An amplifier arrangement comprising: a first power amplifier having a drain connected to a positive supply voltage and a gate coupled to an input terminal receiving an input signal, a second power amplifier having a drain connected to a negative supply voltage and a gate coupled to said input terminal receiving the input signal, wherein a source of the first power amplifier and a source of the second power amplifier are both connected to a load, a first current sensor arranged to detect a first drain current from said first power amplifier, a second current sensor arranged to detect a second drain current from said second power amplifier, processing circuitry adapted to identify an idle current as a smallest drain current of said first and second drain currents, a bias control loop circuit including: a comparator arranged to compare said idle current value with a pre-set idle current value, to provide an error signal, and a loop gain unit arranged to provide a feedback signal based on said error signal (I e), a first current source connected between the positive supply voltage and the gate of the first power amplifier and adapted to feed a bias current dependent on said feedback signal through a first resistor connected between the input terminal and the gate of the first power amplifier to create a first bias voltage at the gate of said first power amplifier, in order to ensure that the first drain current from said first power amplifier is equal to the pre-set idle current if said first power amplifier is inactive, and a second current source between the negative supply voltage and the gate of the second power amplifier and adapted to feed a bias current dependent on said feedback signal through a second resistor connected between the input terminal and the gate of the second power amplifier to create a second bias voltage at the gate of said second power amplifier in order to ensure that the second drain current from said second power amplifier is equal to the pre-set idle current when said second power amplifier is inactive. a first power amplifier having a drain connected to a positive supply voltage and a gate coupled to an input terminal receiving an input signal, a second power amplifier having a drain connected to a negative supply voltage and a gate coupled to said input terminal receiving the input signal, wherein a source of the first power amplifier and a source of the second power amplifier are both connected to a load, a first current sensor arranged to detect a first drain current from said first power amplifier, a second current sensor arranged to detect a second drain current from said second power amplifier, processing circuitry adapted to identify an idle current as a smallest drain current of said first and second drain currents, a bias control loop circuit including: a comparator arranged to compare said idle current value with a pre-set idle current value, to provide an error signal, and a loop gain unit arranged to provide a feedback signal based on said error signal (I e), a first current source connected between the positive supply voltage and the gate of the first power amplifier and adapted to feed a bias current dependent on said feedback signal through a first resistor connected between the input terminal and the gate of the first power amplifier to create a first bias voltage at the gate of said first power amplifier, in order to ensure that the first drain current from said first power amplifier is equal to the pre-set idle current if said first power amplifier is inactive, and a second current source between the negative supply voltage and the gate of the second power amplifier and adapted to feed a bias current dependent on said feedback signal through a second resistor connected between the input terminal and the gate of the second power amplifier to create a second bias voltage at the gate of said second power amplifier in order to ensure that the second drain current from said second power amplifier is equal to the pre-set idle current when said second power amplifier is inactive. a comparator arranged to compare said idle current value with a pre-set idle current value, to provide an error signal, and a loop gain unit arranged to provide a feedback signal based on said error signal (I e), a first current source connected between the positive supply voltage and the gate of the first power amplifier and adapted to feed a bias current dependent on said feedback signal through a first resistor connected between the input terminal and the gate of the first power amplifier to create a first bias voltage at the gate of said first power amplifier, in order to ensure that the first drain current from said first power amplifier is equal to the pre-set idle current if said first power amplifier is inactive, and a second current source between the negative supply voltage and the gate of the second power amplifier and adapted to feed a bias current dependent on said feedback signal through a second resistor connected between the input terminal and the gate of the second power amplifier to create a second bias voltage at the gate of said second power amplifier in order to ensure that the second drain current from said second power amplifier is equal to the pre-set idle current when said second power amplifier is inactive.