Gooi Han Chiou -- This message has been scanned for viruses and dangerous content by MailScanner <http://www.mailscanner.info/> , and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Thu Oct 18 20:00:23 2007
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