Hello, Radovan, One could look into ICM Nodal or Path models. ICM s-parameters can be built from the RLC values, or any of the EDA extraction tools that can generate Touchstone files. These solutions are supported by most IBIS EDA tools. As an alternative, some EDA tools (HSPICE, Mentor, and Cadence come to mind) allow SPICE (RLC, Tline) subcircuits (netlists, models) to be used with IBIS buffer models. This does limit the choice of tools, since external SPICE subcircuits are not supported by all IBIS EDA tools. Best regards, Lynne "IBIS training when you need it, where you need it." Dr. Lynne Green Green Streak Programs http://www.greenstreakprograms.com 425-788-0412 lgreen22@mindspring.com -----Original Message----- From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Radovan.Vuletic@infineon.com Sent: Thursday, March 23, 2006 8:15 AM To: ibis-users@eda.org Subject: [IBIS-Users] How to replace RLC package Hi experts, once again (almost) the same question, but now other way around ... Recently I am getting lot of pressure to figure out how (in which format) to generate reasonable package model for IBIS models of our components. Possible solutions: ============== 1.) [Sparse Matrix] - contra: tools that generate [Sparse Matrix] models can't generate models for multidrop networks (i.e. one pin one the input, more than one pads on output), sloppy support from simulation tools 2.) ICM - contra: no available tool for automated extraction (and nobody wants to do it manually :-(((() 3.) Simple RLC parameters - contra: no information about cross-coupling RLC elements (coupling capacitances, mutual inductances, etc.) Workaround: use HSpice model of package, but how to "connect" it with IBIS model? IBIS 4.1 provides new keywords [External Circuit], [End External Circuit], [External Model], [End External Model] [Node Declarations], [End Node Declarations], [Circuit Call] and [End Circuit Call] to support multi-lingual models - nice! Main question: Is there a possibility to replace package description in [Pin] section of [Component] with some [External Circuit] or [External Model] or [Node Declarations]? So what I want to do is to replace: [Pin] signal_name model_name R_pin L_pin C_pin | A1 VDD POWER 210m 4.07nH 0.27pF A2 NF NF_INPUT 168m 2.70nH 0.19pF . . . T8 VSS GND 127m 1.45nH 0.23pF T9 VSSQ GND 151m 2.18nH 0.13pF With a call to HSpice netlist [Circuit Call] Pointer to HSpice model of package [End Circuit Call] Or [External Circuit] Pointer to HSpice model of package [End External Circuit] Allows IBIS 4.1 something like that - is IBIS 4.1 planed for something like that at all? When I take a look (please see below) on a Figure 1 provided in IBIS specs, I am not sure that it is possible. | The placement of these keywords within the hierarchy of IBIS is shown | in the following diagram: | | | |-- [Component] | | | ... | | |-- [Node Declarations] | | |-- [End Node Declarations] | | | ... | | | ... | | |-- [Circuit Call] | | |-- [End Circuit Call] | | | ... | | ... | |-- [Model] | | | ... | | |-- [External Model] | | |-- [End External Model] | | | ... | | ... | |-- [External Circuit] | |-- [End External Circuit] | | ... Has anybody some idea about it? Many thanks for every answer! Best regards / Mit freundlichen Grüßen / S po¹tovanjem Radovan Vuletiæ Infineon Technologies AG MP PD PDE MUC/10.2.236 AP 3 Am Campeon 1-12 D-85579 Neuebiberg Phone: +49 (0)89 234 20108 Fax (PC): +49 (0)89 234 955 5305 E-mail: radovan.vuletic@infineon.com |------------------------------------------------------------------ |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 Mar 23 12:13:54 2006
This archive was generated by hypermail 2.1.8 : Thu Mar 23 2006 - 12:14:46 PST