RE: [SI-LIST] : Return path for stripline, two ground planes or o ne power and one ground?

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From: Chris Cheng (chris.cheng@3pardata.com)
Date: Tue Apr 04 2000 - 12:25:54 PDT


actually, most of the current pecl designs are differential in which the
switching
current returns through the complimentary side. the differential part
doesn't really
need a fixed reference plane. the common mode part will suffer from plane
discontinuity.
chris
-----Original Message-----
From: Vinu Arumugham [mailto:vinu@cisco.com]
Sent: Tuesday, April 04, 2000 11:57 AM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : Return path for stripline, two ground planes or
one power and one ground?

"Ingraham, Andrew" wrote:

>
>
> If the driver is PECL, then ~all the switching current goes through the
IC's
> power (+Vcc) pins and ~none through the ground (-Vee) pins. In that case,
> stripline between two power planes would be best. (Or with normal ECL,
use
> stripline between two ground planes. That's why ECL used a negative
> supply!)
>

But PECL is usually implemented with pull down resistors to GND at the
source. It seems to me then that there will be no difference whether the
stripline is implemented between GND planes, power planes
or one of each.

Vinu

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