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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 215.32-0.2%Dec 30 3:59 PM EST
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To: Joe NYC who wrote (118258)4/3/2004 8:54:02 PM
From: Dan3Read Replies (1) of 275872
 
to pravin - This was posted by MrAMD on IH

to pravin - (could someone post this on SI)

in the last sentence you seem to be mixing both the static and dynamic currents.

from a pure dynamic standpoint, your biggest savings are from reduced voltage. bear in mind that kink/history effects happen here. also for this you need to know if FDSOI or PDSOI is being used. if FD then you need not have to worry about these effects as much. for PD becos of the dynamic vt modulation happening due to the bipolar formation normally the transistor tends to average down to lower vt implying faster switching and this allows usage of lower supply voltage to get the same performance as bulk. also helping you(as you have mentioned), is the reduced load capacitance(reduced junction caps).

from a static standpoint(i am presuming this what you mean by saying amd may have the same problems - off currents), things get a little tricky. normally there are different vt devices. depending on what you need the respective devices are used. if performance critical, then low vt devices if not high vt devices which cut down the static leakage. for example, we have something like ultra high speed transistors or high speed transistors or standard transistors(high VT). this is further helped by what amd is doing. there are not gunning for clockspeed, but instead going for overall system performance improvement. this allows them to pick and choose what to speed up and what not to. this where intel appears to have hit a brick wall.

example : altera vs xilinx in regards to 90nm(if remember correctly xilinx had quite a bit of problems when transitioning to 90nm). altera took the right approach of not going full blast. they enhanced performance where necessary and at other places limited leakage by using high VT devices.

hope this helps.
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