DIFFERENTIAL_LOGARITHM

Published:2009/7/14 4:02:00 Author:May | From:SeekIC

Optical Electronics 9818 opamp and 2245C logamp together give logarithm of differential input voltage or current. Combined transfer function is E0 = K log (R2 /R1 ) (e2- e1). R1 can be zero for differential input current circuit. For unity-gain preamp, R1 and R2 should be 10K. For 1-V full-scale Input, use 10K for R1 and 100K for R2, For l00-mV fullscale input, use 10K for R1 and 1 megohm for R2.- How to Obtain a Differential Logarithm, Optical Electronics, Tucson, AZ, Application Tip 10126.



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