| 摘要 |
A voltage-controlled oscillator has: an LC resonant circuit including an inductor and a variable capacitor that are connected in parallel between a pair of output terminals; a plurality of negative resistance circuits provided between a power source and the LC resonant circuit; a plurality of capacitor groups; a first switch circuit selecting an arbitrary number of negative resistance circuit from the plurality of negative resistance circuits; and a second switch circuit selecting an arbitrary number of capacitor group from the plurality of capacitor groups. The LC resonant circuit and the selected capacitor group constitute a resonant circuit. The resonant circuit is electrically connected to the power source through the selected negative resistance circuit, oscillates at an oscillation frequency depending on total capacitance of the resonant circuit, and outputs a differential signal of the oscillation frequency from the pair of output terminals. |
