RE: [IBIS-Users] input thresholds for ECL model


Subject: RE: [IBIS-Users] input thresholds for ECL model
From: Tom Dagostino (tom@teraspeed.com)
Date: Tue Nov 18 2003 - 00:32:52 PST


Eric

The threshold voltages for any buffer are the absolute voltage for Vinl and
Vinh. Thus for ECL you would see negative numbers and for PECL you would
have positive numbers. For example, from the ON 100lve111 PECL operation
Vinh would be 2.42V and Vinl would be1.49V. For ECL operation Vinh would
be -0.880 and Vinl would be -1.810.

Tom Dagostino

Teraspeed Consulting Group LLC Teraspeed Consulting Group LLC

2926 SE Yamhill St. Device Modeling Division

Portland, OR 97214 13610 SW Harness Lane

                                   Beaverton, OR 97008

http://www.teraspeed.com 503-430-1065

tom@teraspeed.com
  -----Original Message-----
  From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On Behalf
Of erik.van.der.ven@philips.com
  Sent: Tuesday, November 18, 2003 12:15 AM
  To: ibis-users@eda.org
  Cc: john_angulo@mentorg.com
  Subject: [IBIS-Users] input thresholds for ECL model

  This posting was not well received last time, so I post it again.

  With kind regards,

  Ir. Erik van der Ven
  Room DB1029
  Business Line Networking Infrastructure
  Philips Semiconductors BV
  Gerstweg 2
  6534 AE Nijmegen
  The Netherlands
  Phone: +31-24-3534334
  ----- Forwarded by Erik van der Ven/NYM/SC/PHILIPS on 11/18/03 09:15
AM -----

        Erik van der Ven
        11/10/03 10:17 AM

                To: ibis-users@eda.org
                cc:
                Subject: input thresholds for ECL model
                Classification: Unclassified

  Dear IBIS users,

  I am modeling an LVPECL input buffer, using the input_ecl model.
  How are the Vinl and Vinh defined?
  In the 3.2 buffer spec I see an example of negative values. Are these
referenced to supply voltage?
  I cannot find the definition. Can someone tell me where to find it?
  I looked at some buffer models of other's, and found that they use
positive values.

  With kind regards,
  Erik.

  Ir. Erik van der Ven
  Room DB1032
  Business Line Networking Infrastructure
  Philips Semiconductors BV
  Gerstweg 2
  6534 AE Nijmegen
  The Netherlands
  Phone: +31-24-3534334

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