Active duplexer circuit

The utility model discloses an active duplexer circuit, which comprises a gain adjustment main circuit, a detection circuit and a control circuit, and is characterized in that the gain adjustment main circuit comprises a gain amplification module and an attenuation module, the gain amplification module is coupled with the attenuation module, the gain amplification module receives an initial radio frequency signal and carries out gain amplification; the attenuation module receives the radio frequency signal amplified by the gain amplification module, attenuates the radio frequency signal and outputs the attenuated radio frequency signal; the detection circuit is coupled with the gain adjustment main circuit and is used for detecting and judging whether the working state of the gain adjustment main circuit is normal or not and outputting a detection result; the control circuit receives the detection result and controls power supply to the gain adjustment main circuit according to the detection result. The detec