Spice model of quadrature synchronous detectors for impedance measuring transducer

Barylo G., Virt V., Holyaka R., Hotra Z.

Lviv Polytechnic National University

Abstract: 
The task of impedance measurement transducers’ SPICE simulation is presented. Wide range of impedance spectroscopy microelectronic sensors, namely, for Internet of things, are based on such measurement transducers. One of the attractive aspect of impedance spectroscopy as a tool for investigating is the direct connection that often exists between the behavior of a real system and that of an idealized model circuit consisting of discrete electrical components. The paper describes the approach to Nyquist impedance plot calculation using SPICE models based on quadrature synchronous detectors. Based on AC analysis and Transient analysis combination a SPICE model and a technique for parametric analysis of impedance spectroscopy devices’ quadrature synchronous detectors are proposed. Nominal values of impedance, namely its real ReZ and imaginary ImZ parts, are calculating using the SPICE models AC analysis. On the contrary, caused by factual parameters of signals and transducer circuit components the factual real and imaginary parts values of impedances are calculating using the SPICE model Transient analysis. A signal of impedances real part is detecting and integrating inphase with driving wave, namely, the sinusoidal current wave through object to be measured, while a signal of imaginary part is detecting and integrating with /2 phase shift. Both of AC and Transient analysis combination and its data comparison is the key solution to further optimization and parameters improvement of impedance measurement transducer circuits.
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