An ultrasensitive CMOS magnetic biosensor array with correlated double counting noise suppression
Abstract
This paper presents a scalable and ultrasensitive frequency-shift magnetic biosensing array scheme. The theoretical limit of the sensor noise floor is shown to be dominated by the phase noise of the sensing oscillators. To increase the sensitivity, a noise suppression technique, Correlated Double Counting (CDC), is proposed with no power overhead. As an implementation example, a 64-cell sensor array is designed in a standard 65nm CMOS process. The CDC scheme achieves an additional 6dB noise suppression. The magnetic sensing capability of the presented sensor is verified by detecting micron size magnetic particles with an SNR of 14.6dB for a single bead and an effective dynamic range of at least 74.5dB.
Additional Information
© 2010 IEEE. Issue Date: 23-28 May 2010. Date of Current Version: 23 July 2010. The authors would like to thank C-H Lin and Z. Li of the California Institute of Technology for their technical support on SEM imaging.Attached Files
Published - Wang2010p134182008_Ieee_Mtt-S_International_Microwave_Symposium_Digest_Vols_1-4.pdf
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Additional details
- Eprint ID
- 23312
- Resolver ID
- CaltechAUTHORS:20110413-133914587
- Created
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2011-05-17Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
- Series Name
- IEEE MTT-S International Microwave Symposium