[SI-LIST] Re: Terminations Query
- From: "Lynne D. Green" <lgreen22@xxxxxxxxxxxxxx>
- To: <karthikraj.g@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 31 May 2006 10:11:27 -0700
Hello, Karthik,
Allow me to quote, "Be the signal." Following that rule has helped me many
times.
The signal left the driver long ago, and does not remember it. The signal
knows only its present power (voltage and current). The transmission line
impedance determined the ratio of voltage to current at the time the signal
entered the line.
When the signal arrives at the receiver, it divides its power into reflected
signal and signal into the load. This is based only on its immediate
surroundings (Z0 and load).
Things do get somewhat less simple when the signal has a finite transmission
time, particularly when the driver receives the reflected signal before the
outgoing signal transition is complete. This is why we buy simulation tools
(and training on them).
Best regards,
Lynne
"IBIS training when you need it, where you need it."
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@xxxxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Karthik Raj
Sent: Wednesday, May 31, 2006 6:13 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Terminations Query
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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