Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Using a particular bridge circuit
Reexamination Certificate
2006-10-24
2006-10-24
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Using a particular bridge circuit
C324S706000, C324S526000
Reexamination Certificate
active
07126355
ABSTRACT:
A physical quantity sensing device includes an AC voltage generator for generating an AC voltage and a bridge circuit that has first and second input points, to which the AC voltage is applied, and first and second output points connected to a differential amplifier. The bridge circuit includes first and second sensor elements, the impedance of which change with a physical quantity to be measured. The first and second sensor elements have a positive temperature characteristic in which sensitivity increases as temperature rises. The AC voltage generator includes an amplitude limiter which has a negative temperature characteristic that decreases the amplitude of the AC voltage with a rise in temperature, thereby compensating for temperature dependence of a differential voltage produced between the first and second output points.
REFERENCES:
patent: 3763955 (1973-10-01), Schroder et al.
patent: 3913392 (1975-10-01), Nagase et al.
patent: 4300395 (1981-11-01), Shirouzu et al.
patent: 5307690 (1994-05-01), Hanazawa
patent: 5345184 (1994-09-01), Andoh
patent: 5656938 (1997-08-01), Bennohr et al.
patent: 6329825 (2001-12-01), Tanaka et al.
patent: 6559661 (2003-05-01), Muchow et al.
patent: 6724202 (2004-04-01), Tanizawa
patent: 2002/0047460 (2002-04-01), Yoneda et al.
patent: 2002/0154030 (2002-10-01), Diehl
patent: 05-060627 (1993-03-01), None
patent: 05-45537 (1993-06-01), None
patent: 07-002943 (1995-01-01), None
patent: 08-035891 (1996-02-01), None
patent: 10-261128 (1998-09-01), None
patent: 2001-050828 (2001-02-01), None
patent: 2001-356059 (2001-12-01), None
patent: 2003-227765 (2003-08-01), None
Kenji Seto, “Physical Quantity Sensing Device with Bridge Circuit and Zero Point Adjusting Method,” U.S. Appl. No. 11/130,954, filed on May 17, 2005.
Keating & Bennett LLP
Nguyen Vincent Q.
Yamaha Hatsudoki Kabushiki Kaisha
Zhu John
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