Signal detection technique utilising 'lock-in' architecture using 2 omega(c) harmonic frequency for portable sensors
- Authors
- Son, H. -H.; Jung, I. -I.; Hong, N. -P.; Kim, D. -G.; Choi, Y. -W.
- Issue Date
- Jun-2010
- Publisher
- INST ENGINEERING TECHNOLOGY-IET
- Citation
- ELECTRONICS LETTERS, v.46, no.13, pp 891 - U36
- Journal Title
- ELECTRONICS LETTERS
- Volume
- 46
- Number
- 13
- Start Page
- 891
- End Page
- U36
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/22375
- DOI
- 10.1049/el.2010.0684
- ISSN
- 0013-5194
1350-911X
- Abstract
- A signal detection technique utilising a 'lock-in' architecture using the second-order harmonic frequency (2 omega(c)) applicable to portable optical-biosensor systems is presented. The properties of frequency synthesis and filtering techniques are used to detect a weak signal concealed in intense background noise, such as thermal noise, 1/f noise and shot noise. Using the 2 omega(c) lock-in, the main signal of interest keeps away from the influence of the 1/f noise, providing a much higher dynamic reserve. In this work, a portable biosensor system using the 2 omega(c) frequency detection technique is demonstrated. The technique further enhances the minimum detectable range of 20 dB compared to the conventional DC lock-in method under the same conditions.
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Collections - College of ICT Engineering > School of Electrical and Electronics Engineering > 1. Journal Articles
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