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

*此作品的通信作者

研究成果: Conference contribution同行評審

摘要

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.

原文English
主出版物標題IEEE Sensors 2011 Conference, SENSORS 2011
發行者Institute of Electrical and Electronics Engineers Inc.
頁面1141-1144
頁數4
ISBN(列印)9781424492886
DOIs
出版狀態Published - 2011
事件10th IEEE SENSORS Conference 2011, SENSORS 2011 - Limerick, Ireland
持續時間: 28 10月 201131 10月 2011

出版系列

名字Proceedings of IEEE Sensors
ISSN(列印)1930-0395
ISSN(電子)2168-9229

Conference

Conference10th IEEE SENSORS Conference 2011, SENSORS 2011
國家/地區Ireland
城市Limerick
期間28/10/1131/10/11

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