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Current-Mode Capacitive Sensor Interface Circuit With Single-Ended to Differential Output Capability

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3 Author(s)
Tajeshwar Singh ; Dept. of Electron. & Telecommun., Norwegian Univ. of Sci. & Technol. (NTNU), Trondheim, Norway ; Trond Saether ; Trond Ytterdal

This paper presents a current-mode interface circuit for capacitive sensors, with the main features being its ability to produce a differential output from a single-ended sensor (using a fixed reference capacitor) and its simplicity in realization. These advantages make it a potential candidate for applications where differential sensors are not available and where a simple design is required. The principle is, however, easily applicable to differential sensors as well. The interface concept can be realized in different ways; however, to present a proof of concept on silicon, a prototype has been fabricated and tested in a commercially available 0.8-mum CMOS process. The circuit has been designed using common analog building blocks such as a fully differential operational transconductance amplifier (OTA), a high-output-resistance wide-swing current source, and a single clock phase. The estimated linearity error was 0.2% relative to full-scale swing with a simple two-point calibration. The circuit consumes 145 muA from a 5-V power supply.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:58 ,  Issue: 11 )