Author: Christophe Theron
Date: 17:35:05 05/26/99
Go up one level in this thread
On May 26, 1999 at 13:57:08, Robert Hyatt wrote:
>On May 26, 1999 at 13:36:06, Dann Corbit wrote:
>
>>On May 26, 1999 at 12:38:05, Charles Unruh wrote:
>>
>>>Will such chips have special housings?
>>No, but they'll come with a free voucher for cataract surgery.
>>;-)
>
>
>Also if you set a russet potato down by the case, in 5 minutes you
>will have a baked potato. :)
>
>A couple of serious points...
>
>1. No one knows what is going to happen at 1ghz yet. One thing that
>has been seen is 'atom migration' where at such frequencies, material on
>the chip physically moves around. The effect on ICs is unknown at present.
>
>2. HAM radio folks know (as do those having had a physics course that covers
>electricity and magnetism) that at 1ghz frequencies, electrical properties
>change significantly (ie check out coax cable used for normal RF frequencies
>rather than the waveguides used for microwave frequencies). What happens inside
>at these frequencies is going to be interesting to find out. Ie yes it _can_
>be done, but _do_ we really want to do it? :)
>
>That was one of many issues that prevented Seymour Cray from producing a 1ghz
>machine before his death. 1ghz is _tough_. And 2 ghz is _really tough_.
What about problems with the GSM cellular phones frequencies?
Standard GSM uses 128 frequencies in the range 890-915MHz, and 935-960MHz (close
to 1GHz), and in the USA frequencies around 1.8GHz are used too.
Christophe
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