[SI-LIST] Re: LVDS RECEIVER IBIS MODEL


Hello All,

I haven't heard any descriptions for greating a 'dynamic clamp' yet.  I'm
still wondering about this.  Wouldn't current need a path through the
internal resistor for it to be accounted for in the I-V data?  If this is
true, then wouldn't the partner input pin need to be tied to something
instead of left floating?  If the partner input pin is left floating, then
current won't flow through the resistor when a sweep is conducted on the
input pin of interest.

Looking forward to hearing about the generation of dynamic clamps.

Thanks,
Adam




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???

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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