A novel readout circuit for an OTFD gas sensor with a new front-end trans-impedance amplifier

Wan Jun Lin, Chang-Po Chao*, Shir-Kuan Lin, Hsiao-Wen Zan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The study proposes a new readout circuit for an organic gas sensor. The readout circuit consists of a preamplifier, a sample and hold circuit and a differential current amplifier. A preamplifier composed of trans-impedance to convert the output current of a gas sensor into voltage. The sample and hold circuit memorizes various voltages according to distinct designed time instants in a target gas environment. At the same time it is equipped with the advantage of repeated detections by the controlling signals which determine the frequency of switch. The differential current is amplified by a differential current amplifier and is attributable to the voltages of sample and hold circuits using current mirror framework. Flowing through the resistance load, the differential current is converted into output voltage. A microprocessor control unit (MCU) acquires and stores the outputs in order to determine gas concentration database of pre-measured which are contrast. The designed circuit is accomplished by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 3.3V mixed-signal CMOS process.

Original languageEnglish
Title of host publicationIEEE Sensors 2011 Conference, SENSORS 2011
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Print)9781424492886
StatePublished - 2011
Event10th IEEE SENSORS Conference 2011, SENSORS 2011 - Limerick, Ireland
Duration: 28 Oct 201131 Oct 2011

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference10th IEEE SENSORS Conference 2011, SENSORS 2011


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