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:
Feb. 11, 1992
Filed:
Sep. 19, 1990
Hiroshi Matsunaga, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A receiving circuit includes of a differential amplifier which receives at an input stage a balanced signal transmitted from a pair of signal transmission lines and outputs a logic 'H' or 'L'. An alarm generating unit which includes positively and negatively biased first and second differential amplifiers, a logic gate unit and a pulse width detection unit. The logic gate unit is located at the input stage of the differential amplifier and displays the detection of a small differential voltage appearing at the time abnormalities are detected. The pulse width detection unit produces an alarm signal when the pulse width of the output pulse from the logic gate unit has become longer than a predetermined pulse width. By using the first and second differential amplifiers, it is possible to prevent the signal transmission lines from becoming sources of electromagnetic interference (EMI).