High frequency circuit and high frequency module including the same

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.

主权项

1. A high frequency circuit comprising:
a power amplifier circuit configured to amplify a signal received by a signal transmission terminal and output it as a transmission signal; a low noise amplifier circuit configured to amplify a reception signal received by an antenna terminal and output said reception signal after amplification to a reception terminal; a connection switching circuit configured to switch a connection between said antenna terminal and said power amplifier circuit and a connection between said antenna terminal and said low noise amplifier circuit in response to a first control signal; a bypass circuit configured to form a bypass between said connection switching circuit and said reception terminal to bypass said low noise amplifier circuit in response to a second control signal; and an attenuation unit provided on a transfer line for transferring said reception signal, said attenuation unit including a plurality of attenuation circuits, said plurality of attenuation circuits including
a first attenuation circuit configured to attenuate a branch signal leaked from said transmission signal into the transfer line for transferring said reception signal in response to said first control signal in the case where said antenna terminal is electrically connected to said power amplifier circuit by said connection switching circuit, anda second attenuation circuit configured to attenuate said reception signal in said transfer line in response to said second control signal in the case where said antenna terminal is electrically connected to said low noise amplifier circuit by said connection switching circuit, said second attenuation circuit attenuating said branch signal together with said first attenuation circuit in response to said second control signal in the case where said antenna terminal is electrically connected to said power amplifier circuit by said connection switching circuit.