A new small-sized non-dispersive infrared (NDIR) sensor and its drive/readout circuits

Chang-Po Chao*, Li Chi Hsu, Trong Hieu Tran

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new miniaturized, non-dispersive, infrared (NDIR) sensor for CO2 intended to be installed in mobile phones and its drive/readout circuits are presented in this study. A typical NDIR sensor consists of three main components; an infrared (IR) lightemitter (light source), a gas chamber, a photo detector (PD) light receiver) and the associated drive/readout circuits. The geometry of the gas chamber is optimized to minimize the total module size to approximately 10 mm x 5 mm x 5 mm, which is much smaller than commercially-available gas sensors. Driver and readout circuits are successfully designed and taped out. The driver circuit intends to generate pulse width modulation (PWM) signal to control proper dimming of LED. The readout circuit, which acquires small signal from photo detector then converts to digital values, includes amplifier, low pass filter and analog-todigital converter (ADC). The proposed circuit is fabricated by the TSMC 0.35-μm CMOS process, where the area is 4.527 mm2 while power consumption is 60.16 mW for the whole chip. The resolution is less than 12 ppm along with time constant is 0.1 sec.

Original languageEnglish
Title of host publicationASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791849880
DOIs
StatePublished - 1 Jan 2016
EventASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016 - Santa Clara, United States
Duration: 20 Jun 201621 Jun 2016

Publication series

NameASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016

Conference

ConferenceASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
CountryUnited States
CitySanta Clara
Period20/06/1621/06/16

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  • Cite this

    Chao, C-P., Hsu, L. C., & Tran, T. H. (2016). A new small-sized non-dispersive infrared (NDIR) sensor and its drive/readout circuits. In ASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016 (ASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016). American Society of Mechanical Engineers. https://doi.org/10.1115/ISPS2016-9562