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. 13, 2002
Filed:
Aug. 30, 2000
Applicant:
Inventor:
Hiroshi Isoda, Nara, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D 7/14 ;
U.S. Cl.
CPC ...
H03D 7/14 ;
Abstract
In a demodulator, a local oscillator feeds a local oscillation signal having a frequency of f/n to a phase shifter . In the phase shifter , all-pass filters and produce two oscillation signals separated in phase by 90/n degrees from each other, which are then fed individually to n-times frequency multiplier and . The n-times frequency multipliers and multiply the frequency of those oscillation signals by a factor of n and thereby produce two carriers having a frequency of f and separated in phase by 90 degrees from each other, which are then fed to mixers and