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:
Aug. 01, 2006
Filed:
Mar. 25, 2005
Akira Haraguchi, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Akira Haraguchi, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention aims to provide a differential voltage amplifier circuit capable of preventing narrowing of an input voltage allowable range, making unnecessary the calculation of correction by an MPU or the like, reducing an influence due to a change in temperature and detecting a high-accuracy differential voltage. Upon a short circuit between input paths, an output voltage of a differential amplifier at the short circuit therebetween is held in a capacitor. Upon differential voltage amplification, a subtraction circuit section performs a process for subtraction between the output voltage held in the capacitor and a bias voltage. An output voltage is applied to a bias voltage terminal, and an output voltage obtained by multiplying the difference between input voltages by an amplification factor AV with the applied output voltage as the reference is outputted via an output terminal for a differential voltage amplifier circuit section.