Patent ID: 6992536

Claim:
A voltage-controlled oscillator for generating an oscillation signal with a frequency corresponding to first and second control voltages, the voltage-controlled oscillator comprising: a first current source for generating a first control current in accordance with the first control voltage, with the first current source varying a changing amount of the first control current relative to a change in the first control voltage; a second current source for generating a second control current in accordance with the second control voltage, with the second current source varying a changing amount of the second control current relative to a change in the second control voltage; a control voltage generation circuit connected to the first and second current sources to synthesize a synthesized current from the first and second control currents and generate an oscillation control voltage in accordance with the synthesized current; and a ring oscillator connected to the control voltage generation circuit to generate the oscillation signal with a frequency corresponding to the oscillation control voltage.