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AD5933 in 4-electrodes configuration

Question asked by JohnJrW on Aug 27, 2015
Latest reply on Sep 1, 2015 by mcee



I have successfully designed and implemented AD5933-based impedance measurement system (according to the CN-0217). It works fine in measurement range 100 Ohms - 500 KOhms, which is just fine for me.

Now I would like to perform some bioimpedance measurements and for that, 4-electrodes configuration is requested.

I have no previous experience with VCCS design and I hope that someone can help me. Probably, the most suggested circuit is Howland's... I need help how to meet requirement that maximum extrication current is bellow 800uA (due to the safety reasons).


Any suggestions?