Amplification circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorKoudai Sugiyama
Life of this patent
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Abstract
An amplification circuit includes a first amplifier provided between an input terminal and an output terminal and a second amplifier connected in parallel with the first amplifier between the input terminal and the output terminal. The first amplifier includes a transistor and a transistor, which are cascode connected with each other. The second amplifier includes a transistor. The transistor has a gate connected to the input terminal, a source connected to ground, and a drain. The transistor has a gate, a source connected to the drain of the transistor, and a drain connected to the output terminal. The transistor has a gate connected to the input terminal, a source connected to ground, and a drain connected to the output terminal.
Claims14
An amplification circuit comprising:
- a first amplifier connected between an input terminal to which a radio-frequency signal is input and an output terminal from which a radio-frequency signal is output;
- and
- a second amplifier connected in parallel with the first amplifier between the input terminal and the output terminal,
- wherein the first amplifier comprises a first transistor and a second transistor that are cascode connected with each other,
- wherein the second amplifier comprises a third transistor,
- wherein the first transistor has a first terminal that is a gate or base connected to the input terminal, a second terminal that is a source or emitter connected to ground, and a third terminal that is a drain or collector,
- wherein the second transistor has a fourth terminal that is a gate or base, a fifth terminal that is a source or emitter connected to the third terminal, and a sixth terminal that is a drain or collector connected to the output terminal,
- wherein the third transistor has a seventh terminal that is a gate or base connected to the input terminal, an eighth terminal that is a source or emitter connected to ground, and a ninth terminal that is a drain or collector connected to the output terminal,
- wherein the amplification circuit is configured to selectively switch between amplification of a radio-frequency signal input to the input terminal using the first amplifier and amplification of the radio-frequency signal input to the input terminal using the second amplifier,
- wherein a bias supplied to the first terminal and a bias supplied to the seventh terminal are different from each other, and
- wherein a bias supplied to the fourth terminal and a bias supplied to the seventh terminal are different from each other.
Dependencies are inferred from the claim text.