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A low power interface circuit design for a CMOS based smart optical sensor

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3 Author(s)
Israel Yohannes ; Dept. of Electr. & Electron. Eng., Univ. Technol. PETRONAS, Tronoh, Malaysia ; Maher M. Assaad ; Fabrice Meriaudeau

In this paper, a CMOS interface circuit as part of an optical sensor-based microsystem for pH monitoring applications is presented. The proposed circuit is capable of processing a voltage signal produced by the light transducer and generating 8-bit digital outputs representing the color information (i.e. wavelength). A resolution of 8 different colors has been achieved as a proof of concept and can easily be extended to a higher number of colors without a major modification in the architecture. The proposed interface circuit is a mixed-signal solution that consists of analog as well as digital building blocks along with a light transducer. It can be used as a portable and non-intrusive optical sensor for biomedical and environmental sensing applications.

Published in:

Circuits and Systems (ICCAS), 2012 IEEE International Conference on

Date of Conference:

3-4 Oct. 2012