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:
Jun. 19, 1990
Filed:
Sep. 19, 1988
Masaaki Kawai, Kawasaki, JP;
Hisako Watanabe, Machida, JP;
Tomoyuki Ohtsuka, Kawasaki, JP;
Haruo Yamashita, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A phase shift circuit used in a regenerating repeater, includes a separating unit for separating an input signal into two separate signals having a phase difference of a phase angle of 90.degree. therebetween, one separated signal having a '0' phase and the other separated signal having a '.pi./2' phase. A distributing unit distributes the '0' phase separated signal and '.pi./2' phase separated signal as three distributed signals having phase difference of phase angles of 90.degree. and 180.degree. therebetween, one distributed signal having a '0' phase and the others being a '.pi./2' phase distributed signal and a '.pi.' phase distributed signal. A weighting/compounding unit analyzes the '0' phase distributed signal, '.pi./2' phase distributed signal, and '.pi.' phase distributed signal regarding a plurality of phase signals each having a phase shift extent, compounds each of the phase signals after being weighted by each amplitude, the weighting being performed by a weight control signal applied from an external stage, and generates an output signal adding a phase shift proportional to the weight to the input signal.