RE: [IBIS-Users] IBIS LVDS Receiver 100 ohm termination modeling

From: Mirmak, Michael <michael.mirmak@intel.com>
Date: Thu Jan 27 2005 - 14:42:37 PST

Bob,

Thank you for your interest in IBIS! What you propose certainly looks
feasible. In addition to the syntax you show, you might also consider
adding single-ended buffer models for each of the A and B pins, if these
demonstrate diode clamping behaviors, single-ended internal terminations
and/or other features not captured by just the series resistive element
between the pins. The IBIS specification permits single-ended buffers
to be used in conjunction with series elements.

Also note that, if the resistance of your receiver termination is
non-linear but is time-invariant, you might instead use [Series Current]
or [Series MOSFET] in place of [R Series].

- Michael Mirmak
  Intel Corp.
  Chair, EIA IBIS Open Forum

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Johnson Jr, Robert H. (FL51)
Sent: Thursday, January 27, 2005 2:21 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] IBIS LVDS Receiver 100 ohm termination modeling

Is this the standard approach for modeling an LVDS receiver with a 100
ohm
termination?

[Series Pin Mapping] pin_2 model_name function_table_group
|
A B rterm_100

[Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
|
A B 100mV 0 0 0

|
************************************************************************
| 100ohm differential resistor
|***********************************************************************
*
|
[Model] rterm_100
Model_type Series
|
| (typ) (min) (max)
|
C_comp 0.1000pF 0.1000pF
0.1000pF
[Temperature Range] 25.0000 100.0000 0.000
[Voltage Range] 2.5000V 2.3750V
2.6250V
[R Series] 105 125 80

thanks,
Bob

|------------------------------------------------------------------
|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 1993
Received on Thu Jan 27 14:42:43 2005

This archive was generated by hypermail 2.1.8 : Thu Jan 27 2005 - 14:43:43 PST