[SI-LIST] Re: Why Termination at Both End ?
- From: Rohit MISHRA <rohit.mishra@xxxxxx>
- To: Rajan Hansa <all.si.list@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 9 Aug 2011 18:25:51 +0800
Rajan,
Here's my 2 cents :
I believe you can use a receiver without matching it's input impedance with
transmission line impedance But Only If the system satisfies these conditions :
1) Transmitter is connected to single receiver.
2) Transmission line is a controlled impedance line and has no
unintentional impedance discontinuities(like via, stub, package lead, etc)
In real system even though board is designed with controlled-impedance traces,
there is still the opportunity for a signal to see an unintentional impedance
discontinuity and in this case just source termination won't stop the ringing
that's why termination at both end.
Rohit
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Rajan Hansa
Sent: Tuesday, August 09, 2011 1:57 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Why Termination at Both End ?
Experts,
Can anyone explain that why in some designs we see source as well as load
terminations, I mean termination at both side of traces ? If ringing is a
issue then only source termination should be sufficient to control it and we
can use a receiver with very high input impedance i.e. no need to match
input impedance of receiver with transmission line characteristics
impedance.
Rajan
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