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

From: Desmond Tan ([email protected])
Date: Mon Nov 01 1999 - 07:32:44 PST

I do agree with Patrick.

To put it in a simple and layman way.I will give an example:-
If you take a 1MHz TTL clock signal, fundamental freq =10MHz but its
odd harmonices may extend further than 100MHz.

BW=1/(pi* Tr) where Tr = risetime.
a Tr=1ns risetime will have high freq of ~300MHz.

So the main criteria of considering high speed signals
are their risetime, but its not clock freq.

Do u think that a 1MHz a high speed signal ?
Yes !

Hope it helps.

>From: Lum Wee Mei <[email protected]>
>To: "'[email protected]'" <[email protected]>
>Subject: [SI-LIST] : Definition of Hi-Speed (UC)
>Date: Mon, 01 Nov 1999 12:54:16 +0800
>
>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.
>
>Regards.
>
>
>
>
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