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  #21 (permalink)  
Old 6th July, 2006, 02:35 PM
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Quote:
Originally Posted by skool h8r
is that actually physically possible? I've got the best cooling...outer space! since there are no gas particles in space, or very small amounts of them, it means that there's also very little heat out there because there's nowhere to transfer the heat to. So forget the LHe, bring on the Vacuum cooling.
Vacuum cooling sucks. The only way to get rid of the heat is via radiation, which is horridly inefficient compared to conduction.
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  #22 (permalink)  
Old 6th July, 2006, 02:46 PM
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Quote:
Originally Posted by Rondog
Not really harder to work with. Just much less abundant than Si.
Harder to work with.

Germanium is more sensitive to process temperatures than silicon.
Germanium by itself has a higher leakage current than silicon.

It does, however, have a smaller band-gap than silicon, which makes it able to switch at considerably higher frequencies. Thus, it has always enjoyed use in applications requiring hi speed as a primary characteristic.
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  #23 (permalink)  
Old 6th July, 2006, 06:08 PM
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I read somewhere that our nerves transmit pulses at about 400 MPH. And we worry that we'll be obsolete? Bah, humscrub.
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  #24 (permalink)  
Old 6th July, 2006, 06:24 PM
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400 MPH? 173mm/nS is about 386,989,979 MPH if my calcuations are correct.
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Last edited by Áedán; 6th July, 2006 at 06:24 PM.
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  #25 (permalink)  
Old 6th July, 2006, 07:03 PM
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Not worry George, I'm a slow thinker to!

"Still waters run deep.":O}
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Last edited by Daniel ~; 6th July, 2006 at 07:04 PM.
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Old 6th July, 2006, 07:32 PM
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Quote:
Originally Posted by Rondog
When you say, upset the leading edge of a signal. Do you mean to say, that at those speeds (while sounding fast) is easily suseptible to interference?
The faster you make a signal go (transition speeds) the harder it is to get a clean signal.

It helps if you think of a signal as having a certain amount of mass to it. Try this experiment:

Take your arm, swing it sideways slowly, and stop it at a specific point.
Now, swing your arm sideways a bit faster, and try to stop it at the same point.
Now, swing your arm as hard as you can, and try to stop it at that point.

As you swing your arm faster, it gets harder and harder to stop it at a specific spot. You tend to overshoot your stopping point and then correct by coming back to it. Odds are, you will do this several times, very quickly, with the error being smaller with each correction until your arm finally comes to rest where you want it.

Now, do the same experiment, but start with your arm over your head and swing it straight down, stopping at shoulder level. Then do it starting with your arm hanging straight down, and swing it straight up, again stopping at shoulder level.

Now, do the same experiement, but pull down against a bungee cord.

Again, you have difficulty stopping at the exact spot you want, but now your arm motion is either working with or against gravity, and either with or against the bugee cord, so that each motion requires a different set of corrections in different directions.

This is akin to the problems that electronic circuits face when trying to send a signal down the wire. Signal rise and fall times (edge rates) vary depending on the amount of capacitance and inductance on the line (rather like gravity and the bungee cord). These result in distortions to the ideal waveshape (a square wave) that we are trying to create, and result in oscillations on the line (the corrections that we make before finally stopping our arms). With fast signal transition times (GHZ) and low voltage levels (like 1.4v), the magniture of correction that occurs (how far you move your arm to correct) can become enough to actually cause the receiving circuit to not be able to tell if you are sending a 0 or a 1. There are ways to correct for this, to a degree, but they require careful attention to detail and even then problems can arise due to things the designer has no control over.

Last edited by Gizmo; 6th July, 2006 at 07:33 PM.
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  #27 (permalink)  
Old 7th July, 2006, 03:09 AM
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Sounds like a pain .
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Old 7th July, 2006, 07:12 PM
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Quote:
Originally Posted by Áedán
400 MPH? 173mm/nS is about 386,989,979 MPH if my calcuations are correct.
Impulses along the human nerve system travel at 386,989,979 MPH? Please.
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Last edited by cloasters; 7th July, 2006 at 07:13 PM.
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  #29 (permalink)  
Old 7th July, 2006, 07:18 PM
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Quote:
Originally Posted by cloasters
Impulses along the human nerve system travel at 386,989,979 MPH? Please.
Eh, no. I think he was saying that the propagation delay for electronic signals was that fast. From memory, it's something on the order of 60% or so the speed of light. Signals travel in the human nervous system at a far slower rate because information is transmitted across the neural gaps using chemical transmitters.
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  #30 (permalink)  
Old 7th July, 2006, 07:43 PM
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So George, your not as deep as you thought! ":O}
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  #31 (permalink)  
Old 13th July, 2006, 11:52 AM
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Ok, so germanium switches faster, ultimately, it all comes down to conductivity then? Why don't we use carbon then? That's dirt cheap, it's what we're made from (mostly), and it conducts electricity well. Of course there's always the issue of how fragile it is. And as for the nervous system, it's faster in the brain than in the rest of the body. For example if you cut your finger, then it can take upto a couple of seconds before you feel the pain. That's because it has to travel from your finger, up your arm, and into your nerve center, which if i'm right, is in your neck. However, if the signal has to travel from your foot, it has to travel a lot further and it's uphill all the way. The nervous system isn't as fast as most people think. However, if it was a processor, it'd be in the region of about 7Ghz.

Also, is it possible to measure a processors speed in MPH?
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  #32 (permalink)  
Old 13th July, 2006, 12:26 PM
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It's not about conductivity per se. Silicon on it's own is a good insulator. It's when you add the dopants that it changes everything. The different configuration of the electrons in the shell of the dopants affects the conductivity.

It's not really valid to compare a nervous system.
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