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Sensors 2013, 13(1), 86-105; doi:10.3390/s130100086
Article

A Protein Concentration Measurement System Using a Flexural Plate-Wave Frequency-Shift Readout Technique

1
, 1
, 2
, 1
, 1
, 1
 and 1,*
1 Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan 2 Industrial Technology Research Institute (ITRI), Tainan 70955, Taiwan
* Author to whom correspondence should be addressed.
Received: 10 October 2012 / Revised: 29 November 2012 / Accepted: 5 December 2012 / Published: 21 December 2012
(This article belongs to the Section Biosensors)

Abstract

A protein concentration measurement system with two-port flexural plate-wave (FPW) biosensors using a frequency-shift readout technique is presented in this paper. The proposed frequency-shift readout method employs a peak detecting scheme to measure the amount of resonant frequency shift. The proposed system is composed of a linear frequency generator, a pair of peak detectors, two registers, and a subtractor. The frequency sweep range of the linear frequency generator is limited to 2 MHz to 10 MHz according to the characteristics of the FPW biosensors. The proposed frequency-shift readout circuit is carried out on silicon using a standard 0.18 μm CMOS technology. The sensitivity of the peak detectors is measured to be 10 mV. The power consumption of the proposed protein concentration measurement system is 48 mW given a 0.1 MHz system clock.
Keywords: FPW; frequency-shift readout circuit; peak detection; resonant frequency; immunoglobulin E FPW; frequency-shift readout circuit; peak detection; resonant frequency; immunoglobulin E
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.

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Wang, C.-C.; Sung, T.-C.; Hsu, C.-H.; Tsai, Y.-D.; Chen, Y.-C.; Lee, M.-C.; Huang, I.-Y. A Protein Concentration Measurement System Using a Flexural Plate-Wave Frequency-Shift Readout Technique. Sensors 2013, 13, 86-105.

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