[SI-LIST] Re: AC Termination Question
- From: "McKinley, Jory D" <jory.d.mckinley@xxxxxxxxx>
- To: "'doug@xxxxxxxxxx'" <doug@xxxxxxxxxx>
- Date: Thu, 27 Jun 2002 11:55:51 -0700
Forgot to copy all.
-----Original Message-----
From: McKinley, Jory D=20
Sent: Thursday, June 27, 2002 1:58 PM
To: 'doug@xxxxxxxxxx'
Subject: RE: [SI-LIST] AC Termination Question
Hello Doug,
The capacitor is used in one case to decrease or eliminate the dc power =
of
the line. The capacitor's value cannot be too small as to present the
incoming edge with impedance causing potential reflections. On the =
other
hand, the capacitors value can not be too large as to slow down the =
incoming
edge beyond the design constraints. Based on this one would think that =
an
AC termination with the proper capacitor value would be more =
appropriate on
an un-balanced bit stream due to dc power considerations.
-Enjoy,
Jory McKinley
-----Original Message-----
From: Doug Brooks [mailto:doug@xxxxxxxxxx]
Sent: Thursday, June 27, 2002 12:18 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AC Termination Question
Gurus,
I read somewhere that AC Xline termination (e.g. 50 Ohm line with 50 =
Ohm R
inseries with a cap) required a more-or-less equal bit stream (equal =
number
of ones and zeros) so as not to charge up the cap. Now I'm not sure I
believethat.
Two Questions:
1. For a 50 Ohm RC terminated transmission line (for example) are there =
any
cap values that are better than any others? If so, why?
2. Is AC termination effective for any bit stream? If not, why not?
Thanks --- Doug Brooks
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