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

To: Process Boy who wrote (90079)	1/27/2000 4:52:00 PM
From: Jim McMannis	Read Replies (1) \| Respond to of 1572613

On .18u what % MHZ gain should copper give over aluminum? Then on .13u...everything else equal... Jim

To: Process Boy who wrote (90079)	1/27/2000 5:56:00 PM
From: milo_morai	Respond to of 1572613

Maxwell - <It turns out that the transistors are doing most of the power dissipation not the interconnect. Drive current has to push transistor impedance as well as interconnect impedance. Transistor impedance dominates interconnect impedance (or resistance) at 0.18um. Thus that is why copper K7 doesn't show much in speed enhancement over aluminum K7.> Holy cow! Somebody that gets it. PB I Agree with the DC aspects to some extent about overall loading, but Copper(3/5 the R of Al) helps reduce Heat (P=I^2*R) i.e. 5% reduction here and there will start to add up. Copper does buy much better performance from a AC signal loss point of view, especially as frequencies climb above and beyond 800Mhz. Granted these Runs are very short so the benefits do not show as much until Fo climbs higher or when wire/trace runs have become longer. Milo