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:
Dec. 07, 1999
Filed:
Aug. 04, 1997
Michihiro Komatsu, Fukushima-ken, JP;
ALPS Electric Co., Ltd., , JP;
Abstract
A digital broadcasting receiver tuner that demodulates excellently a digital signal by substantially reducing a second local oscillation signal that strays from a second frequency conversion stage to a first frequency conversion stage. The digital broadcasting receiver tuner comprises the first frequency conversion stage for frequency converting a received signal into a first intermediate frequency signal higher than the upper frequency limit the received signal, a first intermediate frequency filter for extracting the first intermediate frequency signal, the second frequency conversion stage for frequency converting the extracted first intermediate frequency signal into a second intermediate frequency signal having a predetermined band included in a frequency range extending from 0 to 30 MHz, a second intermediate frequency filter for extracting the second intermediate frequency signal, and a demodulation stage for demodulating the extracted second intermediate frequency signal, wherein the second frequency conversion stage comprises a frequency mixer of high isolation characteristics.