Patent ID: 11955931
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power amplifier unit comprising:
a power amplifier circuit that has a first input terminal and a first output terminal, the power amplifier circuit being configured to amplify a first radio-frequency signal containing a fundamental and input to the first input terminal and being configured to output a second radio-frequency signal containing a fundamental, an even-ordered harmonic, and an odd-ordered harmonic from the first output terminal;
a first impedance matching circuit that has a second input terminal and a second output terminal, the second input terminal being connected to the first output terminal of the power amplifier circuit, and the first impedance matching circuit being configured to output the second radio-frequency signal, input to the second input terminal, from the second output terminal as a third radio-frequency signal and convert an impedance between the second input terminal and the second output terminal;
a tunable harmonic termination circuit that has a third input terminal and a third output terminal, the third input terminal being connected to the second output terminal of the first impedance matching circuit, and the tunable harmonic termination circuit being configured to reflect at least part of the even-ordered harmonic and the odd-ordered harmonic contained in the third radio-frequency signal input to the third input terminal to output the at least part of the even-ordered harmonic and the odd-ordered harmonic from the third input terminal as a fourth radio-frequency signal and output a fifth radio-frequency signal, containing the fundamental and the remainder of the even-ordered harmonic and the odd-ordered harmonic, from the third output terminal such that the tunable harmonic termination circuit is configured to change the first phase or the second phase in accordance with the frequency of the fundamental;
a tunable filter that has a fourth input terminal and a fourth output terminal, the fourth input terminal being connected to the third output terminal of the tunable harmonic termination circuit, the tunable filter being configured to attenuate the at least part of the even-ordered harmonic and the odd-ordered harmonic contained in the fifth radio-frequency signal input to the fourth input terminal and output a sixth radio-frequency signal, containing the fundamental and the remainder of the even-ordered harmonic and the odd-ordered harmonic, from the fourth output terminal, and the tunable filter having frequency characteristics including a first frequency range in which part of the fifth radio-frequency signal is allowed to pass to the fourth output terminal, and a second frequency range in which part of the fifth radio-frequency signal input to the fourth input terminal is attenuated, and being configured to change between the first frequency range and the second frequency range in accordance with the fundamental;
a band select switch that has a fifth input terminal and a plurality of fifth output terminals, the fifth input terminal being connected to the fourth output terminal of the tunable filter, and the band select switch being configured to select a propagation path of a radio-frequency signal by connecting the fifth input terminal with at least one of the fifth output terminals in accordance with the frequency of the fundamental;
a plurality of second impedance matching circuits respectively in association with the plurality of fifth output terminals of the band select switch, each of the second impedance matching circuits having a sixth input terminal and a sixth output terminal, the sixth input terminal being connected to an associated one of the fifth output terminals, and each of the plurality of second impedance matching circuits being configured to convert an impedance between the sixth input terminal and the sixth output terminal; and
a plurality of duplexers respectively in association with the plurality of second impedance matching circuits, each of the duplexers having a seventh input terminal, a seventh output terminal, and an input/output terminal, the seventh input terminal being connected to the sixth output terminal of an associated one of the second impedance matching circuits, an eighth radio-frequency signal being output from the input/output terminal in accordance with the frequency of a seventh radio-frequency signal input to the seventh input terminal, and a tenth radio-frequency signal being output from the seventh output terminal in accordance with the frequency of a ninth radio-frequency signal input to the input/output terminal,
wherein
the fourth radio-frequency signal contains at least a second-order harmonic,
the second-order harmonic reaches the first output terminal of the power amplifier circuit with a first phase via the first impedance matching circuit, and
the eighth radio-frequency signal or the tenth radio-frequency signal is output via the second impedance matching circuit and the duplexer that are connected to the propagation path selected by the band select switch.