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Sensors 2017, 17(4), 759; doi:10.3390/s17040759

A Reconfigurable Readout Integrated Circuit for Heterogeneous Display-Based Multi-Sensor Systems

School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea
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Received: 6 February 2017 / Revised: 19 March 2017 / Accepted: 31 March 2017 / Published: 3 April 2017
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents a reconfigurable multi-sensor interface and its readout integrated circuit (ROIC) for display-based multi-sensor systems, which builds up multi-sensor functions by utilizing touch screen panels. In addition to inherent touch detection, physiological and environmental sensor interfaces are incorporated. The reconfigurable feature is effectively implemented by proposing two basis readout topologies of amplifier-based and oscillator-based circuits. For noise-immune design against various noises from inherent human-touch operations, an alternate-sampling error-correction scheme is proposed and integrated inside the ROIC, achieving a 12-bit resolution of successive approximation register (SAR) of analog-to-digital conversion without additional calibrations. A ROIC prototype that includes the whole proposed functions and data converters was fabricated in a 0.18 μm complementary metal oxide semiconductor (CMOS) process, and its feasibility was experimentally verified to support multiple heterogeneous sensing functions of touch, electrocardiogram, body impedance, and environmental sensors. View Full-Text
Keywords: heterogeneous multi-sensor functions; alternate sampling ADC; reconfigurable readout; touch sensor; environment sensors; electrocardiogram; body impedance heterogeneous multi-sensor functions; alternate sampling ADC; reconfigurable readout; touch sensor; environment sensors; electrocardiogram; body impedance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Park, K.; Kim, S.M.; Eom, W.-J.; Kim, J.J. A Reconfigurable Readout Integrated Circuit for Heterogeneous Display-Based Multi-Sensor Systems. Sensors 2017, 17, 759.

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