Patent ID: 6791425
Filing Date: 2004-09-14
Classification: H03B,H03J

Abstract:
An LC oscillator that varies its oscillation frequency between a predetermined maximum oscillation frequency and minimum oscillation frequency, said LC oscillator comprising:inductors; variable capacitor means for varying its capacitance in response to a control voltage supplied in accordance with a digital control signal; additional variable capacitor means for varying its capacitance in response to an additional control voltage; and adjusting means for adjusting the oscillation frequency to one of the maximum oscillation frequency and minimum oscillation frequency by varying the capacitance of said variable capacitor means by the control voltage when the digital control signal is set to a predetermined value, wherein said additional variable capacitor means adjusts the oscillation frequency to the other of the maximum oscillation frequency and minimum oscillation frequency by varying its capacitance by the additional control voltage when the digital control signal is set to the predetermined value.