Journal ArticleDOI
A Wide Dynamic Range Multi-Sensor ROIC for Portable Environmental Monitoring Systems With Two-Step Self-Optimization Schemes
Subin Choi,Chan Sam Park,Hee Young Chae,Byungjoo Oh,Jongmin Lee,Yeong Min Kwon,Jeong Min Baik,Heungjoo Shin,Jae Joon Kim +8 more
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TLDR
A wide-dynamic-range multi-sensor readout interface for portable environmental monitoring systems with two-step self-optimization schemes of adaptive range detection and coarse self-cancelation and range-based path control and current DAC-based correlated double sampling (CDS) for resistive sensing interfaces is presented.Abstract:
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 micro-electro-mechanical systems (MEMS) sensor devices, the MCU, and the Bluetooth module, supporting wireless air quality and water pollution monitoring capabilities.read more
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A 96.9-dB-Resolution 109-μW Second-Order Robust Closed-Loop VCO-Based Sensor Interface for Multiplexed Single-Ended Resistance Readout in 180-nm CMOS
TL;DR: In this paper , the authors present a highly digital robust voltage-controlled oscillator (VCO)-based front end for multiplexed single-ended resistive sensor readout applications, which enables second-order noise shaping without any operational transconductance amplifiers (OTAs) and a single feedback digital-to-analog converter (DAC).
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A 96.9-dB-Resolution 109-μW Second-Order Robust Closed-Loop VCO-Based Sensor Interface for Multiplexed Single-Ended Resistance Readout in 180-nm CMOS
TL;DR: In this article , the authors present a highly digital robust voltage-controlled oscillator (VCO)-based front end for multiplexed single-ended resistive sensor readout applications, which enables second-order noise shaping without any operational transconductance amplifiers (OTAs) and a single feedback digital-to-analog converter (DAC).
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