Thanks Arpad! I have further questions, hope you don't mind. 1) Is this method of measuring differential current applicable to "receiver" with on-die termination? 2) How does simulators interpret the [Series Current] keyword? Do they automatically apply the series [Model] upon locating the [Series Pin Mapping] information when the pins are used? Which simulator currently supports this keyword? HSPICE? Hyperlynx? Thanks. Kong-Yew ________________________________ From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Muranyi, Arpad Sent: Monday, October 03, 2005 11:49 PM To: ibis-users@eda.org; ibis@eda.org Subject: [IBIS-Users] RE: [IBIS] Differential Buffer Modelling Kong-Yew, 1) You are correct. You would use Idiff and Vdiff for the table in [Series Current]. 2) You should use the same response (except with negative polarity) for the cancellation that you will use in your final model. If it was an [R Series], use a negative resistance, if it was [Series Current], use the same PWL table (with the signs reversed). I hope this helps. Arpad Muranyi Intel Corporation ======================================================================= ________________________________ From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Kong Yew Chan Sent: Monday, October 03, 2005 6:21 AM To: ibis-users@eda.org; ibis@eda.org Subject: [IBIS] Differential Buffer Modelling IBIS Gurus, I have some questions about generating differential buffer model as stated in latest Cookbook 4.0. 1) My normalized differential mode current has a similar plot as shown in Pg 36. It's a function of the differential voltage, so that makes the usage of keyword [Series Current] appropriate in this case. To fill the I-V table, am I supposed to use the Vdiff vs Idiff ? 2) For the V-T table data extraction, it was mentioned in Pg 40 that for [Series Current] keyword, PWL current source can be used to replace the R value. What should be the PWL response to represent the Idiff? (Idiff was only found to be a function of Vdiff from I-V extraction). Please advise if my assumptions are incorrect. Thanks Kong-Yew ----------------------------------------------------------------- |For help or to subscribe/unsubscribe, email majordomo@eda.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 email a request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993Received on Tue Oct 4 03:27:13 2005
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