Re: [SI-LIST] : Definition of Hi-Speed (UC)

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From: Douglas McKean (dmckean@corp.auspex.com)
Date: Tue Nov 02 1999 - 13:38:38 PST


At 12:54 PM 11/1/99 +0800, Lum Wee Mei wrote:
>Pardon me for asking this stupid question because I am at a loss of how
>to explain hi-speed to my boss. He thinks that hi-speed is as simple and
>straightforward as resistance = V/I and nothing else. Hi-speed should be
>some circuits that need to operate at xxMHz or more. Anything less than
>xxMhz is not hi-speed.
>
>I would appreciate anyone of you experts out there who can enlighten me
>in a simple and easy to understand definition so that my boss can
>understand.

Depends ...

Strictly personal opinion but anything that requires
3rd order type analysis is high speed for me. What do
I mean by this? 2.45 GHz can be cheaply created and
pumped into a cavity to heat your coffee. Designing
an ECL circuit running at 10 GHz can be a virtual
nightmare.

1st order analysis: signal goes down wire.
2nd order analysis: 1st order + wire impedances.
3rd order analysis: 2nd order + transmission line
                    modeling with parasitics, reflections,
                    bandwidth considerations from
                    transition times, odd and even mode
                    impedance concerns, etc ...

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