| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage-controlled oscillation circuit capable of accurately adjusting the amount of change of a frequency with respect to a control voltage concerning the voltage-controlled oscillation circuit and its adjustment method. SOLUTION: The voltage-controlled oscillation circuit includes: a variable capacitor where a capacitance component is controlled in response to the control voltage; a serial capacitor serially connected to the variable capacitor; a parallel capacitor connected to a serial circuit in parallel, which is composed of the variable capacitor and the serial capacitor; and an inductor which is connected to the serial circuit in parallel composed of the variable capacitor and the serial capacitor, so as to constitute an inductive component. The serial capacitor and the parallel capacitor are respectively exchangeable in capacitance components. When the capacitance component of the serial capacitor and that of the parallel capacitor are exchanged, the amount of change of the oscillation frequency with respect to the control voltage is adjusted. COPYRIGHT: (C)2008,JPO&INPIT
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