Design of a CMOS Digitized Gas Transducer With Noise Shaping for CO2 Concentration Monitoring Applications

This paper proposes a complementary metal-oxide- semiconductor (CMOS) digitized gas transducer with noise shaping for CO 2 concentration monitoring applications. The proposed chip is attractive, because, when combined with various CO 2 sensors, it can monitor the present CO 2 concentration and then...

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Bibliographic Details
Published in:IEEE sensors journal 2016-02, Vol.16 (4), p.975-982
Main Authors: Chiang, Cheng-Ta, Hsieh, Chang-Chih
Format: Article
Language:English
Subjects:
CMOS integrated circuits
CO2 sensor
Digitization
Electronics packaging
Gas detectors
gas transducer
Monitoring
Noise
Semiconductor device measurement
Transducers
wireless sensor network
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Summary:This paper proposes a complementary metal-oxide- semiconductor (CMOS) digitized gas transducer with noise shaping for CO 2 concentration monitoring applications. The proposed chip is attractive, because, when combined with various CO 2 sensors, it can monitor the present CO 2 concentration and then quickly communicate with controllers or computers. The output format of the proposed chip is a type of pulse stream. It can easily be sent over a wide range of transmission media, such as package switch networks, radio, optical, infrared, and ultrasonic. Unlike previous works, the proposed chip is suitable for processing at a wide range of CO 2 concentrations, and enables noise shaping of intrinsic sensor noise for CO 2 concentration monitoring applications. On the basis of device parameters of 0.35-μm 2P4M CMOS technology with a 3 V power supply, the functions and performance of the proposed digitized gas transducer were successfully tested, measured, and confirmed to be applicable to office meeting rooms. The measured range of CO 2 concentration was 382-989 ppm, and its corresponding measured signal-to-noise-distortion ratio was 83.3-65.1 dB. The chip area is 1.18 mm × 2.48 mm. The proposed chip is suitable for CO 2 concentration monitoring devices, such as wireless sensor network devices.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2015.2492604