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Capacitive microsensors such as accelerometers, gyroscopes, and pressure sensors are increasingly used in the modern electronic world. However, the invivo use of capacitive sensing for measurement of pressure or other variables inside a human body suffers from significant errors due to stray capacitance. This article proposes a solution consisting of a transparent thin flexible Faraday cage that surrounds...
This study describes a novel circuit configuration, capable of handling fast transients and small capacitance changes by the evaluation of the signals of a capacitive sensor network. The circuit is based on a conventional bridge measurement method being complemented with a control loop and high-order filters in order to cancel the effect of the environmental interference, the in-circuit noise, the...
The paper presents an interface circuit for capacitive sensors that are shunted by a parasitic leakage conductance and which are grounded at one of their electrode terminals. The electronic circuit is designed based-on the use of a relaxation oscillator. In the designed interface, the effect of shunting conductance is reduced by using the charge/discharge-balanced method. The parasitic effects of...
A high accuracy sigma-delta capacitance to digital converter (CDC) that accepts differential capacitive sensors possessing either linear or inverse characteristic and provides a linear digital output is presented here. The sensor capacitances become an integral part of the delta modulator in a sigma-delta digital converter, with the switching sequenced to eliminate the effects of stray capacitances...
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