[SI-LIST] Re: Diode in test load

IBIS does not handle diodes in test circuits so I would just drop the diode
and resistor and put in the C.  Alternatively you could reduce Vref by a
diode drop and put the R and C in. Both of these are compromises.

In the old days these diodes were in the test circuit to simulate the input
characteristics of TTL inputs.  I question why you are still using them
unless there is some other reason to have them.

Tom Dagostino
Device Modeling Division
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 430-1065
tom@xxxxxxxxxxxxx
http://www.teraspeed.com


-----Original Message-----
From: Virendra [mailto:adsurevv@xxxxxxxxx]
Sent: Wednesday, November 20, 2002 3:11 PM
To: tom@xxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Diode in test load


i am sorry, there is only one diode....the test
circuit is in the spec. sheet so i need to put it in
the IBIS model.


--- Tom Dagostino <tom@xxxxxxxxxxxxx> wrote:
> In your circuit I'm surprised if diodes (I see two
> of them) and the R have
> any effect at all.  To get meaningful current in the
> diodes they need to be
> forward biased, have about 0.6 or 0.7 volts across
> them.  With a 1.3 Volt
> supply I don't see how they are going to conduct
> unless they are very low
> forward voltage devices.  Drop the R and diodes and
> just put in the C.
>
>
> Tom Dagostino
> Device Modeling Division
> Teraspeed Consulting Group LLC
> 2926 SE Yamhill St.
> Portland, OR 97214
> (503) 430-1065
> tom@xxxxxxxxxxxxx
> http://www.teraspeed.com
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of
> Virendra
> Sent: Wednesday, November 20, 2002 2:00 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Diode in test load
>
>
>
> Hello all,
> Can someone pl. tell me how i can incorporate a
> diode
> in the test load of an IBIS model. I am trying to
> draw
> a picture of the test setup below.  The diode is in
> series with the RL.
>
>
>            -----1.3V
>             |
>               |
>            ---
>             Diode
>            ---
>             |
>             |
>             ____
>              Diode
>           ----
>               |
>              ____
>               Rl
>              ____
>               |
>
> DUT   --------|--------------OUT
>               |
>            ____
>            Cl
>            ----
>             |
>             |
>             ----GND
>
> Thanks in advance,
>
> Virendra
>
> Virendra Adsure
> viru@xxxxxxxx
>
>
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