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. 12, 2003
Filed:
Dec. 21, 2001
Applicant:
Inventor:
Ching-Feng Lee, Hsinchu, TW;
Assignee:
Industrial Technology Research Institute, Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D 3/00 ;
U.S. Cl.
CPC ...
H03D 3/00 ;
Abstract
A FM demodulator using a single input signal has two I-Q splitters with constant group delay apparatuses. During operation, t two I-Q splitters with constant group delay apparatuses may receive the input modulated signal to generate not only one pair of modulated and respectively delay &tgr; and &tgr; in phase signals but also another pair of modulated and respective delay &tgr; and &tgr; quadrature signals. These signals are used to demodulate the final demodulated signal.