Frequency synthesizing apparatus and method having...

Oscillators – Beat frequency – Frequency stabilization

Reexamination Certificate

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C331S040000

Reexamination Certificate

active

07656238

ABSTRACT:
A frequency synthesizing apparatus and method having an injection-locked quadrature VCO in an RF transceiver is provided. In the frequency synthesizer, an I signal following a frequency of a high frequency signal that is input using the injection-locked quadrature VCO and a Q signal thereof are simultaneously generated to have an appropriate driving power. Accordingly, the I signal and the Q signal thereof that are generated in the injection-locked quadrature VCO may be utilized as a local signal for frequency up/down-conversion, without being buffered. An output of an SSB mixer may be directly input into the injection-locked quadrature VCO. Also, high frequency signals that are generated in another circuit such as the SSB mixer, a PLL, or a VCO may be selected to be input into the injection-locked quadrature VCO by a selector.

REFERENCES:
patent: 5343168 (1994-08-01), Guthrie
patent: 6175285 (2001-01-01), Gabara
patent: 6960962 (2005-11-01), Peterzell et al.
patent: 57-125528 (1982-08-01), None
patent: 10-2002-0006155 (2002-01-01), None
patent: 10-2005-0008463 (2005-01-01), None
patent: 10-2005-0008464 (2005-01-01), None

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