A new magnetometer using a small ring core and MOS-FETs

Author

Harada, K. ; Sunouchi, Y. ; Sakamoto, H.

Author_Institution

Dept. of Electron., Kyushu Univ., Fukuoka, Japan

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3399

Lastpage

3401

Abstract

A small magnetosensor with a very simple construction, a greatly reduced number of components, and a high sensitivity is presented. The circuit is based on the principle of the transistor core multivibrator, in which MOSFETs are used for switching. The sensitivity of the magnetometer is controlled by selecting the output resistance. The power consumption is very small because the commutation of the circuit is affected by the resonance between the saturation inductance of the core and the gate-source capacitance of the FET. The magnetometer is particularly suitable for obtaining biological information

Keywords

biomagnetism; biomedical electronics; field effect transistor circuits; magnetic cores; magnetometers; patient diagnosis; patient treatment; MESFET; biological information; dental treatment; diagnosis; gate-source capacitance; magnetometer; magnetosensor; output resistance; power consumption; saturation inductance; sensitivity; small ring core; switching; transistor core multivibrator; Energy consumption; Immune system; Inductance; MOSFETs; Magnetic cores; Magnetometers; RLC circuits; Resonance; Saturation magnetization; Switching circuits;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42314

Filename

42314