A Compact Energy Efficient CMOS Permittivity Sensor Based on Multiharmonic Downconversion and Tunable Impedance Bridge

Conference paper (2018)

Authors

G. Vlachogiannakis Electronics -

Z. Hu Electronics -

H. Thippur Shivamurthy Electronics -

A. Neto Tera-Hertz Sensing -

M.A.P. Pertijs Electronic Instrumentation -

L.C.N. de Vreede Electronics -

M. Spirito Electronics -

Research Group

Electronics () (TU Delft)

Sensitivity Permittivity Near field Wearable sensors Bridge circuits Chemical and biological sensors Microwave sensors

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http://resolver.tudelft.nl/uuid:6bd33e7a-b99d-4338-9938-230c4fee1ffc

Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronics

Abstract

This paper presents a 0.15×0.3 mm2 complex permittivity sensor integrated in a 40-nm CMOS node. A single-ended patch, employed as a near-field sensing element, is integrated with a double-balanced, fully-differential tunable impedance bridge that is driven by a square RF pulse. The multi-harmonic, interme-diate-frequency down-conversion architecture achieves a compact form factor and fast multi-frequency readout. Measurement results show good agreement with theoretical values and the measured relative permittivity variation remains below 0.3 over a 0.1-10 GHz range at a 1-ms measurement time. The energy efficiency resulting from the fast measurement time and the record-small active area allows integration in battery-operated wearables.

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