High-Sensitivity Charge-Transfer-Type pH Sensor With Quasi-Signal Removal Structure

Author

Nakazawa, H. ; Otake, R. ; Futagawa, Masato ; Dasai, Fumihiro ; Ishida, Makoto ; Sawada, Kazuaki

Author_Institution

Integrated Circuit & Sensor Syst. Group, Toyohashi Univ. of Technol., Toyohashi, Japan

Volume

61

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

136

Lastpage

140

Abstract

Charge-transfer-type pH sensors can be used to improve pH sensitivity with enhanced signal-to-noise ratio by applying the charge-accumulation technique. Theoretically, the pH sensitivity improves directly with the accumulated count. However, in a conventional sensor structure, a quasi-signal resulting from low charge transfer efficiency limits the accumulated count. In this paper, an effective solution to the problem of the quasi-signal and the novel sensor structure are investigated.

Keywords

chemical sensors; ion sensitive field effect transistors; pH measurement; ISFET; charge transfer efficiency; charge-accumulation technique; enhanced signal-noise ratio; high-sensitivity charge-transfer-type pH sensor; pH sensitivity; quasisignal removal structure; Actuators; Educational institutions; Electric potential; Electrodes; Sensitivity; Sensors; pH measurement; Biosensors; CMOS integrated circuit; chemical sensors; sensor arrays;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2013.2292563

Filename

6680697