Title:
DETECTION CIRCUIT
Document Type and Number:
Japanese Patent JP2020085574
Kind Code:
A
Abstract:
To provide a detection circuit which can be reduced in size and in cost as compared with an existing detection circuit.SOLUTION: A detection circuit 1A includes: a reception unit 13 in which GMR elements 15a and 15c are half-bridge connected; a signal generator 18b; and a low-pass filter 18a. The directions of magnetization of the pin layers of the GMR elements 15a and 15c are parallel to each other and face opposite directions. The reception unit 13 receives a magnetic field Hpropagating in a space. The signal generation unit 18b inputs, in the reception unit 13, an alternation voltage Vof the frequency for which amplitude information is to be taken out. A high-frequency component is removed from the output voltage of the reception unit 13 through the low-pass filter 18a. The output voltage Vout of the low-path filter 18a is a synchronous detected magnetic field H.SELECTED DRAWING: Figure 1
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Inventors:
TANABE KEI
UNNO AKIHIRO
UNNO AKIHIRO
Application Number:
JP2018217791A
Publication Date:
June 04, 2020
Filing Date:
November 20, 2018
Export Citation:
Assignee:
TDK CORP
International Classes:
G01R33/09; G01R33/02
Domestic Patent References:
| JP2000055998A | 2000-02-25 | |||
| JP2018146303A | 2018-09-20 | |||
| JP2015219061A | 2015-12-07 | |||
| JP2016114408A | 2016-06-23 | |||
| JP2020085573A | 2020-06-04 |
Foreign References:
| WO2015056397A1 | 2015-04-23 | |||
| WO2017073280A1 | 2017-05-04 |
Attorney, Agent or Firm:
Takashi Murai
Hiromi Murai
Hiromi Murai