Quadrature local oscillator generation for direct conversion...

Details Quadrature local oscillator generation for direct conversion... Quadrature local oscillator generation for direct conversion...

2011-07-19

2011-07-19

Chang, Joseph (Department: 2817)

Oscillators

Beat frequency

Plural beating

C331S022000, C331S045000

Reexamination Certificate

active

07982546

ABSTRACT:
A method of generating a quadrature local oscillator (LO) frequencies is provided. In this method, a voltage-controlled oscillator (VCO) frequency can be mixed with a divided version of the VCO frequency to generate mixed signals. A lower sideband of the mixed signals can be selected for the quadrature LO frequencies to minimize the occurrence of spurs. Notably, the divided version is 1/N of the VCO frequency and the VCO frequency is a radio frequency (RF) channel frequency times a ratio N/(N−1).

REFERENCES:
patent: 5408201 (1995-04-01), Uriya
patent: 2007/0081610 (2007-04-01), Krivokapic et al.
patent: 2008/0100387 (2008-05-01), Chen et al.

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