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

Conference Paper (2018)
Author(s)

G. Vlachogiannakis (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Z. Hu (TU Delft - Electrical Engineering, Mathematics and Computer Science)

H. Thippur Shivamurty (TU Delft - Electrical Engineering, Mathematics and Computer Science)

A. Neto (TU Delft - Electrical Engineering, Mathematics and Computer Science)

M.A.P. Pertijs (TU Delft - Electrical Engineering, Mathematics and Computer Science)

L.C.N. de Vreede (TU Delft - Electrical Engineering, Mathematics and Computer Science)

M. Spirito (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Research Group
Electronics
DOI related publication
https://doi.org/10.1109/IMBIOC.2018.8428950 Final published version
More Info
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Publication Year
2018
Language
English
Related content
Research Group
Electronics
Article number
8428950
Pages (from-to)
1-3
ISBN (print)
978-1-5386-5919-9
ISBN (electronic)
978-1-5386-5918-2
Event
2018 IEEE/MTT-S International Microwave Biomedical Conference, IMBioc 2018 (2018-06-14 - 2018-06-15), Philadelphia, United States
Downloads counter
196

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.