An Accurate Period-Modulator-Based Interface for Grounded Capacitive Sensors

چکیده مقاله

This paper presents a high precision capacitance to digital converter CDC based on period modulation PM for grounded capacitive sensors With a symmetrical design, the performance of the CDC is significantly improved by applying zoom in and auto calibration techniques The nonidealities of the CDC circuit which are mainly caused by charge injection of switches and associated parasitic effects is reduced by utilizing dummy switches at asymmetrical paths of the applied auto calibration The proposed interface is designed as an integrated circuit using a standard 0 18μm CMOS technology A worst case capacitance error less than 0 2fF for a 10pF sensor capacitor with maximum variation of 200fF, and parasitic capacitance of up to 20pF is obtained The achieved latency is 125μs and the CDC consumes 170μA from a 2V power supply

کلیدواژه‌ها

نویسندگان

M Karimi

Department of Electronic Engineering, University of Guilan, Rasht, Iran

A Heidary

Department of Electronic Engineering, University of Guilan, Rasht, Iran

M Dehban

Department of Electronic Engineering, University of Guilan, Rasht, Iran

Karimi, M and Heidary, A and Dehban, M,1398,An Accurate Period-Modulator-Based Interface for Grounded Capacitive Sensors,Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy,Tehran

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مجموعه مقالات ششمین کنگره ملی تازه های مهندسی برق و کامپیوتر ایران با نگاه کاربردی بر انرژی های نو12 اردیبهشت 1398 · تهران