analog solutions on FL?

techuna@ibm.net
Mon, 30 Sep 1996 11:44:20 +0100


Hello,

For a course on FL I'm looking for a simple FL control.
I'm especially interested in analog alternatives.

In a book I found following schematic to realise a MIN operation
in the rule part of a FL expert system.

The MIN operation: MIN(in1, in2)=out

+----+- +Vdd
| |
- |
R1| | |
- |
| /
+-----------+----+--| Q3
| | \
/ / |-->- out
in1 ->-| Q1 in2 ->-| Q2 -
\ \ R2| |
| | -
| | |
+-----------+---------+- -Vss
Q1-3:pnp BJT

MAXing the rules could be done in a simalar way (npn BJT)
I wander if there are any smart analog solutions for the fuzzification
and defuzzification (centroid). The fuzzification part would be easily
build using OpAmps, I guess. Does anybody know of such circuit, or a
good book where an analog fuzzy controler in described?

Practice makes perfect, doesn't it?

Thanks in advance,

Ewout
______________________________________________________________________
E.W. Buhler, dpt. Electrical Engineering

University of the Netherlands Antilles
Jan Noorduynweg 111
Curacao, Dutch Carribean

or by e-mail: techuna@ibm.net
______________________________________________________________________