Power amplifier module
AssigneeMurata Manufacturing Co., Ltd.
InventorsShota Ishihara, Yuji Shintomi, Satoshi Matsumura
Life of this patent
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Abstract
A power amplifier module includes an amplifier that amplifies an input signal and outputs the amplified signal, a harmonic termination circuit that is disposed subsequent to the amplifier and that attenuates a harmonic component of the amplified signal, the harmonic termination circuit including at least one field effect transistor (FET), and a control circuit that controls a gate voltage of the at least one FET to adjust a capacitance value of a parasitic capacitance of the at least one FET. The control circuit adjusts the capacitance value of the parasitic capacitance of the at least one FET, and thereby a resonance frequency of the harmonic termination circuit is adjusted.
Claims5
A power amplifier module comprising:
- an amplifier that amplifies an input signal and outputs the amplified signal;
- an impedance adjustment circuit that is disposed subsequent to the amplifier and that is configured to change an impedance of the amplified signal, the impedance adjustment circuit comprising at least one field effect transistor;
- and
- a control circuit configured to control a gate voltage of the at least one field effect transistor thereby adjusting a parasitic capacitance of the at least one field effect transistor,
- wherein by adjusting the parasitic capacitance of the at least one field effect transistor, the control circuit thereby also adjusts an impedance of the impedance adjustment circuit,
- wherein the impedance adjustment circuit comprises a first inductor connected between an output of the amplifier and a reference potential, and
- wherein the at least one field effect transistor is connected in parallel with the first inductor.
Dependencies are inferred from the claim text.