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US 8,008,973 B2Granted
Amplifier for amplifying a high-frequency signal
AssigneeKabushiki Kaisha Toshiba
InventorRyuichi Fujimoto
Life of this patent
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Abstract
A transistor is provided to amplify a high frequency signal. A gate/base of the transistor receives the high frequency input signal. A variable capacitor is connected between the gate and a source/between the base and an emitter of the transistor. A variable inductor is connected with the source/the emitter of the transistor.
Claims15
An amplifier comprising:
- a transistor to amplify a high frequency signal, a gate/base of the transistor receiving the high frequency input signal;
- a variable capacitor connected between the gate and a source/between the base and an emitter of the transistor;
- and
- a variable inductor connected with the source/the emitter of the transistor.
1 more element
An amplifier having a high frequency signal input terminal and a high frequency signal output terminal, comprising:
- a plurality of transistors to amplify a high frequency signal, gates/bases of the transistors being connected with the high frequency signal input terminal, drains/collectors of the transistors being connected with the high frequency signal output terminal;
- a plurality of variable capacitors connected between the gates and sources/between the bases and emitters of the transistors respectively;
- a plurality inductors connected with the sources/the emitters of the transistors and mutually coupled with each other electromagnetically;
- and
- an On/OFF control circuit to control the potentials of the gates/the bases of the transistors respectively, the On/OFF control circuit turns on/off the transistors selectively.
2 more elements
An amplifier having a high frequency signal input terminal and a high frequency signal output terminal, comprising:
- a plurality of transistors to amplify a high frequency signal, gates/bases of the transistors being connected with the high frequency signal input terminal, drains/collectors of the transistors being connected with the high frequency signal output terminal;
- a plurality of variable capacitors connected between the gates and sources/between the bases and emitters of the transistors respectively;
- a plurality inductors connected with the sources/the emitters of the transistors and mutually coupled with each other electromagnetically;
- and
- a bias control circuit to control the bias potentials of the gates/the bases of the transistors respectively, the bias control circuit regulate currents flowing through the transistors respectively.
2 more elements
Dependencies are inferred from the claim text.