High-sensitivity photodetection sensor front-end, detecting organophosphourous compounds for food safety

Author

Lei Wan ; Yajie Qin ; Chiang, Patrick ; Guoping Chen ; Ran Liu ; Zhiliang Hong

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2013

fDate

22-25 Sept. 2013

Firstpage

1

Lastpage

4

Abstract

A high-sensitivity, high dynamic range photodetection sensor front-end is presented, suitable for low-cost hand-held food safety systems. This sensor front-end for detecting organophosphorus (OP) compounds incorporates an on-chip deep N-well photodetector, pulse width modulation (PWM), and a folded reference. Designed in a 0.18 μm process, measurement results show an input optical power dynamic range of 71 dB, a sensitivity of 3.6nW/cm² (0.77pA), and a power consumption of 14.5 μW. OP compound detection experiments demonstrate a limit of detection (LOD) of 0.16u mol/L, comparable to that of a commercial spectrophotometer.

Keywords

chemical sensors; food safety; organometallic compounds; photodetectors; pulse width modulation; signal processing equipment; spectrochemical analysis; spectrophotometry; PWM; folded reference; food safety; high sensitivity photodetection sensor; on-chip deep N-well photodetector; organophosphourous compound detection; power 14.5 muW; pulse width modulation; size 0.18 mum; Compounds; Optical attenuators; Optical fiber sensors; Optical fibers; Optical pulses; CMOS sensor; high sensitivity; low power; optical sensor; organophosphorus compounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2013 IEEE

Conference_Location

San Jose, CA

Type

conf

DOI

10.1109/CICC.2013.6658511

Filename

6658511