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. 12, 2002
Filed:
Oct. 19, 2000
Akira Kuwano, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
There is disclosed a 90-degree phase shifter so configured that an input signal is supplied through a variable gain amplifying circuit and a phase adjusting circuit to a low pass filter and also supplied through another variable gain amplifying circuit and another phase adjusting circuit to a high pass filter, so that the low pass filter and the high pass filter generate output signals, respectively, which have a 90-degree phase difference therebetween. An amplitude error and a phase error between the output signals are detected, so that the variable gain amplifying circuits are gain-controlled by the detected amplitude error, and the phase shift amounts of the phase adjusting circuits are controlled by the detected phase error. Thus, the amplitude error and the phase error attributable to the variation in the device characteristics and the parasite component can be removed, so that it is possible to obtain the output signals having the 90-degree phase difference with no amplitude error and no phase error.