temperature compensation.

[>>>marjan<<<]

> Above you swapped NTC for PTC. The tempco resistor in the ASM is a PTC.

Hi list,

I was reading EDN online article "Active Cancellation Of Potentiometer
Wiper Resistance" (June 14) and it says "... the FETs' Ron temperature 
coefficients approach 3000 ppm/°C--five to ten times worse than typical 
resistance elements", the fact that I must have skipped during 
analog electronics lectures.
So just a long shot, if you bias FET to open with some constant
voltage and put it in voltage divider, could it make some sort of
tempco, with some trimming to exact volt. div? Is it linear or not? 
What's typical FET Ron resistance (~100ohm?)
Bad idea? 



marjan