Power amplifier circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsYuri HONDA, Satoshi GOTO, Fumio HARIMA
Life of this patent
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Abstract
A power amplifier circuit includes a power splitter, a first amplifier configured to output a first amplified signal from a first output terminal, and a second amplifier configured to output a second amplified signal from a second output terminal. The power amplifier circuit further includes a first termination circuit connected between the first output terminal and the second output terminal, a first transmission line, a second transmission line, a second termination circuit connected between another end of the first transmission line and another end of the second transmission line, and a power combiner.
Claims20
A power amplifier circuit comprising:
- a power splitter configured to receive an input signal through an input terminal, and to output a first signal and a second signal, the first signal and second signal having different phases;
- a first amplifier having a first input terminal and a first output terminal, and configured to output a first amplified signal from the first output terminal, the first amplified signal being obtained by amplifying the first signal input;
- a second amplifier having a second input terminal and a second output terminal, and configured to output a second amplified signal from the second output terminal, the second amplified signal being obtained by amplifying the second signal;
- a first termination circuit comprising a capacitor connected between the first output terminal and the second output terminal;
- a first transmission line having a first end connected to the first output terminal;
- a second transmission line having a first end connected to the second output terminal;
- a second termination circuit comprising a capacitor and an inductor that are connected between a second end of the first transmission line and a second end of the second transmission line;
- and
- a power combiner connected to the second end of the first transmission line and to the second end of the second transmission line, and configured to output an output signal obtained by combining the first amplified signal and the second amplified signal,
- wherein a capacitance value of the capacitor of the first termination circuit is lower than a capacitance value of the capacitor of the second termination circuit, and
- wherein an odd harmonic of the output signal is attenuated such that a ratio of the odd harmonic to a fundamental frequency in the output signal is less than a ratio of the odd harmonic to the fundamental frequency in the input signal.
Dependencies are inferred from the claim text.