A CMOS Gas Sensor Array Platform With Fourier Transform Based Impedance Spectroscopy

Murali, Pramod; Ranjit, K; Bhat, Navakanta; Banerjee, Gaurab; Amrutur, Bharadwaj; Bhat, K. N.; Ramamurthy, Praveen C.

doi:10.1109/tcsi.2012.2189062

Cited by 23 publications

(6 citation statements)

References 28 publications

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“…The specifications of the implemented chip and a comparison with the state-of-the art designs for similar purposes are summarized in Table 1 [ 27 – 29 ]. Compared with the referenced works, the proposed design demonstrated relatively low-power, room-temperature operation, and high versatility by printing different materials onto the sensing electrodes.…”

Section: Resultsmentioning

confidence: 99%

A Low-Power Integrated Humidity CMOS Sensor by Printing-on-Chip Technology

Lee

Chuang

Cowan

et al. 2014

Sensors

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A low-power, wide-dynamic-range integrated humidity sensing chip is implemented using a printable polymer sensing material with an on-chip pulse-width-modulation interface circuit. By using the inkjet printing technique, poly(3,4-ethylene-dioxythiophene)/polystyrene sulfonate that has humidity sensing features can be printed onto the top metal layer of a 0.35 μm CMOS IC. The developed printing-on-chip humidity sensor achieves a heterogeneous three dimensional sensor system-on-chip architecture. The humidity sensing of the implemented printing-on-chip sensor system is experimentally tested. The sensor shows a sensitivity of 0.98% to humidity in the atmosphere. The maximum dynamic range of the readout circuit is 9.8 MΩ, which can be further tuned by the frequency of input signal to fit the requirement of the resistance of printed sensor. The power consumption keeps only 154 μW. This printing-on-chip sensor provides a practical solution to fulfill an ultra-small integrated sensor for the applications in miniaturized sensing systems.

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Section: Resultsmentioning

confidence: 99%

A Low-Power Integrated Humidity CMOS Sensor by Printing-on-Chip Technology

Lee

Chuang

Cowan

et al. 2014

Sensors

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“…Usually these gas sensors have a large variation in resistance when detecting gases, sometimes by several orders of magnitude [4][5][6][7][8]. Therefore, an interface circuit with a fast response time needs to be designed, and it needs to be able to measure a relatively large range of resistance variations [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Fast Interface Circuit for the Measurement of 10 Ω to 1 GΩ Resistance

Ning,

Guo,

Jia

et al. 2023

Electronics

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In this work, an interface circuit applied to resistive gas or chemical sensors is proposed. The interface circuit includes a detection front-end, a single-end to differential circuit, a successive approximation analog-to-digital converter (SAR ADC), and some reference auxiliary circuits. In detection front-end circuits, mirrored currents in a current mirror usually differ by several orders of magnitude. In order to ensure that the current mirror can be copied accurately, this work uses a negative feedback structure consisting of an operational amplifier and an NMOS tube to ensure that the VDS of the current mirroring tube remains consistent. Simulation results show that the replication error of the current mirror is 0.015%. The proposed interface circuit has a detection range of 10 Ω to 1 GΩ with a relative error of 0.55%. The current multiplication or divided technique allows the interface circuit to have a high sampling frequency of up to 10 kHz. The proposed circuit is based on a 180 nm CMOS process with a chip area of 0.308 mm2 (723 μm ∗ 426 μm). The power consumption of the whole interface circuit is 3.66 mW when the power supply voltage is 1.8 V.

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“…Typically, traditional gas sensors simply produce the analog signals based on its resistive characteristic. Basically, to communicate with digital systems, some methods [1]- [16] have been presented. Resistive-to-time period converter (RTP) or resistive-to-frequency converter (RTF) [2]- [10] are proposed to perform their conversion.…”

Section: Introductionmentioning

confidence: 99%

“…Resistive-to-time period converter (RTP) or resistive-to-frequency converter (RTF) [2]- [10] are proposed to perform their conversion. Besides, [11]- [16] are to add an analog to digital converter (ADC). Till now, gas issues related to environmental monitors, who need to process higher environmental dynamic range, quickly response to controllers or computers, and insensitivity to noise, have not been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

A CMOS digitized gas transducer with noise insensitivity for environmental monitoring of CO<inf>2</inf> concentration

Chiang

Hsieh

2015

2015 IEEE 12th International Conference on Networking, Sensing and Control

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In this paper, a CMOS digitized gas transducer with noise insensitivity for environmental monitoring of CO 2 concentration is newly proposed. Based upon the device parameters of 0.35 μm 2P4M CMOS technology with 3.0 V power supply, all the functions and performance of the proposed digitized gas transducer are successfully tested and proven through MATLAB in the behavior simulations and SPICE simulations. The chip area is 1.18 × 2.48 mm 2 . The proposed general-purpose chip is suitable for various gas environmental monitoring devices, such as CO 2 concentration detecting instruments.

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A CMOS Gas Sensor Array Platform With Fourier Transform Based Impedance Spectroscopy

Cited by 23 publications

References 28 publications

A Low-Power Integrated Humidity CMOS Sensor by Printing-on-Chip Technology

A Low-Power Integrated Humidity CMOS Sensor by Printing-on-Chip Technology

A Fast Interface Circuit for the Measurement of 10 Ω to 1 GΩ Resistance

A CMOS digitized gas transducer with noise insensitivity for environmental monitoring of CO<inf>2</inf> concentration

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