[SI-LIST] Re: Terminations Query

Think of the transmission line's characteristic impedance as either:
- the impedance of a theoretically infinitely long transmission line
- the impedance of a line seen by a signal before the reflection returns
from the opposite end or other discontinuities on the way

By definition (aka in theory), terminating the transmission line using
it's characteristic impedance is equivalent to the first.  In practice
it lowers the effects of the second, excepting other discontinuities.

--
Mark Randol, RF Evaluation & Application Engineer


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx on behalf of Karthik Raj
Sent: Wed 5/31/2006 8:12 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Terminations Query
=20
Hi,
I have a basic query on the parallel termination techniques that are
widely
used.

When a transmission line is terminated (lets assume a 50ohm parallel
termination) we tend to match the Parallel termination resistance with
the
Trace Impedence. Instead shouldn't we match the Termination resistance
to
Source impedence of the driver + Trace Impedence, since they both are in
series?

Please forgive me if i am sounding stupid.

Thanks,

Karthik
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