| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage-controlled oscillator for increasing a variable amount in the oscillation frequency. SOLUTION: In the voltage-controlled oscillator, a resistor R1 and a capacitor C1 are connected in series on a line between a crystal oscillator and a control voltage supply terminal 13, a cathode of a variable-capacitance diode VD1 is connected between the resistor R1 and the capacitor C1 to ground an anode, a parallel connection circuit, where a serially-connected variable-capacitance diode VD2 and a capacitor C3, an extension coil L1, and a Q damping resistor R6 are connected in parallel, is provided between the capacitor C1 and a port connected to the crystal oscillator, an input side of the parallel connection circuit is grounded via a resistor R4, and a point between the resistor R1 and the capacitor C1 is connected to a point between the variable-capacitance diode VD2 and the capacitor C3 via a resistor R5. COPYRIGHT: (C)2011,JPO&INPIT
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