4.7 Article

A Wide Dynamic Range Multi-Sensor ROIC for Portable Environmental Monitoring Systems With Two-Step Self-Optimization Schemes

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2021.3065503

Keywords

Environmental monitoring; multi-sensor; ROIC; electrochemical; semiconductor-type; current sensing; resistance sensing; Delta Sigma current detector; self-optimization

Funding

  1. Institute of Information & Communications Technology Planning & Evaluation (IITP) [2018-0-00756]
  2. 2018 R&D support project based on the science and technology [REDE 2018 US 001]
  3. Ministry of Education, South Korea [2017M1A2A2087833, 2020R1A6A1A03040570]
  4. Samsung Electronics
  5. National Research Foundation of Korea - Ministry of Science and ICT

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This study introduces a wide-dynamic-range multi-sensor readout interface for portable environmental monitoring systems, optimizing current and resistance detection performance through two-step self-optimization. The ROIC prototype, fabricated in a 180-nm CMOS process, achieves high dynamic range and signal-to-noise ratio, successfully supporting wireless air quality and water pollution monitoring.
This article presents a wide-dynamic-range multi-sensor readout interface for portable environmental monitoring systems with two-step self-optimization schemes. It proposes two-step self-optimization methods of adaptive range detection and coarse self-cancelation (CSC) for current-type sensor interfaces, and range-based path control and current DAC-based correlated double sampling (CDS) for resistive sensing interfaces. Their digital conversions are provided by two kinds of high-resolution ADCs, namely, an incremental Delta Sigma current detector and a two-step SAR- Delta Sigma ADC. The proposed ROIC prototype is fabricated in a 180-nm CMOS process, achieving a dynamic range (DR) of 136.5 dB and 160.9 dB, and a maximum SNR of 109.8 dB and 108.6 dB for current and resistance detection, respectively. For system-level feasibility, an environmental monitoring system prototype based on the ROIC is also manufactured and functionally verified by integrating two kinds of in-house microelectro-mechanical systems (MEMS) sensor devices, the MCU, and the Bluetooth module, supporting wireless air quality and water pollution monitoring capabilities.

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