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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...
A novel differential synchronous demodulator is presented that uses the on-off switching characteristic of the power supply in autonomous systems as control signal for demodulation. The proposed circuit, which uses a single op amp and SPDT switch, can be useful in sensors networks or distributed data acquisition systems involving ac sensors or impedance measurements. A prototype demodulator yields...
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