Low IF mixer with improved selectivity performance

Details Low IF mixer with improved selectivity performance Low IF mixer with improved selectivity performance

2008-09-09

2008-09-09

Urban, Edward (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S310000, C455S192200, C455S192100, C375S344000, C375S327000

Reexamination Certificate

active

11022317

ABSTRACT:
A low IF mixer and method for down-converting a signal at a desired frequency are disclosed with improved selectivity performance. The energy of sidebands on each side of the desired frequency is evaluated; and a local oscillator frequency is selected based on the evaluation of the energy. Generally, the local oscillator frequency associated with the sideband having a lower energy is selected. The desired frequency may have a frequency of RF and the sidebands have a frequency of the desired frequency plus or minus an offset frequency (RF+IF or RF−IF). The signal at the desired frequency may be multiplied by the selected local oscillator frequency to down-convert the signal.

REFERENCES:
patent: 5416422 (1995-05-01), Dildine
patent: 6707858 (2004-03-01), Davie
patent: 6785529 (2004-08-01), Ciccarelli et al.
patent: 7221917 (2007-05-01), Kroeger
patent: 2001/0006542 (2001-07-01), Ozeki et al.
patent: 2003/0072393 (2003-04-01), Gu
patent: 2005/0143038 (2005-06-01), Lafleur

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