| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage controlled oscillation circuit of a RTW (Rotary Traveling-Wave) system improved in phase/noise characteristics by using a variable capacitance element, that is employed generally, without adding manufacturing costs. SOLUTION: The voltage controlled oscillation circuit includes: a loop-shaped transmission line 15; an active circuit 17 connected to a signal line; and a variable capacitor 21 connected to the signal line and having a plurality of variable capacitance units 23. Each variable capacitance unit 23 includes a variable capacitance element 31, a control terminal 41 for applying a control potential to the variable capacitance element 31, and a reference potential terminal 43 for applying a reference potential to the variable capacitance element 31. Between at least two variable capacitance units 23, reference potentials are different from each other. COPYRIGHT: (C)2010,JPO&INPIT |
