RE: [SI-LIST] : Combined single-ended/differential termination pa ckage?

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From: Ron Miller (rmiller@brocade.com)
Date: Mon Feb 26 2001 - 17:33:57 PST


Hi Eric

Why not just use a single resistor to terminate the differential mode,
which is the signal you are intrested in.

Tieing the center-tap to ground allows common mode currents to flow
which usually end up allowing power supply ground currents to get into
the sensitive signal paths.

Ron miller

-----Original Message-----
From: Eric Goodill [mailto:ericg@redback.com]
Sent: Monday, February 26, 2001 3:47 PM
To: Larry Miller; si-list@silab.eng.sun.com
Subject: [SI-LIST] : Combined single-ended/differential termination
package?

Hi,

We often use this termination scheme:

SIG+ -------+
            |
            R
            |
            +--C--+
            | |
            R V
            | GND
SIG- -------+

That is, two resistors in series between the differential signals with a
center-tapped capacitor to ground. Is there a combined device to sucks
all these parts into a three-pin package?

Regards, Eric

-- 
Eric Goodill                    Redback Networks
ericg@redback.com               300 Holger Way
voice: (408) 571-5319           San Jose, CA 95134-1362

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