Frozen Chip from IBM hits 500 GHz 417
sideshow2004 writes "EETimes is reporting this morning that IBM and Georiga Tech have demonstrated a 500 GHz Silicon-germanium (SiGe) chip, operating at 4.5 Kelvins. The 'frozen chip' was fabricated by IBM on 200mm wafers, and, at room temperature, the circuits operated at approximately 350 GHz."
I RTFA.. (Score:5, Informative)
I think that speaks for itself.
THAT WASN'T THE POINT (Score:5, Informative)
Re:In other news... (Score:2, Informative)
Re:THAT WASN'T THE POINT (Score:4, Informative)
Don't you mean "decreases"?
Re:1.2mm per cycle (Score:3, Informative)
:
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*sighs in dismay*
Re:I RTFA.. (Score:1, Informative)
Re:1.2mm per cycle (Score:2, Informative)
Re:Why? (Score:3, Informative)
10GHz Microwave? (Score:5, Informative)
Overall, unless your goal was to build a miniature microwave (a 21st century E-Z Bake Oven?), I don't know why you'd want to use 10GHz instead of 2.4Ghz ones. The tolerances of parts in the magnetron and waveguide would have to be much tighter, I think, and this would almost certainly cause it to be more expensive.
Re:cell phones? (Score:4, Informative)
Yes you are (Score:3, Informative)
You're making the erroneous equation that "chip" == CPU, which is far from the case. A phone's CPU may be clocked much lower. Even if it's integrated with the RF chip (I'm not sure this is ever done, is it?), the RF processing parts will be clock-multiplied or the CPU parts will be clock-divided to ensure sensible running frequencies.
I think you'll also find that, contrary to the assumptions made by most posters here on
Re:cell phones? (Score:2, Informative)
Two speeds: Fast enough and not fast enough (Score:3, Informative)
And in other news, apples and oranges usually taste different.
The only question about computer speed that is important is, "Is it fast enough?" Of course, "fast enough" may change over time, and anytime you come up with a faster processor, some company like Microsoft will succeed in loading it down with bloatware. But I've got a customer who runs his company on software that I wrote for him 15 years ago, and the only reason he ever upgrades his hardware is because something breaks that is no longer available. Otherwise, the 8MHz 286 system would have been perfectly adequate.
Re:The tempurature at which books freeze (Score:2, Informative)
Go rent old Trek seasons 1 & 2 and pay particular attention to this episode [startrek.com].
Re:Article was in EE Times! (Score:5, Informative)
Not really, because an EE would know that it's not just the RF output on a cellphone that works at 2.4 GHz, but also the signal processing unit. There is a digital system in the phone that natively controls the signal, rather than using older analog techniques. The general-purpose CPU for playing crappy java games and displaying inane text messages from your friends runs at something much lower than that, of course.
-JesseThis doesn't mean 500 GHz CPU's (Score:4, Informative)
Re:Safety tip (Score:3, Informative)
Here is a better article (Score:2, Informative)
Re:Ah! (Score:5, Informative)
Not quite... 500 Ghz (500 x 10^9) is a LONG WAY away from even the beginning of Infrared 3 TerraHz (3x10^12), and visible light does not start until about 430 TerraHz (4.3x10^14).
Re:Article was in EE Times! (Score:3, Informative)
Re:Why? (Score:3, Informative)
The why lies a few years away in implementation when the speed is brought down to production levels, but lets give credit to a bunch of scientists with to much funding, time, and liquid helium (?) on their hands. Bravo.
Re:I RTFA.. (Score:3, Informative)
http://games.yahoo.com/games/downloads/qb.html [yahoo.com]
Re:1.2mm per cycle (Score:3, Informative)
Re:Even faster at 0 Kelvins! (Score:1, Informative)
Re:10GHz Microwave? (Score:3, Informative)
Yes, but the heating would be more even.
Re:Ah! (Score:4, Informative)
No, it isn't. 802.11 kit has an RF power output of around 100mW - absolute peanuts compared to your 800W microwave oven. The RF radiation from an 802.11 network isn't enough to cook anything.
What you might be referring to is the thermal output produced by a laptop, which is down to the CPU and hard drive rather than the 802.11 transmitter and that can cook your privates mostly through conduction, not radiation.
Re:Can these these chips do any calculations? (Score:3, Informative)
Not to mention that signals don't travel at c inside the chips. However, the signal path lengths can be decreased substantially by producing 3D integrated circuits. However, then heat dissipation becomes a real problem since there's more silicon for the heat to pass through before it gets to your heatsink. Of course this may not be a problem if your heatsink has a temperature of 4.5K
I'm curious how silicon reacts to these temperatures though - a lot of stuff becomes superconducting at such low temperatures.
Re:10GHz Microwave? (Score:2, Informative)
This is a common misconception about microwaves. 2.45 GHz isn't the best absobed. It's isn't some the frequency water vibrates at. Your article does a good job of explaining this all. To save you the time reading it, I'll quote the clearest line about this. The article you link to says, "The frequency for maximum dielectric loss lies higher than the 2.45 GHz (0.0817 cm-1) produced by most microwave ovens. This is so that the radiation is not totally adsorbed by the first layer of water it encounters and may penetrate further into the foodstuff, heating it more evenly; unabsorbed radiation passing through is mostly reflected back, due to the design of the microwave oven, and absorbed on later passes."
Miss a picture... (Score:3, Informative)