Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-04-04
2006-04-04
Bui, Bing Q. (Department: 2642)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S313000, C455S323000
Reexamination Certificate
active
07024172
ABSTRACT:
A direct conversion quadrature receiver and method are provided according to the invention. The receiver according to one embodiment includes a primary local oscillator (LO) that down-converts a received RF signal to a quadrature intermediate frequency (IF) signal. The receiver further includes a dithering controller responsive to the quadrature IF signal generated by the primary LO. The dithering controller communicates a feedback signal back to the primary LO. The feedback signal controls the primary LO in order to offset down-conversion of the RF signal by the quadrature IF signal. The dithering controller offsets the primary LO from a zero-IF signal in order to reduce a phase and gain error of the quadrature IF signal.
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patent: 5230099 (1993-07-01), Loper
patent: 5604929 (1997-02-01), Loper et al.
patent: 6061574 (2000-05-01), Goldberg
patent: 6088573 (2000-07-01), Tsuda
patent: 6775528 (2004-08-01), Bedgedjian
Chavez Carlos J.
Frank Gunther B.
Hoffman Dennis
Murphy Patrick J.
Al-Aubaidi Rasha S.
Bui Bing Q.
Eppele Kyle
Jensen Nathan O.
Rockwell Collins, inc.
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