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Title:
MAGNETIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2018/159776
Kind Code:
A1
Abstract:
Provided is a magnetic sensor which makes it possible to improve the frequency characteristics of output voltage. The magnetic sensor is provided with: a magnetic detection unit including first through fourth magnetoresistive effect elements (10, 20, 30, 40) to which a first magnetic field to be detected is applied; a first operational amplifier 50 to which an output voltage of the magnetic detection unit is inputted; a magnetic field-generating conductor 70 for generating a second magnetic field canceling out the first magnetic field in the magnetic detection unit by a flow of negative feedback current outputted by the first operational amplifier 50; a detection resistor Rs to which the negative feedback current flows; and a second operational amplifier 60. The second operational amplifier 60 includes: an inverting input terminal connected to one magnetic field-generating conductor 70-side end of the detection resistor Rs; an output terminal connected to another end of the detection resistor Rs; and a non-inverting input terminal connected to ground serving as a fixed-voltage terminal.

Inventors:
TANABE KEI (JP)
KASAJIMA TAMON (JP)
UNNO AKIHIRO (JP)
TAKAHASHI MASASHI (JP)
Application Number:
PCT/JP2018/007876
Publication Date:
September 07, 2018
Filing Date:
March 01, 2018
Export Citation:
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Assignee:
TDK CORP (JP)
International Classes:
G01R15/20; G01R33/09; H01L43/08
Domestic Patent References:
WO2014006914A12014-01-09
Foreign References:
JP2010085228A2010-04-15
JP2013238580A2013-11-28
Attorney, Agent or Firm:
MURAI, Takashi et al. (JP)
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