Switch module, front-end module, and driving method for switch module

Abstract

A switch module capable of reducing a signal propagation loss in a system capable of selecting a CA mode and a non-CA mode. A switch module (10) can select a CA mode that uses the first frequency band and the second frequency band at the same time, and a non-CA mode that uses only one of the first frequency band and the second frequency band, comprising: a first signal path (23M) for propagating one frequency band, a second signal path (23H) for propagating a second frequency band, and a third signal path (23B) for propagating a signal of the first frequency band and a signal of the second frequency band simultaneously. A switch circuit (20) switches the connection between any one of the three signal paths and the antenna element (2). A variable adjustment section (25) adjusts a variable matching circuit of the third signal path (23B) when the non-CA mode is selected or adjusts the variable matching circuit of the first signal path (23M) or the second signal path (23H) when the CA mode is selected.

Description

technical field [0001] The invention relates to a switch module, a front-end module and a driving method of the switch module used in wireless communication. Background technique [0002] In order to cope with international roaming and increase in communication speed, etc., mobile phones are expected to support multiple frequencies and wireless systems (multi-band and multi-mode) with one terminal. [0003] Patent Document 1 discloses a 1-input n-output type sPnT (Single Pole n Throw) switch that simultaneously connects one common terminal and two or more selection terminals, a variable impedance adjustment circuit connected thereafter, and further The front-end circuit corresponding to the carrier aggregation (CA) of the duplexer connected to the subsequent stage. According to the above configuration, even when different frequency bands are used simultaneously, it is possible to prevent signal leakage to other circuits. [0004] Patent Document 1: Japanese Patent Laid-Ope...

AI Technical Summary

Problems solved by technology

In particular, when the CA-compatible front-end circuit is operated in a non-CA mode, multiple signal paths are connected to the switch, so impedance mismatch is likely to occur due to parasitic components inside the switch, etc.

Therefore, there is a problem that the loss of the signal increases and the pass characteristic deteriorates.

Images