Hi Lars, usually in IBIS modeling I refer to the typ, min and max PVT cases as to the nominal, slow and fast PVT cases. In max (fast) PVT cases usually one should have the best transistor device parameters ("fastest" transistors), highest voltage and - now comes the trick (if there is one at all) - lowest temperature for CMOS circuits (since CMOS transistors usually have negative temperature coefficient - meaning lower temperature yields in higher current --> faster switching) or highest temperature for bipolar transistors (devices) since usually they have positive temperature coefficient and therefore at higher temperatures they deliver higher current (in some cases some smoke as well :-)) Similar (but opposite) in slow PVT case: put there slowest device models, lowest voltage and highest temperature for CMOS or lowest temperature for bipolar devices. Of course, I can imagine that in some very special cases some deviations from above rules could happened. So, if you are having IBIS models of some vendor that uses both CMOS and bipolar technologies having different temperatures for the same PVT case I would say that it makes sense - if that is not the case, I would than directly clarify with the model provider if there is a bug in the model or not. I hope this helps. Best regards / Mit freundlichen Grüßen / S po¹tovanjem Radovan Vuletiæ Staff Engineer Product Development Qimonda AG QAG PX D PDE MUC/10.2.236 AP 3 Am Campeon 1-12 D-85579 Neuebiberg Germany Phone: +49 (0)89 60088 1233 Fax (PC): +49 (0)89 60088 45 5305 Mobile: +49 (0)160 7476262 E-mail: radovan.vuletic@qimonda.com Web: http://www.qimonda.com/ ============================================================================== Qimonda AG Chairman of the Supervisory Board/ Aufsichtsratsvorsitzender: Peter J. Fischl Management Board/ Vorstand: Kin Wah Loh (Chairman/ Vorsitzender), Thomas J. Seifert Register Court/ Registergericht: München HRB 152545, Seat/ Sitz: München ============================================================================== -----Original Message----- From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Lars Snith Sent: Monday, March 23, 2009 1:27 PM To: ibis-users@server.eda.org Subject: [IBIS-Users] Correct use of [Temperature Range] Hello Friends, Let me once and for all try to nail down an issue that seem to be a constant source of confusion. The IBIS model syntax defines the triplet order [typ] [min] [max]. But this relates to the overall case, not the individual parameter, right? So to make things match the real operational case the [min] of [Temperature Range] would really need to be the maximum temperature, right? Looking at what others do is not much help here, I see examples of both variants, frequently from the same vendor(!). So an authorative answer would be appreciated. Best regards, Lars Snith -- Those who can, Do Those who can't, Simulate -- 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 email was Anti Virus checked by Astaro Security Gateway. http://www.astaro.com -- 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 Mar 23 06:15:48 2009
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