Murata Manufacturing Co., Ltd.

Shinya Hitomi

Hidenori Obiya

Hirotsugu Mori

Shinya Mizoguchi

Reiji Nakajima

Yuichi Tannan

Hisao Hayafuji

Masahiro Ito

Kiichiro Takenaka

Satoshi Arayashiki

Takaya Wada

Ryuken Mizunuma

Tsuyoshi Sato

Atsuyuki Yuasa

Shingo Yanagihara

Kiyofumi Takai

A radio frequency module includes: a first filter circuit disposed on a first path that connects an antenna terminal and a first input/output terminal, and having a passband that is a first frequency band; a second filter circuit disposed on a second path that connects the antenna terminal and a second input/output terminal, and having a passband that is a second frequency band higher than the first frequency band; and a band-elimination filter circuit disposed on the second path and having an attenuation band that is a partial band of a third frequency band that belongs to an unlicensed band ranging from 5 GHz or higher, and is higher than the second frequency band. The second filter circuit is an LC filter circuit that includes an inductor and a capacitor.

Radio frequency module and communication device

A communication circuit includes a first transfer circuit that includes a first transmitter circuit, and a second transfer circuit that includes a second transmitter circuit that can transmit a signal simultaneously with the first transmitter circuit. The second transmitter circuit is configured to be placed in a transmission halt state when transmission power of the second transmitter circuit resulting from being decreased by a predetermined value is lower than or equal to a threshold.

Communication circuit and control method for communication circuit

A radio-frequency circuit includes a power amplifying circuit configured to amplify a first radio-frequency signal having a first channel bandwidth and a second radio-frequency signal having a second channel bandwidth greater than the first channel bandwidth. The power amplifying circuit is configured to amplify the first radio-frequency signal in an amplifying mode according to an average power tracking method, and to amplify the second radio-frequency signal in an amplifying mode according to an envelope tracking method.

Radio-frequency circuit and communication device

A radio-frequency circuit includes a first power amplifier that outputs a first transmission signal and a second power amplifier that outputs a second transmission signal having a frequency different from a frequency of the first transmission signal. In a period in which the first transmission signal the second transmission signal are simultaneously outputted, at least one of the first power amplifier or the second power amplifier reduces transmission power of the at least one of the first power amplifier or the second power amplifier to cause a power component of intermodulation distortion superimposed on a transmission signal output from the first power amplifier and the second power amplifier to be less than or equal to a threshold value.

Radio-frequency circuit, communication device, and antenna module

A radio-frequency circuit includes a power amplifying circuit configured to amplify a first radio-frequency signal having a first channel bandwidth and a second radio-frequency signal having a second channel bandwidth greater than the first channel bandwidth. The power amplifying circuit is configured to amplify the first radio-frequency signal in an amplifying mode according to an envelope tracking method, and to amplify the second radio-frequency signal in an amplifying mode according to an average power tracking method.

A communication circuit includes a first transfer circuit that includes a first transmitter circuit, and a second transfer circuit that includes a second transmitter circuit that can transmit a signal simultaneously with the first transmitter circuit. When a difference between requested power and scheduled power is greater than a predetermined value, the second transmitter circuit is configured to change transmission power of the second transmitter circuit to adjust the difference to a value smaller than the predetermined value, the requested power being requested transmission power, the scheduled power being transmission power to be transmitted based on the requested power.

A communication circuit includes a first transfer circuit that includes a first transmitter circuit, and a second transfer circuit that includes a second transmitter circuit that can transmit a signal simultaneously with the first transmitter circuit. The second transmitter circuit is configured to be placed in a transmission halt state when a difference between requested power and scheduled power is greater than a predetermined value, the requested power being requested transmission power, the scheduled power being transmission power to be transmitted based on the requested power.

A radio-frequency circuit includes a first power amplifier that amplifies a first transmission signal and outputs the first transmission signal amplified; and a second power amplifier that amplifies a second transmission signal different in frequency from the first transmission signal, and outputs the second transmission signal amplified. At least one of the first power amplifier or the second power amplifier switches from ET mode to APT mode, when (1) both the first power amplifier and the second power amplifier are outputting amplified transmission signals and (2) output power of at least one of the first power amplifier or the second power amplifier is greater than a first threshold power.

A high-frequency module () includes a first substrate (), a second substrate () that faces the first substrate (), a support () that supports the first substrate () and the second substrate (), and a plurality of high-frequency circuit components arranged in internal space formed by the first substrate (), the second substrate (), and the support and on both of facing principal faces of the first substrate () and the second substrate (), and the plurality of high-frequency circuit components include a power amplifier element that constitutes a power amplifier circuit ().

High-frequency module

A PA module includes a previous stage amplification element to amplify a high-frequency signal, a posterior stage amplification element to amplify the high-frequency signal amplified by the previous stage amplification element, and a variable filter circuit arranged between the previous stage amplification element and the posterior stage amplification element and to vary a pass band and an attenuation band in accordance with a frequency band of the high-frequency signal, in which the variable filter circuit includes a filter portion and switches, the previous stage amplification element, the switches, and the posterior stage amplification element are arranged on a mounting surface of a substrate, the filter portion is stacked and arranged so as to overlap with at least one of the previous stage amplification element, the switches, and the posterior stage amplification element when the substrate is viewed in a plan view.

Power amplification module, front-end circuit, and communication device

A PA module (A) includes a previous stage amplification element () to amplify a high-frequency signal, a posterior stage amplification element () to amplify the high-frequency signal amplified by the previous stage amplification element (), and a variable filter circuit arranged between the previous stage amplification element () and the posterior stage amplification element () to vary a pass band and an attenuation band in accordance with a frequency band of the high-frequency signal, in which the variable filter circuit includes a filter portion () and switches (and) to vary the pass band and the attenuation band of the variable filter circuit, and the previous stage amplification element () and at least a part of the switches (and) are formed in one chip using a chip A, the posterior stage amplification element () are included in a second chip which is different from the chip A.

A transmission-reception device includes an antenna duplexer, an antenna, and first and second transmission-reception circuits. A demultiplexer is connected between the first transmission-reception circuit and the antenna duplexer, and a multiplexer is connected between the second transmission-reception circuit and the antenna duplexer. A signal adjusting unit is connected between the demultiplexer and the multiplexer. The amplitude and phase of a third harmonic signal of a first transmission signal reflected by the antenna are detected. The signal adjusting unit adjusts the amplitude and phase of the third harmonic signal demultiplexed by the demultiplexer on the basis of the detection results, and outputs a cancel signal. The multiplexer synthesizes and hence cancels the third harmonic signal reflected by the antenna and the cancel signal with each other.

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Kyoto, Japan

Shinya Hitomi