Chetana, Rfixture should be chosen according to the planned transmission line impedance that will load the buffer, nit the buffer's impedance. Arpad =============================================== ________________________________ From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On Behalf Of Chetana Raghuwanshi Sent: Monday, August 18, 2008 8:07 AM To: ibis-users@server.eda.org; ibis@server.eda.org Subject: [IBIS] Different PMOS and NMOS driver impedence Hello Experts, One of my IO cell has a buffer with different PMOS and NMOS impedences. PMOS impedence is approx 200 Ohms and that for NMOS is 96 Ohms. In this case what should be the value of Rfixture for calculating IV VT curves ? Would it be Rfixture1 for calculating pull down and falling waveforms and Rfixture2 for calculating pull up and rising waveforms ? If I do rise/pullup and fall/pulldown simulations with different Rfixture values, is it acceptable ? Best Regards Chetana -- 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 Mon Aug 18 06:11:59 2008
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