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Title:
DRIVE CIRCUIT AND PHYSICAL QUANTITY SENSOR APPARATUS
Document Type and Number:
WIPO Patent Application WO/2010/084531
Kind Code:
A1
Abstract:
Disclosed is an amplitude detection circuit (101) that detects the amplitude value (D101) of a monitor signal (Smnt) in response to self-excited oscillation of a physical quantity sensor (10). A wave shaping circuit (102) converts the monitor signal to a pulsed signal. A pulse amplitude modulation circuit (104) adjusts the amplitude of the pulsed signal in accordance with the amplitude value (D101), and outputs this amplitude as a drive signal (Sdrv) for control of self-excited oscillation of the physical quantity sensor.

Inventors:
KAINO YOICHI
TANIGUCHI MOTONORI
INUKAI FUMIHITO
Application Number:
PCT/JP2009/002688
Publication Date:
July 29, 2010
Filing Date:
June 12, 2009
Export Citation:
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Assignee:
PANASONIC CORP (JP)
KAINO YOICHI
TANIGUCHI MOTONORI
INUKAI FUMIHITO
International Classes:
G01C19/56; G01C19/5614
Foreign References:
JP2005524077A2005-08-11
JP2008128860A2008-06-05
JP2000009475A2000-01-14
JP2003234638A2003-08-22
JPS63285412A1988-11-22
Attorney, Agent or Firm:
MAEDA, Hiroshi et al. (JP)
Hiroshi Maeda (JP)
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