HIGH FREQUENCY CIRCUIT, HIGH FREQUENCY COMPONENT, AND MULTI-BAND COMMUNICATION APPARATUS

摘要

A high frequency circuit comprises a detector circuit, which includes a switch circuit for selectively connecting antenna terminals to four input/output terminals, as necessary and which has its first reception output connected to a receiving circuit of a first communication system via a filter circuit, its second reception output connected to a receiving circuit of a second communication system via a filter circuit, its first transmission input connected to a transmitting circuit of the first communication system via a power amplifier circuit, and its second transmission input connected to a transmitting circuit of the second communication system via a power amplifier circuit. The detector circuit also includes a bandpass filter circuit on at least one of the paths between the antennas and the transmission inputs or reception outputs, and further includes a detection voltage terminal for monitoring the output powers of the power amplifier circuits.