A Current-Mode TransImpedance Amplifier for Capacitive Sensors

Proceedings

Ferrari, Marco¹  Marcellis, Andrea De²  Nastro, Alessandro³  Ferrari, Vittorio⁴ 

[1] Author to whom correspondence should be addressed.;Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy;Department of Information Engineering, University of Brescia, 25123 Brescia, Italy;Presented at the Eurosensors 2018 Conference, Graz, Austria, 9–12 September 2018.

关键词: transimpedance amplifier;    current conveyor;    capacitive sensors;    MEMS;   

DOI  :  10.3390/proceedings2131033

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

A Current-Mode (CM) TransImpedance Amplifier (TIA) based on Second Generation Current Conveyors (CCIIs) for capacitive microsensor measurements is presented. The designed electronic interface performs a capacitance-to-voltage conversion using 3 CCIIs and 3 resistors exploiting a synchronous-demodulation technique to improve the overall detection sensitivity and resolution of the system. A CM-TIA solution designed at transistor level in AMS0.35 µm integrated CMOS technology with a power consumption lower than 900 µW is proposed. Experimental results obtained with a board-level prototype show linear behavior of the proposed interface circuit with a resolution up to 34.5 fF and a sensitivity up to 223 mV/nF, confirming the theoretical expectations.

【 授权许可】

CC BY