Re: [SI-LIST] : Transmission line termination

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Fri Apr 06 2001 - 08:50:27 PDT


Sunil,

The average DC level is different.

Terminating to a Vtt that is near the switching threshold causes a
signal swing which is relatively symmetric about the threshold. This
is the case with SSTL-2 signalling.

scott

sunil-chandra.kasanyal@st.com wrote:

> Hello all,
> What is the difference between these two terminations?Why?
> 1)
> -----------------------
> DRIVER->-----| TRANSMISSION LINE |-------------RECIEVER
> ----------------------- \
> Zo=50ohms /Rtt=50ohms
> \
> /
> ---GND
> 2)
>
> -----------------------
> DRIVER->-----| TRANSMISSION LINE |-------------RECIEVER
> ----------------------- \
> Zo=50ohms /Rtt=50ohms
> \
> /
> ------TERMINATION VOLTAGE=Vtt
>
> If signals of 5V come from drivers,no reflection will take place at the
> reciever ends.Since in above two cases,way of termination is
> different,what exactly the different uses of these two terminations.
>
> Regards
> Sunil
>
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--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
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