[SI-LIST] Re: LVDS RECEIVER IBIS MODEL
- From: Adam.Tambone@xxxxxxxxxxxxxxxxx
- To: tom_dagostino@xxxxxxxxxxx
- Date: Fri, 26 Jul 2002 09:44:27 -0400
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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| To: "'kevinqc@xxxxxxxxxxx'" <kevinqc@xxxxxxxxxxx>,
plaflamm@xxxxxxxx, si list <si-list@xxxxxxxxxxxxx> |
| cc:
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| Subject: [SI-LIST] Re: LVDS RECEIVER IBIS MODEL
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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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