Title:
METHOD FOR SUPPRESSING PHASE NOISE OF HIGH FREQUENCY CARRIER TYPE MAGNETIC FIELD SENSOR AND APPARATUS THEREFOR
Document Type and Number:
Japanese Patent JP3822058
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for suppressing a phase noise of a high frequency carrier type magnetic field sensor and an apparatus therefor which enable detecting minute signals to a level of thermal fluctuation of a sensor element itself or thermal noise by reducing an SSB phase noise.
SOLUTION: There are provided a signal generator 1, a first divider 2 connected to the signal generator 1, the sensor element 3 connected to the first divider 2, a series connection circuit which is connected in parallel to the sensor element 3 and is comprised of an attenuator 4 connected to the first divider 2 and a phase shifter 5, a second divider 6 connected to the sensor element 3 and the phase shifter 5, a preamplifier 7 connected to the second divider 6, and a spectrum analyzer 8 connected to the preamplifier 7. A carrier voltage is divided by the first divider 2 and adjusted with the use of the attenuator 4 and the phase shifter 5 so that an output signal of the phase shifter 5 becomes equal in amplitude and different by approximately 180° in phase to a carrier component as an output signal of the sensor element 3.
Inventors:
Kenichi Arai
Masahiro Yamaguchi
Yabugami Makoto
Tetsu Suzuki
Masahiro Yamaguchi
Yabugami Makoto
Tetsu Suzuki
Application Number:
JP2001003446A
Publication Date:
September 13, 2006
Filing Date:
January 11, 2001
Export Citation:
Assignee:
Japan Science and Technology Agency
International Classes:
G01R33/02; H01L43/00; (IPC1-7): G01R33/02; H01L43/00
Domestic Patent References:
| JP1090380A | ||||
| JP58139082A | ||||
| JP56116685U | ||||
| JP832351A |
Attorney, Agent or Firm:
Mamoru Shimizu