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 n/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.
1. Bo Cheng, Da Zhu, Shuai Zhao, Junliang Chen. Situation-Aware IoT Service Coordination Using the Event-Driven SOA Paradigm // IEEE Transactions on Network and Service Management. — 2016. Vol. 13, Issue 2. — P. 349–361. 2. Chonggang Wang, Mahmoud Daneshmand, Mischa Dohler. Guest Editorial — Special Issue on Internet of Things (IoT): Architecture, Protocols and Services // IEEE Sensors Journal. — 2013. — Vol. 13, Issue 10. — P. 3505–3510. 3. Maria L. Lopez Rodriguez, Rossana Madrid, Carla Giacomelli. Evaluation of Impedance Spectroscopy as a Transduction Method for Bacterial Biosensors // IEEE Latin America Transactions. —2013. — Vol. 11, Issue 1. — P. 196–200. 4. Kiseok Song, Unsoo Ha, Seongwook Park. An Impedance and Multi-Wavelength Near-Infrared Spectroscopy IC for Non-Invasive Blood Glucose Estimation // IEEE Journal of Solid-State Circuits. — 2015. — Vol. 50. — Issue 4. — P. 1025–1037. 5. Z. Hotra, R. Holyaka, T. Marusenkova, J. Potencki. Signal transducers of capacitive microelectronic sensors // Electronika. Rzeszow. Poland. — 2010. — Nо. 8. P. 129–132. 6. Z. Hotra, R. Holyaka. Structural and circuit design for enhancement of thermal flow sensors effectiveness // Advanced Numerical Modeling. IIPhDW. — 2011. Zielona Gora. Poland. — P. 129–130. 7. Roman Holyaka, Natalya Kostiv. Energy-efficient signal converter of thermocouple, temperature sensors. Informatyka, Automatyka, Pomiary. — 2011. — № 4 — P. 26–28. 8. R. Holyaka, I. Yurchak, T. Marusenkova, V. Ilkanych.Microprocessor noise-immune signal transducer for galvanomagnetic smart sensor devices // Modern Problems of Radio Engineering, Telecommunications and Computer Science. Proceedings of the 11th International Conference. TCSET’2012. — 2012. P. 34–35. 9. Jaeho Kim, Jaeseok Yun, Sung-Chan Choi. Standard-based IoT platforms interworking: implementation, experiences, and lessons learned // IEEE Communications Magazine. —2016. Vol. 54, Issue 7. — P. 48–54. 10. Aparna M. Dhirde, Nilesh V. Dale, Hossein Salehfar. Equivalent Electric Circuit Modeling and Performance Analysis of a PEM Fuel Cell Stack Using Impedance Spectroscopy // IEEE Transactions on Energy Conversion. — 2010. — Vol. 25, Issue 3. — P. 778–786. 11. David Karpaty. Modeling Amplifiers as Analog Filters Increases SPICE Simulation Speed // Analog Dialogue. http://www.analog.com/analogdialogue. — 2013. — Vol. 47. — Nо. 1. — P. 18–22. 12. MICRO-CAP. Electronic Circuit Analysis Program. Spectrum Software. — 2014. — 8 p. [Електронний ресурс]: Режим доступу: http://www.spectrum-soft.com.