Nueva publicación: “High-Linearity Front-End Circuit for Remote Grounded Capacitive Sensors”
M. A. Haberman, E. M. Spinelli and F. Reverter, “High-Linearity Front-End Circuit for Remote Grounded Capacitive Sensors,” in IEEE Transactions on Instrumentation and Measurement, vol. 70, pp. 1-8, 2021, Art no. 2003108, doi: 10.1109/TIM.2021.3055829.
Abstract:This article presents a novel front-end circuit for remote grounded capacitive sensors. The circuit is insensitive to amplifier input capacitance and stray interconnecting-cable capacitances. It does not rely on neutralization or compensation techniques that require manual adjustments and high-accuracy reference components. The proposed solution reduces the circuit input capacitance below a few femptofarads using a simple but properly shielded custom transformer. In addition, the circuit keeps a nonlinearity error below 0.01% when measuring capacitances of units or tens of picofarad, even with up to 12-m interconnecting cables.
