[SI-LIST] Re: LVDS RECEIVER IBIS MODEL

???

Voltage range is required and I assume 0.00 pF is a typo?

Tom Dagostino
Modeling Manager
Mentor Graphics Corp.
SAS
tom_dagostino@xxxxxxxxxx
503-685-1613


-----Original Message-----
From: Kevin (PSD) Chung [mailto:kevinqc@xxxxxxxxxxx]
Sent: Thursday, July 25, 2002 9:58 AM
To: plaflamm@xxxxxxxx; si list
Subject: [SI-LIST] Re: LVDS RECEIVER IBIS MODEL 




   It is almost correct.  Since the 100ohm
termination is between P and N, therefore,
you do not need to define the voltage for it.

   I would rearrange it as following:

[Model]  rterm_100
Model_type  Series
C_comp                  0.1pF   0.1pF  0.1pF
[Voltage Range]         0.00pf  NA     NA
[R Series]              100     80     120

   I think this will do it.

good luck,

Kevin,


-----Original Message-----
From: Peter LaFlamme [mailto:plaflamm@xxxxxxxx]
Sent: Thursday, July 25, 2002 8:09 AM
To: si list
Subject: [SI-LIST] LVDS RECEIVER IBIS MODEL=20



Hi All,
I posed the question below to the ibis reflector and received a few =
responses. I am unsure if any will work for sure.
I figured that there may be people on the SI reflector that would have =
knowledge of how to implement this.

I appreciate any help you can offer.


Regards,=20
Peter

--=20
Peter LaFlamme

Applied Micro Circuits Corp.
System Applications Engineer
200 Minuteman Rd, 3rd Floor
Andover, MA 01810

978-247-8470 phone
978-623-0055 Fax


___________________________________________________________


Question:=20

I am tasked with creating an IBIS model for an LVDS receiver cell that =
has an internal 100
ohm termination between the P and N nodes. I had asked Bob Ross about =
this a while ago and
as usual he was very helpful. From his response I used the following
implementation:=20

|****************************************************************
|                       Component:  LVDSRCV
|****************************************************************
|
[Component]      LVDSRCV
[Manufacturer]   AMCC
|=20
|=20
|
[Package]
|  variable       typ          min           max
R_pkg            1E-3          NA            NA
L_pkg            1E-9          NA            NA
C_pkg            1E-12          NA            NA
|
[Pin]        signal_name     model_name         R_pin   L_pin   C_pin
  1             PAD          lvdsrcv            NA      NA      NA
  2             PADN         lvdsrcv            NA      NA      NA
|=20
[Series Pin Mapping]    pin_2   model_name      function_table_group
1                     2           rterm_100

|=20
[Diff_pin]      inv_pin     vdiff     tdelay_typ    tdelay_min    =
tdelay_max
|=20
   1               2          0.2          0             0             0

[Model]  rterm_100
C_comp                   0.1pF   0.1pF  0.1pF

Model_type  Series
|variable        R(typ)  R(min)  R(max)
[R Series]      100     80      120

[Temperature Range]     25.00    125.00    0.00
[Voltage Range]         1.800    1.650   1.950

*************************************************************************=
***************


I was able to get the model past the IBIS checker but my simulations did =
not show the 100
ohm terminator. I was using a tool which I believe does not support this =
implementation
(no need to mention names). I have seen other implementations where I =
believe
a "Dynamic clamp" is used to model the termination behavior, but I am =
unsure. Can anyone
guide me to some reference material or weigh in with your experience or =
help.
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