Title :
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
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;
Conference_Titel :
SENSORS, 2014 IEEE
Conference_Location :
Valencia
DOI :
10.1109/ICSENS.2014.6984970
