A cost-effective angle demodulator IC for path matched differential interferometry based sensors

Author

Hao-Chiao Hong ; Yun-Tse Chen ; Shao-Feng Hung ; Chin-Cheng Wu ; Yi Chiu

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

fYear

2014

fDate

2-5 Nov. 2014

Firstpage

209

Lastpage

212

Abstract

The angle demodulator (ADM) is a key component for the path matched differential interferometry (PMDI) sensors. Conventional ADMs require tens of operational amplifiers (OPAMPs) and bulky capacitors and resistors, making them difficult to be realized as integrated circuits (ICs). This paper presents the first ADM IC design that requires only one OPAMP and thus saves significant area and power. In addition, this novel ADM design tolerates a wide range of modulation depth of the optical interferometer of the PMDI sensors. As a result, the yield of the PMDI sensor significantly increases. A test chip has been designed and successfully verified in 0.18-μm CMOS. The active area of the proposed circuits is only 476 by 368 μm² and it consumes only 6.26 mW.

Keywords

CMOS integrated circuits; capacitors; demodulators; fibre optic sensors; integrated circuit design; light interferometry; operational amplifiers; resistors; ADM IC design; CMOS integrated sensor; OPAMP; PMDI sensors; angle demodulator IC; bulky capacitors; operational amplifiers; optical interferometer; path matched differential interferometry based sensors; power 6.26 mW; resistors; size 0.18 mum; Art; Integrated optics; Mirrors; Optical fiber sensors; Optical fibers;

fLanguage

English

Publisher

ieee

Conference_Titel

SENSORS, 2014 IEEE

Conference_Location

Valencia

Type

conf

DOI

10.1109/ICSENS.2014.6984970

Filename

6984970