Radio frequency transceiver, method and mobile terminal

The invention discloses a radio frequency transceiver, a method and a mobile terminal and belongs to the radio-frequency transmit-receive technology field. The radio frequency transceiver comprises a receiving unit, a processing unit connected to the receiving unit, a memory cell connected to the processing unit and a power amplifier unit connected to the processing unit, wherein the memory cell stores a plurality of preset emission gains and a corresponding preset adjusting voltage; the processing unit extracts the corresponding adjusting voltage according to the emission gains obtained through calculation and outputs to the power amplifier unit; the power amplifier unit outputs the corresponding emission gains according to the adjusting voltage. The method comprises the following steps of receiving a wireless signal transmitted by an external portion and acquiring a signal intensity; calculating and acquiring the emission gains needed by output; according to the emission gains obtained through calculation, retrieving the corresponding adjusting voltage and outputting; and then outputting the corresponding emission gains. The above technical scheme has the advantages that emission power consumption of the mobile terminal is well controlled; setting is flexible and convenient; usage is convenient and cost is low.