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

To: Dan3 who wrote (69533)	8/22/1999 11:21:00 AM
From: Bill Jackson	Read Replies (2) \| Respond to of 1573984

Dan3, As things get smaller the trace resistance becomes larger, copper helps abate this as it is a better conductor. In addition as things get smaller they get closer together and so signal coupling from trace to trace gets to be a bigger problem..with coppers' better conductivity they can increse the spacing slightly and cut the crosstalk where needed, obviously you balance the loss of conductivity from smaller against the less crosstalk from wider gaps empirically. Copper is also more ductile than aluminium which may help in the damascene processes. There are probaly other pros/cons from copper. Bill