Voltage-controlled oscillator, high-frequency module, and communication apparatus
First Claim
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1. A voltage-controlled oscillator comprising:
- a resonant circuit; and
an active circuit for amplifying a signal output from the resonant circuit;
wherein said resonant circuit includes a resonator having a predetermined resonant frequency, a variable capacitance diode connected to the resonator for shifting the resonant frequency according to a control voltage, a transmission line connected between the resonator and the variable capacitance diode, and a capacitive circuit connected in parallel with the variable capacitance diode.
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Abstract
A voltage controlled oscillator includes a resonant circuit which is connected with an active circuit. In the resonant circuit, a variable capacitance diode is connected with a resonator via a transmission line, and a capacitive circuit is connected in parallel with the variable capacitance diode. By setting the length of the transmission line to an appropriate value ranging from, for example, about one quarter to about one half of the wavelength of the resonant frequency, the frequency change width can increase, while maintaining the frequency linearity because of connection of the capacitive circuit.
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Citations
17 Claims
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1. A voltage-controlled oscillator comprising:
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a resonant circuit; and
an active circuit for amplifying a signal output from the resonant circuit;
wherein said resonant circuit includes a resonator having a predetermined resonant frequency, a variable capacitance diode connected to the resonator for shifting the resonant frequency according to a control voltage, a transmission line connected between the resonator and the variable capacitance diode, and a capacitive circuit connected in parallel with the variable capacitance diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification