Title :
Incremental delta-sigma A/D converter for ion-sensitive system application
Author :
Lee, Po-Chiao ; Chung, Wen-Yaw ; Te, Mark Anthony
Author_Institution :
Dept. of Electron. Eng., Chung Yuan Christian Univ., Chungli, Taiwan
Abstract :
This paper describes a 13-bit high-resolution incremental delta-sigma A/D converter suitable for multi ion-selective sensor array system, also known as electronic tongue system. The incremental delta sigma structure is very suitable for sensor measurement application, since it achieves high accuracy using only simple circuitry. The chip is designed using TSMC 0.35um 3.3V technology having an input range of 1.15V to 2.15V. The chip achieved an excellent linearity performance of -0.17mLSB DNL and range of -0.37LSB to 0.15 LSB INL. The total chip area occupies only 0.09mm2 and a power dissipation of 791uW for the analog front-end.
Keywords :
analogue-digital conversion; delta-sigma modulation; electronic tongues; ion sensitive field effect transistors; sensor arrays; ISFET; TSMC technology; delta-sigma modulator; electronic tongue system; incremental delta-sigma A/D converter; ion sensitive field effect transistor; multiion-selective sensor array system; power 791 muW; sensor measurement application; size 0.35 mum; voltage 1.15 V to 2.15 V; voltage 3.3 V; word length 13 bit; Bandwidth; CMOS integrated circuits; CMOS technology; Linearity; Monitoring; Switches; Delta-sigma (ΔΣ) modulator; electronic tongue; incremental analog-to-digital (A/D) converter; ion-sensitive sensor;
Conference_Titel :
Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-7454-7
DOI :
10.1109/APCCAS.2010.5774833
