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. 28, 2009
Filed:
Oct. 29, 2004
Alberto O. Adan, Ikoma, JP;
Shinji Kamiya, Kyoto, JP;
Alberto O. Adan, Ikoma, JP;
Shinji Kamiya, Kyoto, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A frequency conversion circuit of the present invention includes: (i) a first mixer for mixing the radio frequency signal having a frequency fwith a first oscillation signal having a frequency fso that the radio frequency signal is downconverted into an intermediate frequency signal; and (ii) a second mixer for mixing the intermediate frequency signal sent from the first mixer with two local oscillation signals so that the intermediate frequency signal is downconverted into two base-band signals having different phases. The second local oscillation signals have phases of 0° and 270°, respectively. These frequencies satisfies:f(f=f/m, (m>1)k=m/(m−1).This arrangement ensures (i) a small frequency conversion circuit that can be mounted on an integrated circuit, (ii) a radio frequency receiver including the frequency conversion circuit, and (iii) a radio frequency transceiver including the radio frequency receiver.