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Sensors 2016, 16(11), 1777; doi:10.3390/s16111777

A Low Noise CMOS Readout Based on a Polymer-Coated SAW Array for Miniature Electronic Nose

Department of Electrical Engineering, National Tsing Hua University/No. 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Ki-Hyun Kim
Received: 30 July 2016 / Revised: 18 October 2016 / Accepted: 19 October 2016 / Published: 25 October 2016
(This article belongs to the Special Issue The Use of New and/or Improved Materials for Sensing Applications)
View Full-Text   |   Download PDF [4093 KB, uploaded 25 October 2016]   |  


An electronic nose (E-Nose) is one of the applications for surface acoustic wave (SAW) sensors. In this paper, we present a low-noise complementary metal–oxide–semiconductor (CMOS) readout application-specific integrated circuit (ASIC) based on an SAW sensor array for achieving a miniature E-Nose. The center frequency of the SAW sensors was measured to be approximately 114 MHz. Because of interference between the sensors, we designed a low-noise CMOS frequency readout circuit to enable the SAW sensor to obtain frequency variation. The proposed circuit was fabricated in Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 μm 1P6M CMOS process technology. The total chip size was nearly 1203 × 1203 μm2. The chip was operated at a supply voltage of 1 V for a digital circuit and 1.8 V for an analog circuit. The least measurable difference between frequencies was 4 Hz. The detection limit of the system, when estimated using methanol and ethanol, was 0.1 ppm. Their linearity was in the range of 0.1 to 26,000 ppm. The power consumption levels of the analog and digital circuits were 1.742 mW and 761 μW, respectively. View Full-Text
Keywords: low noise; low power; miniature electronic nose; surface acoustic wave sensor array low noise; low power; miniature electronic nose; surface acoustic wave sensor array

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wu, C.-C.; Liu, S.-C.; Chiu, S.-W.; Tang, K.-T. A Low Noise CMOS Readout Based on a Polymer-Coated SAW Array for Miniature Electronic Nose. Sensors 2016, 16, 1777.

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