[sdiy] Temperature compensating capacitors

[René Schmitz]

Hi Neil and all,

Am 06.05.2014 12:01, schrieb Neil Johnson:
> cheater00 wrote:
>> has anyone tried using tempco capacitors in their designs?
>> http://www.capaxtechnologies.com/pdffiles/TemperatureCompCaps.pdf‎
>
> Curve 'T' looks closest to compensate for an expo.
> Any idea what availability and pricing is like?

I can't see how a changing capacitance would be able to correct for the 
scale factor temperature dependancy?
The depencancy for T is inside the argument of an exp() function, but 
the caps tempco would act only on the outside as a factor.

I could image these might be useful to compensate some tuning drift, if 
the scale factor was compensated by some other means. But then again a 
PTAT sensor does the same.

Cheers,
  René