| US 7,457,600 B2 | ||
| VCO device | ||
| Takeshi Fujii, Osaka (Japan); Kenji Adachi, Aichi (Japan); Hiroaki Ozeki, Osaka (Japan); and Mineyuki Iwaida, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/526,472 PCT Filed Jun. 24, 2004, PCT No. PCT/JP2004/009287 § 371(c)(1), (2), (4) Date Oct. 26, 2005, PCT Pub. No. WO2005/002056, PCT Pub. Date Jan. 06, 2005. |
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| Claims priority of application No. 2003-184169 (JP), filed on Jun. 27, 2003. | ||
| Prior Publication US 2006/0128335 A1, Jun. 15, 2006 | ||
| Int. Cl. H04B 7/00 (2006.01) | ||
| U.S. Cl. 455—258 [455/255; 455/147] | 10 Claims |
| 1. A Voltage-Controlled Oscillator (“VCO”) device comprising:
a plurality of VCO circuits configured to oscillate signals of frequencies corresponding to a control voltage applied to a
frequency control voltage terminal, in different oscillation frequency ranges;
a variable current source circuit configured to respectively set a driving current of each of oscillation transistors included
in the plurality of VCO circuits;
a signal selecting means configured to select an output signal from the plurality VCO circuits;
a PLL configured to frequency-divide a local signal selected by the signal selecting means, compare a phase thereof with a
phase of a reference signal and output a signal converted from a phase difference; and
a loop filter configured to smooth the output signal from the PLL and output the control voltage for controlling the oscillation
frequency.
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