[SI-LIST] FW: Re: FW: IBIS modelling in PSpice
- From: "Chris Schmolze" <schmolze@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 5 Jan 2006 15:16:35 -0600
=20
=20
Arpad,
You are correct this approach falls short of capturing the interaction
between the tables. Useful in some cases but, less than ideal. I have
seen the case where the interaction between the curves was known and the
tables were input into an polynomial statement which contained the
equation that defined that interaction.
I should also mention that the IBIS-to-PSpice translator considers v-i
and not v-t curves so there is a shortcoming to that approach also.
Perhaps there are other translators that do. In summary, an equivalent
to the HSPICE B-element does not exist in PSpice. Off subject.. though
it does in PSpice's big brother SPECTRE.
R- Chris
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Muranyi, Arpad
Sent: Thursday, January 05, 2006 12:49 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: FW: IBIS modelling in PSpice
Chris,
Correct me if I am wrong, but what you describe below seems to be an
extraction of each data table (I-V and V-t) into separate PWL sources in
PSPICE. Simulating the tables by themselves may be useful in some
cases, but is not the same as simulating the complete IBIS buffer model
in which the I-V and V-t tables interact with each other. I believe
Nikhil was looking for an HSPICE B-element equivalent (IBIS buffer
element) in PSPICE.
Sorry for pestering you this much on this, I am not doing this to give
you a hard time, honest. I am also curious to see what the answer is.
Thanks,
Arpad
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D
=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D
=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
=3D On Behalf Of Chris Schmolze
Sent: Thursday, January 05, 2006 10:21 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: FW: IBIS modelling in PSpice
Arpad,
I thought "model IBIS in PSpice" had some room for interpretation so I
thought I'd add an angle to the thread that was not mentioned, just in
case it helped. If Nikhil's question is "How do I use my IBIS model in
PSpice" then,
Nikhil,=3D3D20
PSpice has an IBIS to SPICE translator but, does not have an expression
that an IBIS model could be assigned directly to. ETable and GTable
values need to be used.=3D3D20
1.Use the ETABLE part from PSpice ABM libraries or if you use PSipe in a
text mode an example is below.
2.In the TABLE property of this part define your data values in the
format
(x1,y1) (x2,y2) ....and so on i.e. your IBIS curve data
3. To the input side of ETABLE part place a DC source, Output of ETABLE
can be terminated to desired load.
4. Set up a DC sweep with the sweep values set to the value list =
=3D3D3D
=3D
x1
x2 x3 x4
.......
5. Run the simulation and the waveform corresponding to data values
should be plotted in the probe.
One can use a combination of controlled sources on either side of ETABLE
to plot any data points relation like (I vs V) , (V vs V) or (V vs I) or
(I vs I).
Alternatively a GTABLE can be used.
In a text mode we might have something like this:
.SUBCKT GND_CLAMP OUT+ OUT- IN+ IN-=3D3D20
* Connections Out+ Out IN+ IN-=3D3D20
GGND_CLAMP OUT+ OUT- TABLE {V(IN+,IN-)}=3D3D20
+ -3.300 , -83.930m=3D3D20
+ -3.200 , -81.070m=3D3D20
+ -3.100 , -78.170m=3D3D20
+ -1.100 , -15.290m=3D3D20
+ -1.000 , -12.250m=3D3D20
+ -900.000m, -9.370m=3D3D20
.ENDS=3D3D20
Notice in the above that the values of the TABLE can be copied from a
csv text file or other TABLE information such as MS-Excel, or wherever
you've your IBIS curve data.
The advantage here is that you can change the information in excel and
copy paste the=3D3D20 information here.=3D3D20
R- Chris
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Muranyi, Arpad
Sent: Thursday, January 05, 2006 10:34 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: FW: IBIS modelling in PSpice
Chris,
I think the article you are referring to is the opposite of what Nikhil
was asking for. The article explains how to make an IBIS file from a
transistor level buffer model in PSPICE.
I think he was asking how to take an IBIS model and simulate with that
in PSPICE.
Arpad
------------------------------------------------------------
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
=3D3D3D On Behalf Of Chris Schmolze
Sent: Thursday, January 05, 2006 5:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] FW: IBIS modelling in PSpice
=3D3D3D3D20
Nikhil,
=3D3D3D3D20
The PSpice equivalent to the Berkeley standard B-element is the EVALUE
voltage-controlled voltage source and GVALUE voltage-controlled current
source.=3D3D3D3D20
The EVALUE and GVALUE parts are located in the ABM library and are
documented in the PSpice Reference Guide.
If you'd like to use PSpice to create IBIS models here is a link to an
app. note "Creating IBIS Models using PSpice and Allegro PCB SI Model
Integrity". The app. note come with a kit or sample PSpice project.
http://www.cadence.com/community/allegro/pcb_si/tr.aspx?type=3D3D3D3D3DMo=
d
e=3D
li=3D3D
n
g=3D3D3D
&s=3D3D3D3D
o
rt=3D3D3D3D3D&abs=3D3D3D3D3D&exclude=3D3D3D3D3D
R- Chris Schmolze
Cadence
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of nrpatel@xxxxxxxxxxx
Sent: Tuesday, January 03, 2006 3:56 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] IBIS modelling in PSpice
Hello,
Is there a way to model IBIS in PSpice? If so can anyone show me how?
I am not looking for an exact representation. A behavioral model would
be just as fine.
Thanks
Nikhil=3D3D3D3D20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =3D3D3D3D20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=3D3D3D3D20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =3D3D3D20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=3D3D3D20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =3D3D20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=3D3D20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =3D20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=3D20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
- » [SI-LIST] FW: Re: FW: IBIS modelling in PSpice
