Patent ID: 7312670

Claim:
Voltage controlled oscillator comprising an oscillating system with a first variable capacitor having a capacitance varying according to the control voltage of the oscillator, oscillator comprising a second variable capacitor having a capacitance varying according to the voltage applied thereto, switching means connected to the first and second variable capacitors, and control means for controlling the switching means causing, according to the output frequency of the oscillator, one of the variable capacitors to be replaced by the other in the oscillating system, the capacitance of one of the variable capacitors varying in the same direction as the voltage that is applied thereto and the capacitance of the other variable capacitor varying in the opposite direction to the voltage that is applied thereto, wherein the maximum oscillation frequency of the system with said first variable capacitor is equal to or lower than the minimum oscillation frequency of the oscillating system with said second variable capacitance.