Invention Grant
- Patent Title: Radio frequency front-end circuit
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Application No.: US15235295Application Date: 2016-08-12
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Publication No.: US09960898B2Publication Date: 2018-05-01
- Inventor: Takanori Uejima , Hiromichi Kitajima , Saneaki Ariumi , Hisao Hayafuji , Tatsuya Tsujiguchi
- Applicant: Murata Manufacturing Co., Ltd.
- Applicant Address: JP Kyoto
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett, LLP
- Priority: JP2014-029839 20140219
- Main IPC: H04B1/10
- IPC: H04B1/10 ; H03K5/01 ; H04L1/00 ; H04B1/38 ; H04L5/12 ; H04B1/52 ; H04B1/04 ; H04B1/18 ; 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.
Public/Granted literature
- US20160352494A1 RADIO FREQUENCY FRONT-END CIRCUIT Public/Granted day:2016-12-01
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