Hi Andy, You have to be careful trying to model to model the PDS in this way. While the lumped, low frequency loop inductance approximation of the signal nets with respect to their reference can be reasonably captured, the same cannot always be said for power and ground pins. Trying to model these structures with a partial inductance approach can be tricky, as the mutuals must be included for the partials to be meaningful. Also, depending on your current transients and frequencies of interest, a linear PDS model simply may not be appropriate. If you want to move beyond the ideal power supply regime, care must be taken to model the PDS appropriately. You'll want to include the frequency dependent coupling between the signals and the PDS as well, in order to fully characterize the SSO effects on your system. Please let me know if you have any questions on this. Thanks! Sam _____ From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Andy Joe Sent: Wednesday, July 27, 2005 4:18 AM To: ibis-users@eda.org Subject: [IBIS-Users] IBIS Question Hi, I have a question regarding the [Package] keyword in an IBIS file. As far as I am concerned, the RLC values in this section applied to all the I/O pins, my question is if these RLC values also applied to power and ground pins as well? If they are not applied to power and ground pins, how can we address the effects of different packages to the power and ground pins in an IBIS model? (If R_pin, L_pin and C_pin for every single pin are not available, only package min, typ and max RLC are available) Thanks. -Andy _____ Start <http://us.rd.yahoo.com/evt=34442/*http:/www.yahoo.com/r/hs> your day with Yahoo! - make it your home page |------------------------------------------------------------------ |For help or to subscribe/unsubscribe, email majordomo@eda.org |with just 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 written 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 Thu Jul 28 20:55:28 2005
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