Magnetic field detection circuit using magnetic impedance...

Details Magnetic field detection circuit using magnetic impedance... Magnetic field detection circuit using magnetic impedance...

2005-05-24

2005-05-24

Le, N. (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S260000, C324S244000

Reexamination Certificate

active

06897649

ABSTRACT:
A magnetic field detection circuit comprises a magnetic impedance device, a detection coil wound around or arranged close to the impedance device, an electric current application circuit for applying a pulse-shaped high frequency electric current substantially equally swinging to the positive side and the negative side to the magnetic impedance device, and a detection circuit for detecting a voltage generated in the detection coil in response to rises and falls of the applied pulse-shaped electric current and outputting a signal corresponding to the intensity of the external magnetic field on the basis of the outcome of the detection. The magnetic field detection circuit can provide nil-point setting on a stable basis by means of a simple circuit arrangement at low cost.

REFERENCES:
patent: 6229307 (2001-05-01), Umehara et al.
patent: 6456068 (2002-09-01), Kawase
patent: 20020047701 (2002-04-01), Kawase

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