Raghavendra, The common mode current goes into the normal [Model]'s I-V tables, and the differential current goes into the series model that is placed between the two [Model]-s. You can further separate the clamp currents from the PU and PD I-V curves in the [Model] by redoing the same measurements in a 3-stated mode. (But don't forget to put the difference of the clamp and driven I-V curves into the PU and PD tables, instead of the total current to avoid double counting). I am not aware of a tool that can do all this in an automated way. Arpad ======================================================= -----Original Message----- From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Raghavendra M Sent: Thursday, September 10, 2009 12:17 AM To: ibis-users@server.eda.org Subject: [IBIS-Users] differential receiver ibis model Hi, I have a fully differential receiver in a chip, am trying to make an ibis model for this receiver Can you describe the method how to generate an ibis v3 model for the differential receiver I read the ibis cookbook and it says that for a differential buffer with positive and negative inputs, one input should be swept keeping the other input constant(negative) and record the currents into both inputs. Now change the constant input to new value and sweep the positive input and record the currents. This process should be continued as the negative input is swept in steps through the same range as positive input. From the current recorded we have to separate common mode and differential mode currents. But my question is where should we keep this common mode and differential mode currents in the ibis file? Actually for receiver, only clamp data should be kept in ibis file, so in [Power clamp] data where should we keep common mode current and differential mode current Should i use series model for my differential receiver? Should we place these characteristics in the model series? Is there any tool to generate an ibis model for differential receiver directly? Thanks & Regards Raghavendra M -- 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 1993 -- 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 Sep 10 06:29:44 2009
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