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:
Aug. 28, 2007
Filed:
Aug. 19, 2004
Takeshi Mitsunaka, Soraku-gun, JP;
Masayuki Miyamoto, Nara, JP;
Takeshi Mitsunaka, Soraku-gun, JP;
Masayuki Miyamoto, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A frequency converter that performs dual frequency conversion is provided. The frequency converter restricts noise occurrence and enables signal transfer with good linearity. The frequency converter performs dual conversion of a first signal (RF(+) and RF(−)) by using two signals including a second signal (LO(+) and LO(−)) and a third signal (LO(+) and LO(−)). Using a balun and an amplifying circuit that performs input/output operations in a single-ended manner, the frequency converter restricts NF degradation. By feeding optimum values of current into the first and second switching circuits and into the amplifying circuit, NF and linearity are optimized. The balun, the amplifying circuit, and the first and second switching circuits are formed on the same semiconductor substrate.