A radio frequency, RF, switching circuit for coupling an antenna to a RF circuit, the RF switching circuit having a first mode of operation and a second mode of operation and comprising: a switch arranged to switchably couple a RF signal input to a RF signal output , the switch comprising a first transistor (10, M1, M2a) having a first terminal, a second terminal, and a control terminal; a bias swapping circuit having a bias voltage output coupled to the first terminal and the second terminal; wherein the bias swapping circuit is operable to switch the bias voltage output between a first bias voltage value and a second bias voltage value in response to a change in the mode of operation of the RF switching circuit; a mode controller coupled to the bias swapping circuit and the control terminal and operable to switch the RF switching circuit between the first mode of operation and the second mode of operation; characterized in the RF switching circuit further comprising: an RF signal power detector coupled to the bias swapping circuit and at least one of the RF signal input and the RF signal output , and wherein the bias swapping circuit is further operable to vary the voltage on the bias voltage output in response to a change in the detected RF signal power; a power supply detector coupled to the bias swapping circuit , wherein the bias swapping circuit is further operable to vary the voltage on the bias voltage output in response to a change in the detected power supply voltage and/or current; and a temperature sensor coupled to the bias swapping circuit , wherein the bias swapping circuit is further operable to vary the voltage on the bias voltage output in response to a change in the detected temperature. a switch arranged to switchably couple a RF signal input to a RF signal output , the switch comprising a first transistor (10, M1, M2a) having a first terminal, a second terminal, and a control terminal; a bias swapping circuit having a bias voltage output coupled to the first terminal and the second terminal; wherein the bias swapping circuit is operable to switch the bias voltage output between a first bias voltage value and a second bias voltage value in response to a change in the mode of operation of the RF switching circuit; a mode controller coupled to the bias swapping circuit and the control terminal and operable to switch the RF switching circuit between the first mode of operation and the second mode of operation; characterized in the RF switching circuit further comprising: an RF signal power detector coupled to the bias swapping circuit and at least one of the RF signal input and the RF signal output , and wherein the bias swapping circuit is further operable to vary the voltage on the bias voltage output in response to a change in the detected RF signal power; a power supply detector coupled to the bias swapping circuit , wherein the bias swapping circuit is further operable to vary the voltage on the bias voltage output in response to a change in the detected power supply voltage and/or current; and a temperature sensor coupled to the bias swapping circuit , wherein the bias swapping circuit is further operable to vary the voltage on the bias voltage output in response to a change in the detected temperature. <EOS>