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:
Dec. 31, 2019
Filed:
Oct. 05, 2017
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Toshihiro Shimura, Yokohama, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A variable attenuation device includes: a first variable attenuator configured to receive a first signal through a first input end, attenuate the first signal by an amount of attenuation according to a control voltage, and output the attenuated first signal through a first output end, the first signal being one of a pair of differential signals having a 180-degree phase difference; a second variable attenuator configured to receive a second signal through a second input end, attenuate the second signal by the amount of attenuation according to the control voltage, and output the attenuated second signal through a second output end, the second signal being the other one of the pair of differential signals; a first signal distributer configured to distribute the second signal to the first output end; and a second signal distributer configured to distribute the first signal to the second output end.