[SI-LIST] Re: LVDS termination method
- From: Srivats Partha <vats123@xxxxxxxxx>
- To: supratim.basu@xxxxxxxxxxxxxxxxx, Gil Gafni <gafnigil@xxxxxxxxxxxxx>
- Date: Wed, 18 Apr 2007 13:26:28 -0700 (PDT)
Hello
I think you must be using a Pi or T network inorder to terminate both even
mode and odd mode imperences. Just out of curiosity what is the interconnect
bewteen your TX and RX? Stephen Hall. High-Speed Digital System Design?A
Handbook of Interconnect is a very good book that explains this concept. Gil's
idea of AC coupling is a neat way of avoiding the problem of setting the
common mode voltage.
regards
srivats
--
P.Srivatsan
Graduate Student
ECE Dept,North Carolina State University
http://www4.ncsu.edu/~spartha2/
--
I have no special talents. I am only passionately curious. AE
----- Original Message ----
From: Siva <supratim.basu@xxxxxxxxxxxxxxxxx>
To: Gil Gafni <gafnigil@xxxxxxxxxxxxx>; supratim.basu@xxxxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Sent: Wednesday, April 18, 2007 11:10:18 AM
Subject: [SI-LIST] Re: LVDS termination method
Hi,
Thanks Gil.
But I am using Spartan-II as reciver, which intern has only 2.5V LVDS.
I suppose we should use some resitot network but not sure about exactly.
Regards,
Supro
Gil Gafni wrote:
>
>Greetings Supro
>
>Not knowing the receiving side makes it complex to answer.
>Most receivers today are graded as "3.3V tolerant" which mean that they
can
>be connected to a 3.3V driver without compromising the performance.
>To be on the safe side you can use a simple AC coupling (about 1nF
>capacitor) and terminate with the 100ohm BEFORE the AC coupling -
>
>----------------------| |---------
> /
> \
> / 100ohm
> \
>---------------------| |------------
> ~1nF
>
>BR
>
>Gil
>
>
>
>----- Original Message -----
>From: "Supratim Basu" <supratim.basu@xxxxxxxxxxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Sent: Wednesday, April 18, 2007 7:16 AM
>Subject: [SI-LIST] LVDS termination method
>
>
>> Hi,
>>
>> I am interfacing LVDS 3.3V transmitter to LVDS 2.5V receiver and vise
>> versa.
>> I am using simple 100 Ohm diffential termination.
>> Is the alright to use this termination?
>>
>> Thanks in Advance,
>> Supro
>>
>>
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>
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