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[SI-LIST] Re: Source impedance?
- From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 8 Jan 2002 15:59:08 -0800
David,
You are correct. If you can terminate the end of the
line so that there is no reflection coming back, there
is no reason to match the driver. It will just divide
the amplitude as you stated.
Arpad
======================================================
-----Original Message-----
From: David Kaiser [mailto:david.kaiser@xxxxxxxxxx]
Sent: Tuesday, January 08, 2002 2:39 PM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Source impedance?
Theory question. Assume perfect world with no parasitics.
If a 50 Ohm trace on a board is terminated with a 50 Ohm resistor at the end
of the trace, is there any advantage in terms of SI
to driving the trace with a source that has 50 Ohm output impedance compared
to a source with 10 or 20 Ohms of output impedance?
It seems to me that the only thing the series source impedance would do to a
50 Ohm line that is terminated with a 50 Ohm resistive load would be to
divide the amplitude in half without improving the signal integrity.
Correct?
David
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