Digital tuner

Details Digital tuner Digital tuner

2005-08-30

2005-08-30

Phu, Phuong (Department: 2631)

Pulse or digital communications

Receivers

Angle modulation

C375S325000, C375S326000, C375S327000, C375S346000, C375S316000, C455S315000, C348S725000

Reexamination Certificate

active

06937670

ABSTRACT:
A digital tuner has an input tuning range with lower and upper limit frequencies. An up converter converts an input signal to an intermediate frequency signal whose frequency is higher than the upper frequency limit of the input range. A downconverter is a zero intermediate frequency quadrature converter which converts the intermediate frequency signal to in-phase and quadrature baseband signals. The upconverter has a local oscillator fundamental frequency which is greater than the upper frequency limit of the input tuning range.

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patent: 5852477 (1998-12-01), Limberg
patent: 5933770 (1999-08-01), Heiter
patent: 5999572 (1999-12-01), Komatsu
patent: 6057876 (2000-05-01), Waight
patent: 6680977 (2004-01-01), Collins et al.
patent: 6714263 (2004-03-01), Cowley
patent: 0431397 (1991-06-01), None
patent: 2091508 (1982-07-01), None
patent: 2192104 (1987-12-01), None
patent: 2316249 (1998-02-01), None
patent: WO 98/35544 (1998-08-01), None
patent: 98/38799 (1998-09-01), None

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