| 摘要 |
A first transistor (Trl ,Tr5) and a second transistor (Tr2,Tr4) cascade-connected, a wiring (lnl,ln2) which connects a drain of the first transistor and a gate of the second transistor, a capacitor (C1) whose one terminal is connected between the first transistor and the second transistor cascade-connected and whose other terminal is grounded, and a control circuit (2, 2a, 30, 40) are included in a variable inductor circuit. A control circuit adjusts the inductance value of said variable inductor by controlling a capacitance value of the capacitor or gate voltage of the first transistor or the second transistor. |
