| 摘要 |
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.
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