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1. (WO2018051864) HIGH-FREQUENCY FRONT-END CIRCUIT AND COMMUNICATION APPARATUS

Pub. No.:    WO/2018/051864    International Application No.:    PCT/JP2017/032149
Publication Date: Fri Mar 23 00:59:59 CET 2018 International Filing Date: Thu Sep 07 01:59:59 CEST 2017
IPC: H03H 7/46
H03H 9/58
H03H 9/64
H03H 9/70
H03H 9/72
H04B 1/00
H04B 1/40
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: MATSUTANI, Kei
松谷 圭
NOSAKA, Koji
野阪 浩司
Title: HIGH-FREQUENCY FRONT-END CIRCUIT AND COMMUNICATION APPARATUS
Abstract:
A high-frequency front-end circuit (1) is provided with a frequency variable type filter (20) that is connected to a selection terminal (112) of a switching circuit (10), and a filter (30) that is connected to a selection terminal (113) of the switching circuit (10), wherein the switching circuit (10) has a switch (12a) that switches conduction and non-conduction between a shared terminal (111) and the selection terminal (112), the filter (20) has: a serial arm resonance circuit (s20) that is connected to the selection terminal (112); a parallel arm resonator (p1); and a frequency variable circuit (11) which is connected in series to the parallel arm resonator (p1) and in which a capacitor (C1) and a switch (SW) are connected in parallel, the frequency variable circuit (11) makes the frequency of the filter (20) variable through conduction or non-conduction set by the switch (SW), and ON resistance of the switch (12a) is smaller than that of the switch (SW).