[rescue] Re: Drive Reliability (was SCSI drive for sale atbuy.com)

Dave McGuire mcguire at neurotica.com
Thu May 15 00:41:02 CDT 2003

On Thursday, May 15, 2003, at 01:28 AM, Jonathan C. Patschke wrote:
> O   Likely not...those chip packages were around long, long before GaAs
>> chips came into vogue.
> Hm.  I didn't know that.  I guess it's just coincidence that the few
> that I have seen were all GaAs.

   Probably so.

>>    GaAs is still used for ultra-high-speed semiconductors.
> How is it that they can still clock it faster than silicon?  I thought
> the silicon clocks were reaching a physical limitation.  Or is it just
> that GaAs has less resistance than silicon, so it doesn't heat up as
> quickly?

   I don't know much (well, zilch, really) about semiconductor physics, 
so I can't really explain this.  As I understand it, the speed of the 
motion of charge carriers is higher through GaAs...upwards of *twice* 
the speed according to some references.

   This is, of course, a physics thing which cannot be dicked with by 
even the powerful forces of Intel's money or Microsoft's greed.

   The most common application for GaAs semiconductors, though, is in 
small-signal RF circuitry like the front-ends of cell phones and other 
high-sensitivity receivers.  GaAs FETs are much, exhibit much, much 
lower noise figures than silicon FETs.  While GaAs chips are exotic and 
expensive, GaAs FETs in RF circuitry is the norm.


Dave McGuire                "They live deeply, these vagabonds."
St. Petersburg, FL                            -Goro

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