[sdiy] Temperature stable lin-exp converter

[Tim Ressel]

Yeah, it'd have to be on the same die to really work.
So the ol' CA3046 or MAT0x or whatever is called for.

--TR

--- jorgen.bergfors at idg.se wrote:
> 
> >If one were to
> >take a third transistor and run a constant current
> >through it, the Vbe would vary with temperature.
> You
> >could then amplify the Vbe to a useful level and
> >polarity, and inject it into the summing node of
> the
> >expo converter input. I think this would give the
> >needed temp compensation. What do you think folks?
> 
> Does the third tranny need to be matched? Or is it
> enough that it is
> thermally coupled to the other two?
> 
> /Jorgen
> 
> 


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