Re: [SI-LIST] : PECL Termination

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From: Mike Jenkins (jenkins@lsil.com)
Date: Thu Mar 08 2001 - 17:21:34 PST


Gary,

The topology you describe is electrically equivalent to the "Y".

    o-----^^^---+---^^^-----o o-----+---^^^---+-----o
                | /---\ | |
                < \---/ < <
                < < <
               _|_ _|_ _|_
               /// /// ///

You can find the conversion formulas in a circuits text under
"T-PI" or "wye-delta" transformations. Hope that helps.

Regards,
Mike Jenkins

"Steinkogler, Gary" wrote:
>
> I have Differential PECL running at 327Mhz. I have seen thevenin equivalent
> parallel, Y variance, diode terminations, but not much on three point
> termination - 120 ohm across differential pair and 280 ohm from each signal
> to ground. Anybody out there ever use the 3 point topology?
>
> Gary Steinkogler
> Optical Solutions
> 16305 36th Ave. North
> Suite 300
> Minneapolis, MN 55446-2698
> Phone: (763) 268-3633
> Fax: (763) 268-3301
> Main: (763) 268-3300
>
> email:gsteinkogler@opticalsolutions.com
>
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