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US 2014/0368290 A1Published application
Variable inductor circuit and high frequency circuit
AssigneeFujitsu Limited
InventorMASARU SATO
Life of this patent
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Abstract
A first transistor and a second transistor cascade-connected, a wiring which connects a drain of the first transistor and a gate of the second transistor, a capacitor 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 are included. The control circuit adjusts an inductance value by controlling a capacitance value of the capacitor or gate voltage of the first transistor or the second transistor.
Claims7
A variable inductor circuit comprising:
- a first transistor and a second transistor cascade-connected;
- a wiring which connects a drain of the first transistor and a gate of the second transistor;
- a capacitor whose one terminal is connected between the first transistor and the second translator cascade-connected, and whose other terminal is grounded;
- and
- a control circuit which adjusts an inductance value by controlling a capacitance value of the capacitor or gate voltage of the first transistor or the second transistor.
2 more elements
A high frequency circuit comprising:
- a first transistor which receives a signal;
- and
- a matching circuit which is connected to the first transistor, which performs impedance matching, and which includes a variable inductor circuit, the variable inductor circuit including:
- a second transistor and a third transistor cascade-connected;
- a wiring which connects a drain of the second transistor and a gate of the third transistor;
- a capacitor whose one terminal is connected between the second transistor and the third transistor cascade-connected and whose other terminal is grounded;
- and
- a control circuit which adjusts an inductance value by controlling a capacitance value of the capacitor or gate voltage of the second transistor or the third transistor.
5 more elements
Dependencies are inferred from the claim text.