Title:
HALL ELECTROMOTIVE FORCE SIGNAL DETECTION CIRCUIT AND CURRENT SENSOR THEREOF
Document Type and Number:
WIPO Patent Application WO/2013/111521
Kind Code:
A1
Abstract:
This invention relates to a Hall electromotive force signal detection circuit and a current sensor thereof that allow for achievement of excellent broadband characteristic and high-speed response as well as high precision at the same time. A difference calculation circuit (15) samples, at timings obtained from chopper clocks generated by a chopper clock generation circuit (14), the components, which are synchronous with the chopper clocks, of output voltage signals from a signal amplification circuit (13) for detection. An integration circuit (16) integrates, in the time domain, outputs of the difference calculation circuit (15). An output voltage signal of the integration circuit (16) is fed back to the signal amplification circuit (13) via a third transconductance element (17).
Inventors:
OKATAKE SHIGEKI (JP)
NAKAMURA TAKENOBU (JP)
NAKAMURA TAKENOBU (JP)
Application Number:
PCT/JP2013/000065
Publication Date:
August 01, 2013
Filing Date:
January 10, 2013
Export Citation:
Assignee:
ASAHI KASEI MICRODEVICES CORP (JP)
International Classes:
G01R33/07; G01R15/20; H01L43/06
Foreign References:
| JP2008513762A | 2008-05-01 | |||
| JP2010507095A | 2010-03-04 | |||
| JP2011163928A | 2011-08-25 | |||
| JP2008309626A | 2008-12-25 | |||
| JP2011163928A | 2011-08-25 | |||
| JP2011169811A | 2011-09-01 | |||
| JP2010507095A | 2010-03-04 | |||
| US7764118B2 | 2010-07-27 | |||
| US6674322B2 | 2004-01-06 | |||
| JP2007525680A | 2007-09-06 | |||
| JP2004069466A | 2004-03-04 |
Other References:
R S POPOVIC: "Hall Effect Devices", May 1991, INST OF PHYSICS PUB INC, pages: 829 - 836
BILOTTI ET AL.: "Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 32, no. 6, 1997, XP000723405, DOI: doi:10.1109/4.585275
BURT; ZHANG: "A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time Signal Path", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 41, no. 12, 2006, pages 2729 - 2736, XP011150717, DOI: doi:10.1109/JSSC.2006.884195
WU ET AL.: "A Chopper Current-Feedback Instrumentation Amplifier With a lmHz 1/f Noise Corner and an AC-Coupled Ripple Reduction Loop", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 44, no. 12, 2009, pages 3232 - 3243
MOTZ ET AL.: "A Chopped Hall Sensor With Small Jitter and Programmable ''True Power-On'' Function", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 40, no. 7, 2005, pages 1533 - 1540, XP011135461, DOI: doi:10.1109/JSSC.2005.847488
See also references of EP 2728369A4
BILOTTI ET AL.: "Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 32, no. 6, 1997, XP000723405, DOI: doi:10.1109/4.585275
BURT; ZHANG: "A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time Signal Path", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 41, no. 12, 2006, pages 2729 - 2736, XP011150717, DOI: doi:10.1109/JSSC.2006.884195
WU ET AL.: "A Chopper Current-Feedback Instrumentation Amplifier With a lmHz 1/f Noise Corner and an AC-Coupled Ripple Reduction Loop", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 44, no. 12, 2009, pages 3232 - 3243
MOTZ ET AL.: "A Chopped Hall Sensor With Small Jitter and Programmable ''True Power-On'' Function", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 40, no. 7, 2005, pages 1533 - 1540, XP011135461, DOI: doi:10.1109/JSSC.2005.847488
See also references of EP 2728369A4
Attorney, Agent or Firm:
MORI, Tetsuya et al. (JP)
Woods Tetsuya (JP)
Woods Tetsuya (JP)
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Claims: