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AD8302 impedance measurement

Question asked by Christoph on Aug 25, 2014
Latest reply on Aug 27, 2014 by BobC



I would like to use the AD8302 for an impedance measurement application. The 2 input voltages for the AD8302 are the excitation voltage for the DUT and the response voltage (proportional to the current through the DUT). With the AD8302 I would like to build the ratio of the magnitude and the phase diff. between the 2 voltages, followed by an ADC, and so calculate the impedance of the DUT.  The frequency range for impedance measurement should cover 10Hz to 10 MHz.


So my questions are:

  • Would this application basically work with the AD8302?
  • Is it possible to calculate phase diff. and magnitude ratio for the whole frequency range?
  • Could you recommend me other devices from analog devices which would fit for my application?


Thanx a lot