RE: [IBIS-Users] Sweep voltage listing query

Abrar

Is the question you are asking:  I notice that the IBIS specification says
that IV tables should sweep between -Vcc and 2*Vcc.  In most models I have
seen the Vcc value is that of the typical setup.  Why don't the tables use
the max value for Vcc?

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

  -----Original Message-----
  From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On Behalf
Of Muranyi, Arpad
  Sent: Tuesday, April 11, 2006 8:40 AM
  To: ibis-users@eda.org
  Subject: RE: [IBIS-Users] Sweep voltage listing query


  Abrar,

  The pullup and power clamp tables are Vcc relative, so
  the origin of these IV tables are at the supply voltage.
  When the supply voltage moves for min and max, the origin
  of the IV tables moves together with it.  The end points
  of the tables only determine the sweep range, which has
  nothing to do with what the supply voltage variation is.

  I hope this clarifies your question.

  Arpad
  ---------------------------------------------------------



----------------------------------------------------------------------------
--
  From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Abrar Ahmed
  Sent: Tuesday, April 11, 2006 3:08 AM
  To: ibis-users@eda.org
  Subject: [IBIS-Users] Sweep voltage listing query


  Dear Experts,

  I request help in the following IBIS query:

  In all IBIS files I have observed that for V-I characteristics, voltage
sweep listing is only of the "typical case", eg : if the typ=3.3V, min=3V,
max=3.6V

  then the listing starts from -3.3V and goes till 6.6 V. For min and max
conditions we change only the supply/clamp voltage and temperature, but not
the sweep range,
  which is always the "typical case" values. Is my understanding correct ?

  Or if there is a change in all these values together, why is it not listed
in the IBIS file separately.


  Thanking you'll in advance,
  Abrar



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