Title :
An ultra-low-power front-end for differential capacitive sensors
Author :
Kongpark, Patcharee ; Mailly, Frederick ; Latorre, Laurent ; Nouet, Pascal
Author_Institution :
Univ. of Montpellier, Montpellier, France
Abstract :
In this paper, we present a simple, compact and low-power interface for differential capacitive sensors with direct digital output. The complete system is composed with a current to voltage amplifier, an integrator, a comparator and a feedback capacitor connected in parallel with one of the two capacitances. Overall a Sigma-Delta modulator is obtained that is able to deliver directly a bit stream proportional to the differential capacitance.
Keywords :
analogue-digital conversion; capacitive sensors; comparator circuit; current-voltage amplifier; differential capacitance; differential capacitive sensors; direct digital output; feedback capacitor; integrating circuit; low power interface; sigma-delta modulator; ultralow power front-end; Bridge circuits; Capacitance; Capacitive sensors; Capacitors; Modulation; Noise;
Conference_Titel :
Design, Test, Integration and Packaging of MEMS/MOEMS (DTIP), 2015 Symposium on
Conference_Location :
Montpellier
Print_ISBN :
978-1-4799-8627-9
DOI :
10.1109/DTIP.2015.7160964
