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Synchronous Demodulator for Autonomous Sensors

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5 Author(s)
Casanella, R. ; Tech. Univ. of Catalonia, Barcelona ; Casas, O. ; Ferrari, M. ; Ferrari, V.
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In this paper, a novel differential synchronous demodulator is presented that uses the on-off switching characteristic of the power supply in autonomous systems as the control signal for demodulation. The proposed circuit, which uses only an op amp and a double-pole double-throw switch, can be useful in sensor nodes for sensor networks or distributed data-acquisition systems involving ac sensors or impedance measurements. Three prototype demodulators have been implemented using op amps with different power-bandwidth characteristics, and their common-mode rejection ratio (CMRR), nonlinearity, and initial transient were characterized. The working of the circuit when supplied by a piezoelectric energy converter is also verified.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:56 ,  Issue: 4 )