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...

2007-01-30

2007-01-30

Mis, David (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S03600C, C331S1170FE, C331S179000

Reexamination Certificate

active

11150151

ABSTRACT:
A voltage controlled oscillator comprises a parallel resonance circuit including an inductor circuit, a variable capacitance circuit, and a high-frequency switch circuit, a negative resistance circuit and a frequency control section, and a frequency tuning sensitivity control section. The frequency control section shifts a band of an oscillation frequency by controlling ON/OFF of a switching element included in the high-frequency switch circuit. The frequency tuning sensitivity control section adjusts a change rate of a total capacitance of the variable capacitance circuit with respect to a control voltage, depending on a band to be used. The frequency tuning sensitivity control section is connected to a virtual ground point of a differential signal.

REFERENCES:
patent: 6879218 (2005-04-01), Fujita
patent: 2003-174320 (2003-06-01), None
patent: 2003-324316 (2003-11-01), None
patent: 2004-15387 (2004-01-01), None
patent: 2004-147310 (2004-05-01), None
Koji Takinami et al., “A Wide Tuning Range LC-VCO for 5GHZ Wireless Lan Using a Tuning Sensitivity Linearization Technique”, 2003 Asia-Pacific Microwave Conference.

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