Re: [sdiy] Temperature stable lin-exp converter with aCA3086or CA3046

[jhaible at debitel.net]

> All free-electron-like metals have the correct tempco. At temperatures 
>above a certain temperature (the Debye temperature) resistivity changes are 
>proportional to T, according to theories by Debye and Einstein.  I have a 
>beautiful figure here from a review article that shows data from Li, Na, 
>Cu, Au and Pb all falling on a single curve (with appropriate 
>material-dependent scaling). Alloys are more complicated, but often have 
>the same linear dependence at high temperature.
>
>Don't trash your Q81s!
>
>   Ian

Very interesting - I didn't know that!
Which raises the question about the tempco of these metals approximately compensating the
tempco of a silicon pn junction. Is this just coincidence, or is there a system in it?
(To think of it, I don't even know if other semiconductors, Ge, GaAs, etc., have the same
tempco or not.)

JH.