[SI-LIST] AC Coupling and Differential Pair's Termination
- From: "ggafni" <ggafni@xxxxxxxxxxxxxxxxxxxxx>
- To: "Si-List" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 21 Oct 2002 12:04:21 -0700
Dear Experts,
I would like to address this forum with two issues:
AC Coupling
I read the recent thread about the AC coupling, and I would like to
raise couple of more generic questions related to that:
1. When do you think that AC coupling is applicable? By saying that I
refer to more than the case where a 5V device is connected to a 2.5V
device.
2. What are the pros and cons for AC coupling a clock (where one do not
have a DC Balancing issues)
Differential Pairs Terminations
Generally, there are two flavors of differential pair's termination -
Parallel 1 - where a 100ohm or 120ohm resistor is applied between the
positive and the negative traces.
Parallel 2 - where two 50ohm resistors are pulled to one of the rails or
to a Vref.
1. When do you think the first is applicable and when is the other?
2. What are the pros and cons for deploying each one?
Regards,
Gil Gafni
Silverback Systems
695 Cambell Technology Pkwy
Suite #150
Campbell, CA, 95008
Phone: (408) 376 1303
Fax: (408) 376 1399
Email: ggafni@xxxxxxxxxxxxxxxxxxxxx
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