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RC Wheatstone Bridge using INA331

Question asked by MichaelFM on Apr 15, 2013
Latest reply on Apr 15, 2013 by AndyR



I am experimenting with an RC Wheatstone Bridge with the intention of measuring the change in capacitance in a sensor. The bridge is excited using a sine wave with a dc offset of 2.5v. Attached is the schematic of my implementation so far.


I am reasoning out that at the output of the INA331 should be the difference of nodes A and B multiplied by 5. However I am getting a totally unexpected result. Does anyone here notice anything wrong with the circuit. I am guessing that I am missing something!!


Thanks for your help.