| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator in which the movable range of an oscillation frequency is wide, circuit scale is reduced and phase noise characteristics are excellent. SOLUTION: In the voltage controlled oscillator, a reference voltage to be applied to one terminal of each of variable capacitors Cv1 and Cv2 and a reference voltage to be applied to one terminal of each of variable capacitors Cv21 and Cv22 are made different. A control voltage V<SB>CTL</SB>is applied to the other terminal of each of the variable capacitors Cv1, Cv2, Cv21 and Cv22. One terminal of the variable capacitor Cv1 and one terminal of the variable capacitor Cv21 are connected via a fixed capacitor C21. One terminal of the variable capacitor Cv2 and one terminal of the variable capacitor Cv22 are connected via a fixed capacitor C22. The oscillation frequency is controlled in accordance with the control voltage V<SB>CTL</SB>. COPYRIGHT: (C)2004,JPO
|
