[SI-LIST] Re: LVDS RECEIVER IBIS MODEL
- From: "Dagostino, Tom" <tom_dagostino@xxxxxxxxxxx>
- To: "'kevinqc@xxxxxxxxxxx'" <kevinqc@xxxxxxxxxxx>, plaflamm@xxxxxxxx,si list <si-list@xxxxxxxxxxxxx>
- Date: Thu, 25 Jul 2002 14:12:20 -0700
???
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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