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:
Apr. 10, 2007
Filed:
Mar. 04, 2002
Masahiro Narita, Gifu, JP;
Yasunori Akatsuka, Gifu, JP;
Masahiro Narita, Gifu, JP;
Yasunori Akatsuka, Gifu, JP;
Sanyo Telecommunications Co., Ltd., Osaka, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An RF circuit () satisfies Pnoise+NF+G≦Plim+sW (0≦s≦4) at an edge of a guard band with respect to a required transmission level PAll, an upper tolerance level of out-of-band noise Plim, a guard bandwidth W, and a noise level Pnoise, where NF is a noise figure and G is a gain. An IF circuit () satisfies PAll≦Pin+G, where PIF is an output level of a BPF (). Out-of-band noise levels are reduced to Pnoise by the steep BPF (). The RF circuit () is structured so that noise from a local oscillator circuit () does not surpass noise from the IF circuit (). Reductions in power consumption are thus realized in addition to guard bandwidth reductions, because of being able to eliminate out-of-band noise from an amplifier () using a low-loss filter () having an attenuation slope s.