A power amplifier arrangement comprising: a power amplifier comprising at least one transistor having a first gate and a back gate, wherein the first gate is configured to receive a radio frequency input signal superimposed with a first control signal, and the back gate is configured to receive a second control signal; and wherein the first control signal is a linearization signal varying in relation to an envelope of the input signal and the second control signal is a temperature compensation signal varying in relation to a temperature of the power amplifier; and the power amplifier further comprises: a bias circuit comprising a constant transconductance circuit, wherein the constant transconductance circuit comprises a current mirror, a first transistor and a second transistor, wherein each of the first transistor and the second transistor has a first gate, a back gate, a drain and a source, and wherein the first gates (vgate) of the first and second transistors are connected to a first terminal having a first voltage, the source of the first transistor is connected to a second terminal, the source of the second transistor is connected to the second terminal via a resistive circuit element, the drains of the first and second transistors are coupled to the current mirror such that the current drawn from the current mirror by the second transistor is mirrored and output to the first transistor, the back gate of the first transistor is connected to its drain and further connected to the back gate of the second transistor, and the temperature compensation signal (Out) is provided from the back gates of the first and second transistors (T1, T2). a power amplifier comprising at least one transistor having a first gate and a back gate, wherein the first gate is configured to receive a radio frequency input signal superimposed with a first control signal, and the back gate is configured to receive a second control signal; and wherein the first control signal is a linearization signal varying in relation to an envelope of the input signal and the second control signal is a temperature compensation signal varying in relation to a temperature of the power amplifier; and the power amplifier further comprises: a bias circuit comprising a constant transconductance circuit, wherein the constant transconductance circuit comprises a current mirror, a first transistor and a second transistor, wherein each of the first transistor and the second transistor has a first gate, a back gate, a drain and a source, and wherein the first gates (vgate) of the first and second transistors are connected to a first terminal having a first voltage, the source of the first transistor is connected to a second terminal, the source of the second transistor is connected to the second terminal via a resistive circuit element, the drains of the first and second transistors are coupled to the current mirror such that the current drawn from the current mirror by the second transistor is mirrored and output to the first transistor, the back gate of the first transistor is connected to its drain and further connected to the back gate of the second transistor, and the temperature compensation signal (Out) is provided from the back gates of the first and second transistors (T1, T2).