By Topic

Signal detection technique utilising 'lock-in' architecture using 2 ωc harmonic frequency for portable sensors

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $33
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
H. -H. Son ; School of Electrical and Electronics Engineering, College of Engineering, Chung-Ang University ; I. -I. Jung ; N. -P. Hong ; D. -G. Kim
more authors

A signal detection technique utilising a `lock-in` architecture using the second-order harmonic frequency (2 ωc) 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 ωc 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 ωc 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.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 13 )