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To: Chia-Bin Wang who wrote (1507)5/29/1996 7:40:00 AM
From: Jay Charters   of 186894
 
visalia

In regaurd to designs at .18 uM and >= 300 MHz clock rates, the answers
to some of the concerns are as follows:

1. When transistors are reduced in size, current draw through the
junctions drops by a factor similar to the geometry reduction ratio
and there is an increase in the switching speed that is inversely
proportional to this same ratio.

2. The operational frequency for microwave ovens is around 2.0 GHz
(2000 MHz) which matches the resonant frequecy of water molecules
so there is an efficient transfer of electromagnetic energy to
molecular motion, also known as heat. Also, the klystron microwave
source in a microwave oven produces 500-700 Watts of power into an
enclosed shielded cavity. This is far different than the case of
some minor spurious emissions from a microprocessor in a metal cage.

3. The Vcc will probably stay at 3.3 V since that is currently the
new standard and does offer significant power reductions over 5 V
bais. (40% power reduction)

4. To remove the increased heat, which I doubt will increase much from
current designs, an effecient heat spreader (low thermal resistance)
is needed. This can by found by using synthetic diamond wedges under
the IC to efficiently conduct the heat to the final heat sink.

Hope the above sheds some light on the proposed questions

Jay C
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