title: A Reconfigurable Readout Integrated Circuit for Heterogeneous Display-Based Multi-Sensor Systems.
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.
authors.affiliation: School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea. khpark@unist.ac.kr.
authors.forename: Kyeonghwan
authors.initials: K
authors.lastname: Park
authors.affiliation: School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea. nailmong@unist.ac.kr.
authors.forename: Seung Mok
authors.initials: SM
authors.lastname: Kim
authors.affiliation: School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea. avella@unist.ac.kr.
authors.forename: Won-Jin
authors.initials: WJ
authors.lastname: Eom
authors.affiliation: School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea. jaejoon@unist.ac.kr.
authors.forename: Jae Joon
authors.initials: JJ
authors.lastname: Kim
keywords: alternate sampling ADC; body impedance; electrocardiogram; environment sensors; heterogeneous multi-sensor functions; reconfigurable readout; touch sensor