Solid State Physics. I will check it out. I believe it
is VERY heavy of theoratical stuff. 

Thanks,
John

--- William Chops Westfield <westfw@mac.com> wrote:

> 
> On Sep 22, 2006, at 11:57 AM, Forrest W. Christian
> wrote:
> 
> >
> >> I already have that. Still does not give me the
> depth
> >> I want on semiconductor theory:( Theory of the
> >> behavior of the silicon for a given environment
> or
> >> operation.
> >>
> > I'm not aware of any book which specifically deals
> with that
> 
> Yeah, semiconductor theory tends to start deep in
> theory and doens't
> quite get up to the "practical" level of things like
> power dissipation.
> Manufacturer literature starts way up with the
> practical limits and
> never gets down to their theoretical causes.
> 
> IIRC, at least some of the current limits are
> related to things
> like the carrier density, ohmic resistance of
> contacts, junctions,
> and channels, and so on.  Some of that will be
> covered in solid
> state physics texts; I see a bunch of stuff that I
> don't understand
> any more in my college copy of "Solid State
> Electronic Devices" by
> Streetman (c  1972, so...)  The practical aspects
> may be deep company
> I.P., some secret, some patented.  High power
> mosfets seem to commonly
> be a bunch of parallel devices in a single package,
> for instance.
> 
> If you think of the maximum current as being imposed
> by the
> solid state physics of the internal device, while
> the power
> rating is determined by needing to maintain a
> temperature where
> the solid state physics still applies (even before
> wires melt,
> I seem to recall that temperature has assorted
> effects on carrier
> mobility and such), you won't be TOO far wrong. 
> It's also possible
> that a device was fabricated and then measured, and
> what you see
> in the spec sheet is the max current where the
> device behaved in
> a way that the company wanted to take credit for (ie
> it is at least
> partially derived experimentally.)
> 
> BillW
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