Rectangular cmos differential MAGFET biosensor for magnetic particle detection

Author

Bowei Zhang ; Zhenyu Li ; Korman, Can E. ; Zaghloul, Mona E.

Author_Institution

OmniVision Technol., Santa Clara, CA, USA

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

4052

Lastpage

4055

Abstract

A novel rectangular shape differential CMOS split-drain Hall Effect magnetic field-effect transistor (MAGFET) was designed and fabricated employing a CMOS 0.5 μm process. The detection and monitoring of single 2.8 μm diameter magnetic beads was successfully performed using this MAGFET design. Based on the device modeling, simulation and the signal to noise ratio analysis, it was found that the optimal sensitivity can be achieved when the MAGFET channel width to length ratio is equal to 1.3. Further, it is shown through that when the MAGFET is scaled down, its SNR performance can sustain its peak, while being more sensitive to the geometry variations.

Keywords

CMOS integrated circuits; Hall effect devices; biosensors; field effect transistors; magnetic sensors; particle detectors; sensitivity; SNR performance; geometry variations; magnetic beads; magnetic particle detection; optimal sensitivity; rectangular CMOS differential MAGFET biosensor; signal-to-noise ratio analysis; size 0.5 mum; size 2.8 mum; split-drain Hall Effect magnetic field-effect transistor; CMOS integrated circuits; Magnetic particles; Magnetic sensors; Sensitivity; Signal to noise ratio; CMOS; SNR; magnetic beads; magnetic field-effect transistor (MAGFET);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2237893

Filename

6559261