[SI-LIST] Re: 22.1 Ohm vs 50 Ohm Termination
- From: "Ibrahim Khan" <ikhan@xxxxxxxxxxxxxxxxxxx>
- To: <Andrew.Ingraham@xxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 30 Aug 2002 13:01:26 -0500
Andy,
What is the reason for the clock to be able to tolerate the overshoot
but not the undershoot.
Thanks
Ibrahim
-----Original Message-----
From: Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxx]=20
Sent: Friday, August 30, 2002 12:24 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 22.1 Ohm vs 50 Ohm Termination
> Sometimes a resistor value a bit on the low side is selected ( Zdriver
> + Rresistor < 50). This causes a bit of overshoot at the receiver and=20
> speeds up the ristime at the receiver compared to the perfectly=20
> terminated case.
=20
This is especially useful in the case of clocks, which can tolerate some
overshoot but not much undershoot (plateauing before reaching
full-swing).
Andy
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