Author: Robert Hyatt
Date: 20:33:43 05/26/99
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On May 26, 1999 at 20:35:05, Christophe Theron wrote: >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 whatis missing is that you don't find .18 micron stuff in a cellular phone. small gates have interesting problems. Have seen a couple of interesting papers on this problem of 'molecular mobility' and its effects on IC semiconductors. Nothing said it is a killer problem, but nothing says it can be ignored either. This will be interesting to watch.
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