Voltage-controlled oscillator
AssigneeNEC Electronics Corporation
InventorYoshiaki NAKAMURA
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Abstract
A voltage-controlled oscillator includes a resonator section in which a plurality of types of variable capacitance elements having different structures and capacitance variation characteristics are connected in parallel and capacitance values of the plurality of types of variable capacitance elements are controlled simultaneously by a control voltage; and an amplifier section for maintaining oscillation produced by the resonator section. Varactor diodes and MOS varactors can be used as the variable capacitance elements.
Claims20
A voltage-controlled oscillator comprising:
- a resonator section in which a plurality of types of variable capacitance elements having different structures and capacitance variation characteristics are connected in parallel and capacitance values of said plurality of types of variable capacitance elements are controlled simultaneously by a control voltage;
- and
- an amplifier section that maintains oscillation produced by said resonator section.
A voltage-controlled oscillator comprising a resonator section, and an amplifier section that maintains oscillation produced by said resonator section, wherein said resonator section comprises:
- an inductor;
- first MOS varactor and second MOS varactor connected between respective ones of two ends of said inductor and a common node;
- first varactor diode and second varactor diode connected between respective ones of two ends of said inductor and a power supply so as to be reverse biased;
- a first resistor R1 connected between the common node and a voltage control terminal;
- and
- second and third resistors connected between respective ones of two ends of said inductor and the voltage control terminal.
A voltage-controlled oscillator comprising a resonator section, and an amplifier section that maintains oscillation produced by said resonator section, wherein said resonator section comprises:
- a first inductance connected between the power supply and a first node;
- a second inductance connected between the power supply and a second node;
- a first varactor diode connected between a third node, which is connected to the voltage control terminal via a resistor, and the first node so as to be reverse biased;
- a second varactor diode connected between the third node and the second node so as to be reverse biased;
- first and second MOS varactor each having a first end connected to the third node;
- a first fixed capacitor connected between a second end of said first MOS varactor and the first node;
- and
- a second fixed capacitor connected between a second end of said second MOS varactor and the second node.
Dependencies are inferred from the claim text.