Patent ID: 7518458

Claim:
An oscillator comprising: first and second power source voltage terminals of parallel capacitors; first and second power source voltage terminals of series capacitors; an inductor connected between the first power source voltage terminal of parallel capacitors and the second power source voltage terminal of parallel capacitors; a parallel capacitor including a first capacitor bank composed of variable capacitors which are connected in parallel and whose capacitance values vary from small to large value according to a first control signal group and a first fine adjustable capacitor whose capacitance value varies according to a second control signal, the first capacitor bank and the first fine adjustable capacitor being connected to each other in parallel between the first power source voltage terminal of parallel capacitors and the second power source voltage terminal of parallel capacitors; and a series capacitor including a second capacitor bank composed of variable capacitors which are connected in parallel and whose capacitor values vary from small to large value according to a third control signal group and a second fine adjustable capacitor whose capacitance value varies according to the second control signal, the second capacitor bank and the second fine adjustable capacitor being connected to each other in series between the first power source voltage terminal of series capacitors and the second power source voltage terminal of series capacitors.