Parametric analysis of galvanostatic type impedance measuring front-end

The basic approaches of parametric analysis of impedance measuring front-end on the base of SPICE modeling are considered in paper. The method for impedance analysis using the mathematical functions of real Re and imaginary Im signal components is applied. By means of this functions it is possible to investigate the frequency dependences of the corresponding values of the active ReZ and the reactive ImZ impedance, and, thus, to plot the Nyquist diagram. In this article, the galvanostatic measurement method is used, which is on the base of the determination of the ratio and phase delay between the voltage and the harmonic current with the specified amplitude and frequency. As a result of simulation, the possibility of significant increase of the measurement transformation accuracy is found by means of modifying the input circuits of the impedance measuring front-end.