Thanks Russell,

My first electronics job was in semiconductors at Sprague Electric, now=20
Allegro.  If I had stayed on that path in the R&D lab, I might actually=20
understand some of your references and links.  I was looking into a job=20
opp where the company wants someone with low noise analog expertise, and=20
I think it's time for some refreshers.

I signed up for  an Analog Devices  webinar for starters:
<http://www.newark.com/jsp/bespoke/bespoke7.jsp?bespokepage=3Dnewark%2Fen_U=
S%2Flanding%2Fwebinar%2Fadi%2Fadi.jsp>

Joe W



On 6/27/2011 7:14 AM, RussellMc wrote:
>> Is the . dot a multiplication, what I would expect to be '*'?
> Yes, I used "." for std basic multiplication. (No vectors harmed in
> the writing of that formula).
>
> The less keen would build a system and derive K overall from measurement =
:;-)
>
>> It's been too long since studying or using any semiconductor theory.  Is
>> q =3D electron charge a constant?
> A far more profound question than may at first be obvious :-).
>
> A: Only if the fine structure constant is constant and maybe not then.
> If not, the sky is falling and I'm off to see the king. (Does anyone
> want to buy an acorn?).
>
> There is ongoing uncertainty about the constancy of the F.S.C. and
> whether it is spatially isotropic across the universe. But, for we
> mere mortals, it can be assumed that all of the current physical
> constants are so. At least close enough to constant across ranges of
> time and space liable to be encountered in terrestial applications.
>
> FSC =3D alpha =3D 2.Pi.q^2 / (CP)
>
>      q =3D electron charge
>      C =3D light speed !!!!!!!!!!!!
>      P =3D Planck's constant
>
> http://en.wikipedia.org/wiki/Cosmological_principle
>
> They were at it in 1962 :-)
> "The significance of spatial isotropy."
> http://prola.aps.org/abstract/PR/v127/i2/p629_1<- Ref
> http://astrophysics.fic.uni.lodz.pl/100yrs/pdf/07/026.pdf<-paper
>
> http://www.ebtx.com/ntx/ntx215.htm<- Danger Will Robinson
>
> " ...  using the Bekenstein-Sandvik-Barrow-Magueijo (BSBM) theory. ...
> dark energy ..."
> Must be good, then.
> http://arxiv.org/abs/astro-ph/0401631
>
> On Feynman (long ago)&  Webb&  King (2010)  on FSC
> NB FSB<>  FSM but it may sometimes be hard to tell :-).
> http://www.economist.com/node/16930866
>
>
>> I know the rest are, except for the
>> ideality factor, which I would hope are in the spec sheet or can be
>> calculated empirically.
> I doubt if many spec sheets cite non a non-ideality factor, alas.
>
>
>                      Russell
>


--=20
Joe Wronski
Stillwater Embedded Engineering
www.stillwatereng.net

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