Hello Mike n Experts, Regarding the direction of current, you have mentioned that " currents into pin 2 would be negative. It should not be necessary.". For which condition, above convention would not be valid?? Also, For any positive voltage in V-I table of [Series Current] ( i.e., voltage of pin 1 is greater than pin2 ) , current will come out from pin 1 and will go into pin 2 and from Defined convention of [Series keyword], sign of current will be negative. Similarly, for negative voltage, current will be positive. But, example given under keyword [Series Current] in IBIS ver5.0 specification document shows negative current for negative voltage. Am I interpreting the "current direction convention" wrongly or there is some discrepancy in SPECIFICATION document?? Regards PRABHAT From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On Behalf Of Mike LaBonte (milabont) Sent: Monday, September 14, 2009 6:32 PM To: Edward Rose; ibis-users@server.eda.org; ibis@server.eda.org Subject: [IBIS] RE: [IBIS-Users] Usage of [Series Current] The series models below do appear to be equivalent. Voltage on series models is measured from pin 1 to pin 2 of the [Series Pin Mapping] entry, and currents into pin 2 would be negative. It should not be necessary, but it may help to extend the table voltage range all the way from -1.2V to +2.4V. In my opinion it is quite likely that there could be issues with some [Series Current] implementations, and the various tools may behave differently. If you are an IC vendor you could submit your IBIS file to the free model review service, where it will be examined and tested by EDA tool vendors and other experts. http://www.eigroup.org/ibis/support.htm Or you could report the problem to the vendor you are using. Mike _____ From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Edward Rose Sent: Monday, September 14, 2009 6:27 AM To: ibis-users@server.eda.org; ibis@server.eda.org Subject: [IBIS-Users] Usage of [Series Current] Hello Experts, I am trying to use [Series Current] keyword instead of [R series] in a Series model as given below. |********************************************************************** [Model] SER_RES Model_type Series Polarity Non-Inverting Enable Active-High C_comp 0pF 0pF 0pF | | typ min max [Voltage Range] 1.2V 1.08V 1.32V | | variable R(typ) R(min) R(max) | |[R Series] 100ohm NA NA | [End] |********************************************************************** | [Model] SER_CURR Model_type Series Polarity Non-Inverting |Enable Active-High C_comp 0pF 0pF 0pF | | typ min max [Voltage Range] 1.2V 1.08V 1.32V | [Series Current] | Voltage I(typ) I(min) I(max) 0.00V 0.0A NA NA 0.10V -1.0mA NA NA 0.20V -2.0mA NA NA 0.30V -3.0mA NA NA 0.40V -4.0mA NA NA 0.50V -5.0mA NA NA 0.60V -6.0mA NA NA 0.70V -7.0mA NA NA 0.80V -8.0mA NA NA 0.90V -9.0mA NA NA 1.00V -10.0mA NA NA 1.10V -11.0mA NA NA 1.20V -12.0mA NA NA | [End] |***************************************************** According to understanding from IBIS specification document, both above given models should be identical. But, during simulation I am getting different results. Series model with only [R series] is giving desirable result while model with only [Series current] giving totally different results Am I doing something wrong or there is some problem with my simulator??? Thanks in advance Edward -- This message has been scanned for viruses and dangerous content by <http://www.mailscanner.info/> MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by <http://www.mailscanner.info/> MailScanner, 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 Tue Sep 22 02:29:58 2009
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