Exp converters (silly idea?)

[Thierry Rochebois]

Just a (maybe) silly idea.

As the discharge curve of a capacitor is an A*exp(-t/tau),
maybe, it is possible to calculate an exp thanks to it with the
help of a linearly discharging capacitor (constant current) figuring -t
and comparing -t with the input. The comparator would trigger a
sample and hold and output the A*exp(-t/tau).

Kind regards,

Thierry Rochebois
DSP engineering
Canam Computers  (Quartz D2D softwares)
http://www.canamcomputers.com