Dynamic power sharing zero intermediate frequency (ZIF)...

Details Dynamic power sharing zero intermediate frequency (ZIF)... Dynamic power sharing zero intermediate frequency (ZIF)...

2006-08-01

2006-08-01

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S313000, C455S314000, C455S319000, C455S216000, C327S355000, C327S116000

Reexamination Certificate

active

07085549

ABSTRACT:
A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer (200) includes a low noise amplifier (LNA) (203), a first RF mixer stage (205) for mixing an RF signal from the at least one LNA with a first local oscillator signal operating a first predetermined frequency. A second RF mixer stage (207) is then utilized for mixing in-phase (I) and quadrature (Q) digital signals from the first RF mixer stage (205) with a plurality of second local oscillator signals (LO) operating at a second predetermined frequency. The invention significantly improves current drain by eliminating the need for a linear transconductance stage while still maintaining high degrees of isolation and linearity.

REFERENCES:
patent: 6282413 (2001-08-01), Baltus
patent: 6510185 (2003-01-01), Lee et al.
patent: 6876844 (2005-04-01), Wong
patent: 2003/0222702 (2003-12-01), Bjork et al.

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