Voltage controlled oscillator, and PLL circuit and wireless...

Details Voltage controlled oscillator, and PLL circuit and wireless... Voltage controlled oscillator, and PLL circuit and wireless...

2009-03-17

2011-11-29

Johnson, Ryan (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S179000, C331S03600C, C331S1170FE

Reexamination Certificate

active

08067995

ABSTRACT:
A voltage controlled oscillator includes first and second variable capacitance circuits 120 and 130, and first and second capacitance switch circuits 140 and 150. A control voltage Vt is fixedly applied to the first variable capacitance circuit 120, and control signals Fsel2 and Fsel3 are fixedly applied to the first and second capacitance switch circuits 140 and 150, respectively. When both of the control signals Fsel2 and Fsel3 are at a low level, the control signal Fsel1 is applied to the second variable capacitance circuit 130. When the control signals Fsel2 and Fsel3 are both not at the low level, the control voltage Vt is applied to the second variable capacitance circuit 130. As a result of this control, a high-frequency variable range is divided into two variable ranges, one based on upper frequencies and the other based on lower frequencies. This enables suppression of a frequency sensitivity without narrowing the high-frequency variable range.

REFERENCES:
patent: 7170358 (2007-01-01), Tsukizawa et al.
patent: 2003/0227341 (2003-12-01), Sawada
patent: 2005/0190002 (2005-09-01), Takinami et al.
patent: 2007/0075798 (2007-04-01), Amano
patent: 2003-324316 (2003-11-01), None
patent: 2004-15387 (2004-01-01), None
patent: 2004-147310 (2004-05-01), None
patent: 2007-104152 (2007-04-01), None
International Search Report issued Jun. 2, 2009 in International (PCT) Application No. PCT/JP2009/001189.

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