| 摘要 |
A front-end circuit includes a power amplifier circuit, a low noise amplifier circuit, a connection switching circuit, a bypass circuit and an attenuation unit. The connection switching circuit switches connections in response to a control signal. The bypass circuit forms a bypass in response to a control signal. The attenuation unit includes a plurality of attenuation circuits. The plurality of attenuation circuits include attenuation circuits. In the case where an antenna terminal is electrically connected to the power amplifier circuit, the attenuation circuits attenuate a branch signal leaked from the transmission signal into a transfer line for transferring the reception signal in response to the control signal. In the case where the antenna terminal is electrically connected to the low noise amplifier circuit, the attenuation circuit attenuates the reception signal in the transfer line in response to the control signal. |
