North American Network Operators Group|
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RE: Silicon-germanium routers?
> > I also suspsect that the community is not ready to transition to > > liquid-cooled systems. > > I rather assumed 'at room temperature' implied a standard heat sink > and fan. > > > Perhaps there's not enough information in that article to draw a > conclusion from. There are a few bits that folks should understand: first, SiGe has been around for awhile. It's not new. It's used when higher frequencies are necessary, such as when building a 40Ghz modulator for an OC-768c interface. SiGe is more expensive, less thermally efficient, and less dense than 'standard' CMOS. So it's already headed the wrong way for most of our applications. Second, you should know that there are lots of folks who really are experimenting with a single transistor. This may sound ludicrous, but the thought here is that process improvements will eventually scale. Thus, the conclusion that I'm leaping to is that this room temperature transistor at 350GHz really is at room temp, but may require something like a muffin fan all by itself. Obviously to scale that to a few hundred million transistors in a router, you then need a few hundred million little fans. ;-) The breakthrough that we're looking for is a high speed, high density, low power transistor that can be commercially scaled with good yield. Not there quite yet. Tony