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

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From: Douglas McKean ([email protected])
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

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

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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