Title:
SEMICONDUCTOR INTEGRATED CIRCUIT, MAGNETISM DETECTION DEVICE, ELECTRONIC COMPASS, AND AMMETER
Document Type and Number:
WIPO Patent Application WO/2012/043738
Kind Code:
A1
Abstract:
This semiconductor integrated circuit has: a clock-generation circuit (M21); a signal-processing circuit (M23) that, on the basis of a clock signal outputted by the clock-generation circuit (M21), outputs a strength signal corresponding to the strength of an external magnetic field, said strength signal being based on the time interval between a first spike-shaped voltage waveform and a second spike-shaped voltage waveform that is the next waveform detected after the first spike-shaped voltage waveform and has a sign opposite to that of the first spike-shaped voltage waveform; and a clock control circuit (M22) that performs control so as to stop the output of the strength signal from the signal-processing circuit during, at least, preceding stop periods which are before the peaks of a triangle wave and last for 1-5% of the period thereof and following stop periods which are after the peaks of the triangle wave and last for 1-5% of the period thereof.
Inventors:
ITOI KAZUHISA (JP)
Application Number:
PCT/JP2011/072419
Publication Date:
April 05, 2012
Filing Date:
September 29, 2011
Export Citation:
Assignee:
FUJIKURA LTD (JP)
ITOI KAZUHISA (JP)
ITOI KAZUHISA (JP)
International Classes:
G01R33/04; G01C17/30
Foreign References:
| JP2008292325A | 2008-12-04 | |||
| JPH08285929A | 1996-11-01 | |||
| JP2005147947A | 2005-06-09 | |||
| JPH09152473A | 1997-06-10 |
Other References:
G. TRENKLER: "Die Messung schwacher magnetischer Felder mittels Magnetometer mit direkter Zeitverschlusselung", MESSTECHNIK, 1970, pages 205, XP002147116
See also references of EP 2624003A4
See also references of EP 2624003A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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Claims: