Development of an Optimized Single-Slope Analog-to-Digital  Converter Readout Circuit for Gas Sensing Systems

Jang-Su  Hyeon; Hyeon-June Kim

doi:10.23075/jicas.2025.11.3.004

Jang-Su Hyeon Seoul National University of Science and Technology
Hyeon-June Kim Seoul National University of Science and Technology

DOI: https://doi.org/10.23075/jicas.2025.11.3.004

Keywords: Gas sensor, readout integrated circuit (ROIC), single-slope analog-to-digital conversion (ADC), slow response gas sensing system

Abstract

This paper presents the design and implementation of a readout integrated circuit (ROIC) optimized for gas sensor applications. The proposed ROIC integrates essential components, including a ramp generator, digital DDR counter, comparator, and peripheral bias generation blocks, to ensure accurate signal processing. The ROIC achieves a power consumption of 1.31 mW and operates with a 1.2V input range, achieving a 62.5 kHz conversion rate and a performance of 9.41 bits effective number of bits (ENOB). Additionally, the figure of merit (FoM) of the system is measured at 30.81 pJ/step. The results indicate that the proposed ROIC provides a robust solution for high-precision gas sensing systems, demonstrating its potential to significantly enhance the performance of sensor-based applications, particularly in environments that require fast and accurate measurements. The chip, fabricated using TSMC 180nm CMOS technology, shows promise for real-world applications in industrial and environmental monitoring.

Author Biographies

Jang-Su Hyeon, Seoul National University of Science and Technology

Jang-Su Hyeon received the B.S. and M.S. degrees from the Department of Electronics Engineering, Kangwon National University, Samcheok, South Korea, in 2021. He is currently pursuing the Ph.D. degree in electronic engineering with the Department of Semiconductor Engineering, Seoul National University of Science and Technology, Seoul, South Korea, since 2023. His current research interests include mixed-signal integrated circuits, algorithmic data converters, and intelligent gas sensor systems.

Hyeon-June Kim, Seoul National University of Science and Technology

Hyeon-June Kim received the B.S. degree from the Kumoh National Institute of Technology, Gumi, South Korea, in 2010, and an M.S. and Ph.D. degrees from the Korea Advanced Institute of Science and Technology, Daejeon, South Korea, in 2012 and 2017, respectively. In 2017, he joined SK Hynix, Icheon, South Korea, where he worked on the product development of commercial CISs. From 2020 to 2023, he was with the Department of Electronics Engineering, Kangwon National University, Samcheok, South Korea, as an assistant professor. He has been with the Department of Semiconductor Engineering, Seoul National University of Science and Technology, Seoul, South Korea, since 2023, where he is currently an associate professor. His current research interests include low-power mixed-signal ICs, RF ICs, CMOS image sensors, neuromorphic sensors, gas sensors, and object detection sensor systems.

Homepage : https://issl.seoultech.ac.kr/

Development of an Optimized Single-Slope Analog-to-Digital Converter Readout Circuit for Gas Sensing Systems

Abstract

Author Biographies

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