The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 2008
Filed:
Jul. 15, 2005
Masaya Mizutani, Kasugai, JP;
Koju Aoki, Kasugai, JP;
Takahiro Watai, Kasugai, JP;
Koji Takekawa, Kasugai, JP;
Hiroyuki Sakima, Kasugai, JP;
Masaya Mizutani, Kasugai, JP;
Koju Aoki, Kasugai, JP;
Takahiro Watai, Kasugai, JP;
Koji Takekawa, Kasugai, JP;
Hiroyuki Sakima, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An amplifier circuit which is connected to a sensor and variably sets an amplification property and a control method thereof are disclosed, the circuit having the capability of restricting the influence of change with time and temperature change. The amplifier circuit, which receives, as an input, a detection signal from the sensor and variably sets an amplification property, comprises: (1) a first reference value retaining unitfor retaining a first reference value Kfor setting an amplification property which makes an output signal be a specified detection reference output voltage when a reference input condition KJ is detected; (2) a correction signal generation unitfor generating a correction signal HS which reduces the difference between an amplification property actual measurement value and an amplification property set value; and (3) a first amplification property correction unitfor correcting the first reference value Kbased on the correction signal HS.