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

Choi, Subin; Park, Chan Sam; Chae, Hee Young; Oh, Byungjoo; Lee, Jongmin; Kwon, Yeo‐Jung; Baik, Jeong Min; Shin, Heungjoo; Kim, Jae Joon

doi:10.1109/tcsi.2021.3065503

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…Other than that, [10] and [13] show versatile solutions which could potentially handle sensors from Table 1, but the adaption of voltage and sample rate would require substantial design changes, trade-offs and potentially higher power consumption. The AFE from [9] offers a comparable level of functionality and sensor adaptability, but shows almost fifty times higher power consumption than the proposed AFE.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…On the load side, analog frontends (AFEs), integrated in complete system-on-chips (SoCs) and operating at very low supply levels below 1 V with power consumption in the range of several nanowatts, have been reported for dedicated (proprietary) biomedical sensors [6], [7]. In order to operate available sensor devices, environmental sensing applications demand typically higher voltage levels and wider frequency ranges, which results ultimately in a power demand towards several microwatts [8], [9], [10]. An environmental sensing AFE targeting ULP consumption of maximum 10 µW is therefore one challenging key part for the implementation of a harvester-powered autonomous long-life SN.…”

Section: Introductionmentioning

confidence: 99%

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Flexible Multi-Channel Analog-Frontend for Ultra-Low Power Environmental Sensing

Jotschke

Reichel

Ossa

et al. 2021

IEEE Open J. Circuits Syst.

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The trend towards ubiquitous electronics drives the development of autonomous hardware components with longer operating times. This work presents a novel ultra-low power analog sensor frontend (AFE) for environmental sensing applications. Relevant operation parameters like resolution (6 to 13 bit), sample rate (1 to 7.5 kS/s), voltage gain (−6 to 12 dB), transimpedance (1.5 to 12 M ), and moving average (1 to 128 taps) are real-time programmable. Four input channels are separately configurable to process voltage, current and potentiometric signals of external or internal sources. The flexible channel-wise configuration enables processing of various signal types and therefore offers a versatile solution for sensors from the Internet-of-Things (IoT) market segment. The AFE integrates switched-capacitor amplifiers, 13 bit, 10 kS/s successive approximation analog-to-digital converter (SAR ADC), bias references, oscillator, digital signal pre-processing and communication in a system-on-chip. A novel sensor power regime supports the flexible read-out of commercial IoT sensors, resulting in excellent power consumption. Fabricated samples in 180 nm technology show an ultra-low power consumption of 8.8 µW. The SAR ADC achieves 10.6 effective bits while consuming 1.8 µW, resulting in a Figure-of-Merit of 116.0 fJ/conv.-step. Measurements with commercial sensors prove the AFE's suitability for an energy-harvester-powered IoT environmental sensor node.

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Section: Measurement Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible Multi-Channel Analog-Frontend for Ultra-Low Power Environmental Sensing

Jotschke

Reichel

Ossa

et al. 2021

IEEE Open J. Circuits Syst.

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show abstract

“…As a conventional readout topology, most commercial chemoresistive gas sensors are based on a voltage-divider structure [ 11 ] for resistance-to-voltage conversion because it provides a wide dynamic range of the sensor resistance. In addition, to remove the initial value of gas sensors (i.e., gas sensor offsets), a differential amplifier and Wheatstone bridge circuit [ 12 , 13 , 14 ] are utilized to obtain only the amount of change of the gas sensor output with a fixed proper reference voltage.…”

Section: Introductionmentioning

confidence: 99%

Chemoresistive Sensor Readout Circuit Design for Detecting Gases with Slow Response Time Characteristics

Lee

Byun

et al. 2022

Sensors

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Based on an analysis of the signal characteristics of gas sensors, this work presents a chemoresistive sensor readout circuit design for detecting gases with slow response time characteristics. The proposed readout circuit directly generates a reference voltage corresponding to the initial value of the gas sensor and extracts only the amount of gas concentration change in the sensor. Because the proposed readout circuit can adaptively regenerate the suitable reference voltage under various changing ambient conditions, it can alleviate the variation in output values at the same gas concentration caused by non-uniformities among gas sensors. Furthermore, this readout circuit effectively eliminates the initial value shifts due to the poor reproducibility of the gas sensor itself without requiring complex digital signal calibrations. This work focuses on a commercially viable readout circuit structure that can effectively obtain slow response gas information without requiring a large capacitor. The proposed readout circuit operation was verified by simulations using spectre in cadence simulation software. It was then implemented on a printed circuit board with discrete components to confirm the effectiveness with existing gas sensor systems and its commercial viability.

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The SENSIPLUS: A Single-Chip Fully Programmable Sensor Interface

Ria

Cicalini

Manfredini

et al. 2022

Lecture Notes in Electrical Engineering

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

Cited by 12 publications

References 21 publications

Flexible Multi-Channel Analog-Frontend for Ultra-Low Power Environmental Sensing

Flexible Multi-Channel Analog-Frontend for Ultra-Low Power Environmental Sensing

Chemoresistive Sensor Readout Circuit Design for Detecting Gases with Slow Response Time Characteristics

The SENSIPLUS: A Single-Chip Fully Programmable Sensor Interface

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