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Title An Energy-Efficient Reconfigurable Interface for Resonant Sensors Based On Ring-Down Measurement
Publication Date
Degree Level masters
University/Publisher Delft University of Technology

This thesis discusses the theory, architecture design, circuit design and measurements of an ultra-low-energy reconfigurable interface circuit for resonant gas sensors. This interface circuit employs a transient measurement method. The resonant sensor is driven at a frequency close to its resonance frequency by an excitation source that is intermittently disconnected, causing the sensor to oscillate at its resonance frequency with an exponentially-decaying amplitude. From the associated ring-down signal, the frequency of the freely-oscillating sensor and its quality factor are obtained by means of a counting technique. A prototype readout circuit that senses the ring-down signal and performs the required level-crossing detection has been fabricated in a standard 0.35-?m CMOS technology. The experimental results obtained using this prototype in combination with samples of micro-machined clamped-clamped beam resonators show good consistency with the resonance frequency and quality factor obtained using conventional impedance analysis. Compared to prior implementations, the realized prototype is less sensitive to leakage currents, enabling a shorter measurement time, and provides a reconfigurable front-end circuit that allows it to be connected to resonators with different parameters. The circuit consumes an energy of 207.9nJ per measurement.


Microelectronics & Computer Engineering

Electrical Engineering, Mathematics and Computer Science

Subjects/Keywords energy-efficiency; sensor interfacing; resonant sensors; reconfigurability
Contributors Pertijs, M.A.P. (mentor)
Language en
Rights (c) 2013 Yan, Y.
Country of Publication nl
Record ID oai:tudelft.nl:uuid:e98b4e14-4453-4103-9ef1-03f3176ac0c7
Repository delft
Date Retrieved
Date Indexed 2020-06-19

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