Composition structure of RF front-end

　　RF front-end can be divided into transmitter (TX) and receiver (RX) according to their functions.

　　According to the components, it can be divided into power amplifier (PA), low-frequency noise amplifier (LNA), filters, switches, duplexes, and antenna tuner

　　a) The power amplifier is responsible for amplifying the RF signal of the transmission channel, ensuring that the signal can reach an effective transmission distance.

　　b) Filters are responsible for filtering the transmitted and received signals, removing unwanted frequency bands and spurious signals, and improving signal quality.

　　c) The low-noise amplifier is responsible for amplifying small signals in the receiving channel, ensuring the reliability and sensitivity of the signal.

　　d) RF switches are responsible for switching between receiving and transmitting channels, ensuring the correct transmission path of signals.

　　e) The duplexer is responsible for quasi duplex switching, while filtering the RF signals of the receiving and transmitting channels to avoid mutual interference.

　　f) The tuner is responsible for channel selection, frequency variation, and amplification of RF signals to meet different communication needs.

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