Hello Experts, I am finding problem with one of my IBIS model in I-V and V-t curve mismatch. Please find the attached model for the refernence. ERROR - Model dummy: The [Rising Waveform] with [R_fixture]=80 Ohms and [V_fixture]=0V has TYP column DC endpoints of 0.01V and 2.66v, but an equivalent load applied to the model's I-V tables yields different voltages (-0.00V and 3.90V), a difference of 0.25% and 31.85%, respectively. I wrote a new tool to generate IBIS models and i am not able to make out where it is going wrong. I actually tried to manually calculate the currents at the points , that it has reported in the above error. As it is a rising waveform having a R_fixture to ground the current at 2.66v (steady state) would be 2.66v/50 = 33.25mA. I looked at the voltage corresponding to 33.25mA in pullup table and i found it is coming around 0.66v. There is a mismatch in the way i am caluculating also. But i observed a different voltage of 0.66v compared to what ibischk4 has reported i.e, 3.9v. Let me know is the way i am cross checking is correct or not ? If not let me know the exact procedure. Also let me know what might have been gone wrong in the curves. From the shape of the curves i am not seeing any problem with the way i have generated. Please let me know your answers as soon as possible. Note : Please dont consider any other values apart from the curves like Ramp , C_comp etc as i have dummy values for these place holders. Thanks & Regards Sudarshan -- 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
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