Patent ID: 7330070

Claim:
A balanced power amplifier having an in-phase amplifier stage and a quadrature amplifier stage, comprising: a first detector disposed to detect a voltage value of an in-phase signal, the in-phase signal being an output signal of the in-phase amplifier stage, a second detector disposed to detect a voltage value of a quadrature signal, the quadrature signal being an output signal of the quadrature amplifier stage, a controllable supply unit disposed to produce supply voltages for energizing the in-phase amplifier stage and for energizing the quadrature amplifier stage, and a control unit disposed to determine a value of a supply voltage for energizing the in-phase amplifier stage at least partly according to said voltage value of the in-phase signal and to said voltage value of the quadrature signal, and to determine a value of a supply voltage for energizing the quadrature amplifier stage at least partly according to said voltage value of the quadrature signal and to said voltage value of the in-phase signal.