Diode log and antilog circuit derivations 2012-10-15

Here is some basic theory on diode log and antilog circuits and their derivations. Lots of people seem to be interested in this kind of circuit so i thought it would be a good idea to present some useful information on this subject.

I'm starting with the log circuit and as time goes by I'll update with antilog and related circuits and improvements.

THE LOG CIRCUIT DERIVATION
(See Attachment 1 below)

Starting with the diode equation:

[LATEX]i=IS*(e^{(v/(N*VT))}-1)[/LATEX]...

Click to expand...