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:
Jul. 24, 2018
Filed:
May. 26, 2015
Nec Corporation, Tokyo, JP;
Naoki Oshima, Tokyo, JP;
NEC CORPORATION, Minato-ku, Tokyo, JP;
Abstract
There is provided a variable RF filter receiving an input differential radio frequency signal from a differential input terminals and allowing a radio frequency signal around a desired frequency to pass therethrough, wherein first passive mixers driven by a rectangular wave clock signal having an arbitrarily determined frequency are connected in parallel to a signal line across the differential input terminals and differential output terminals, and wherein a load of each of the first passive mixers is configured by inductors. Further, as a clock signal driving each of the first passive mixers, an odd-multiple-wave Lo signal (for example, a triple-wave Lo signal) is used, the signal having a frequency odd-multiple times (for example, three times) as high as that of the Lo signal which is the fundamental wave of the passing radio frequency signal.