公开(公告)号：US20160352365A1

公开(公告)日：2016-12-01

申请号：US15235267

申请日：2016-08-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takanori UEJIMA ,  Hiromichi KITAJIMA ,  Saneaki ARIUMI ,  Hisao HAYAFUJI ,  Tatsuya TSUJIGUCHI

IPC: H04B1/00

CPC classification number: H04B1/0057 ,  H04B1/0458 ,  H04B1/52

Abstract: A high-frequency front end circuit includes a duplexer, a phase adjustment circuit, and a power amplifier. The phase adjustment circuit is connected between the power amplifier and a transmission filter of the duplexer. The phase adjustment circuit carries out phase adjustment so that a quadrant in which an impedance ZRX (fr0) seen from the transmission filter toward the power amplifier at the fundamental frequency of a reception signal is present and a quadrant in which an impedance ZTX (fr0) seen from the power amplifier toward the transmission filter at the fundamental frequency of the reception signal is present are not in a conjugate relationship with respect to the phase.

Abstract translation: 高频前端电路包括双工器，相位调整电路和功率放大器。 相位调整电路连接在功率放大器和双工器的发送滤波器之间。 相位调整电路进行相位调整，使得存在从发送滤波器向接收信号的基频看到的功率放大器的阻抗ZRX（fr0）的象限和存在阻抗ZTX（fr0）的象限， 从功率放大器向接收信号的基频处的发送滤波器看到的相对于相位不是共轭关系。

公开(公告)号：US20160352494A1

公开(公告)日：2016-12-01

申请号：US15235295

申请日：2016-08-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takanori UEJIMA ,  Hiromichi KITAJIMA ,  Saneaki ARIUMI ,  Hisao HAYAFUJI ,  Tatsuya TSUJIGUCHI

IPC: H04L5/12 ,  H04L5/10 ,  H04B1/04

CPC classification number: H04L5/12 ,  H04B1/0458 ,  H04B1/18 ,  H04B1/52 ,  H04L5/10

Abstract: A radio frequency front-end circuit includes a duplexer, a phase adjustment circuit, and a low noise amplifier. The phase adjustment circuit is connected between an Rx filter of the duplexer and the low noise amplifier. The phase adjustment circuit executes phase adjustment such that a quadrant in which an impedance ZLNA(fn) at a particular frequency different from a fundamental frequency of a reception signal when looking at the low noise amplifier side from the Rx filter is present and a quadrant in which an impedance ZRX(fn) at the particular frequency when looking at the Rx filter side from the low noise amplifier is present are not in a conjugate relation in terms of phase.

Abstract translation: 射频前端电路包括双工器，相位调整电路和低噪声放大器。 相位调整电路连接在双工器的Rx滤波器和低噪声放大器之间。 相位调整电路执行相位调整，使得在存在从Rx滤波器观看低噪声放大器侧时，与接收信号的基频不同的特定频率处的阻抗ZLNA（fn）存在的象限， 当从低噪声放大器观看Rx滤波器侧时，在特定频率处的阻抗ZRX（fn）在相位方面不是共轭关系。