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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Bill Jackson who wrote (77125)	10/26/1999 1:10:00 PM
From: Mani1	Read Replies (2) \| Respond to of 1571068

Charles Re <<Often shrinks drop the voltage to drop the heat per unit area.>> Heat density does not drop in process shrink, the absolute power does lower however. If voltage does not drop after a process shrink, that is a bad thing for thermal manage, voltage should drop after a process shrink. Mani

To: Bill Jackson who wrote (77125)	10/26/1999 1:12:00 PM
From: Charles R	Read Replies (2) \| Respond to of 1571068

Bill, <Are you sure the voltage should remain the same? Often shrinks drop the voltage to drop the heat per unit area.> I expect the voltage to stay about the same or drop slightly, say by 0.1V - excluding the laptop parts, of course. Chuck

To: Bill Jackson who wrote (77125)	10/26/1999 1:56:00 PM
From: Saturn V	Read Replies (4) \| Respond to of 1571068

Ref <Are you sure the voltage should remain the same? Often shrinks drop the voltage to drop the heat per unit area.> A shrink of the MOS gate , must be accompanied by an equivalent reduction in gate oxide thickness.If this is not done the gate will not shutoff in the OFF state. The thinner oxide and shorter channels create several reliability problems, unless the voltage is reduced. So most shrinks are accompanied by a reduction in voltage. Luckily the power dissipation on a chip drops dramatically with a shrink because of the the reduced Capacitive loads and lower voltages. However the part gets faster, and the higher speed negates some of lower power.[ P = fCV^2]. So the shrinks typically run cooler and at a lower voltage.