Voltage-controlled oscillator for multi-band and RF...

Oscillators – Solid state active element oscillator – Transistors

Reexamination Certificate

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Reexamination Certificate

active

07626470

ABSTRACT:
A voltage-controlled oscillator (VCO) for a multi-band receiver, and a radio-frequency (RF) communication apparatus having the same. The VCO includes at least two fine tune branches, that is, a main fine tune branch and an auxiliary fine tune branch. The main fine tune branch includes at least one variable capacitor whose capacitance varies according to a tuning voltage. The auxiliary fine tune branch includes at least one varactor that operates either as a variable capacitor whose capacitance varies according to the tuning voltage or a fixed capacitor regardless of the tuning voltage, based on an operating frequency band. Accordingly, it is possible to prevent phase noise from increasing by varying the gain of the VCO according to the frequency band of an oscillation signal from the VCO.

REFERENCES:
patent: 6621365 (2003-09-01), Hallivuori et al.
patent: 7209017 (2007-04-01), Sze et al.
patent: 7323944 (2008-01-01), Florescu et al.
patent: 2004-048589 (2004-02-01), None
patent: 2004-120215 (2004-04-01), None
patent: 1020030053791 (2003-07-01), None

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