| 摘要 |
PURPOSE: A voltage control oscillator is provided to miniaturize product size for simplicity of circuit to widen variable extent of capacitance by influencing capacitance change of all tank circuit. CONSTITUTION: An oscillation part(21) performs amplification function, and at the same time, creates oscillation frequency corresponding with inputted voltage. A tank circuit(22) offers to the oscillation part frequency by LC resonance as the voltage value with storing energy for input voltage to offer. A capacitor(Cc1) for direct-current-element-elimination is connected between output terminal of the tank circuit(22) and input terminal of oscillation part(21), and eliminates direct-current-element. The input voltage terminal of tank circuit is connected with the first coil(L1) and another terminal of the first coil(L1) is connected with cathode terminal. Input voltage terminal of anode is connected with a varactor diode(Cv) connected with grounding terminal. Another terminal of anode is connected with the first capacitor(C1) connected with grounding terminal.
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