Circular MAGFET Design and SNR Optimization for Magnetic Bead Detection

A novel circular CMOS MAGFET (Magnetic Field Effect Transistor) design is introduced and a novel device geometry design methodology is proposed to optimize the magnetic particle detection sensitivity of such devices. In order to optimize the signal to noise ratio, it was determined that the geometry...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2012-11, Vol.48 (11), p.3851-3854
Main Authors: Zhang, Bowei, Korman, Can E., Zaghloul, Mona E.
Format: Article
Language:English
Subjects:
Circular MAGFET
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Geometry
MAGFET
Magnetic circuits
Magnetic sensors
Magnetism
Materials science
Other topics in materials science
Performance evaluation
Physics
Signal to noise ratio
signal-to-noise ratio (SNR)
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Description
Summary:A novel circular CMOS MAGFET (Magnetic Field Effect Transistor) design is introduced and a novel device geometry design methodology is proposed to optimize the magnetic particle detection sensitivity of such devices. In order to optimize the signal to noise ratio, it was determined that the geometry of the MAGFET is required to have specific ratios, where its sector angle θ and its inner and outer radii r 1 and r 2 are optimized when θ/ ln ( r 2 / r 1 ) = 1.3 . Compared to the more traditional rectangular MAGFET, the circular MAGFET has compatible SNR peak performance with rectangular MAGET. However, when the size of the MAGFET is scaled down in order to detect smaller magnetic particles, the proposed circular MAGFET has more robust SNR performance, design flexibility and tolerance to processing variations.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2012.2201139