Abstract: Power amplifier for amplifying an electric input signal in an operational frequency range and providing an output signal, comprising switching means (12) for generating a block wave signal by alternately switching the block wave signal to a first supply voltage or a second supply voltage, input means for receiving the electric signal and driving the switching means, wherein the input means comprises an integrator circuit (10) integrating an error signal formed by a difference between the output signal and the electric input signal and providing an integrator gain in the operational frequency range, the power amplifier further comprising a local feedback circuit (18), and a global feedback circuit (20), an output of the integrator circuit being connected the input of the switching mean A limiter circuit (22) is connected to receive the electric input signal and an output signal of the integrator circuit and connected to the integrator circuit for limiting the gain of the integrator circuit when detecting a dif

Abstract: A power amplifier for amplifying an electric input signal in an operational frequency range and providing an output signal, comprising switching means (22), filter means (14, 15) for generating a power output signal by low pass filtering a block wave signal, input means for receiving the electric signal and feeding it to a first input of the switching means, the power amplifier further comprising a feedback circuit (24) connecting the output signal to the first input of the switching means. The power amplifier comprises a servo amplifier (32) connected to receive an error signal appearing at the first input of the switching means and to feed a correction output signal to a second input of the switching means (22) for neutralizing an impact of the error signal on the output signal. The invention relates to a method of amplifying an electric input signal in an operational frequency range.

Abstract: Power amplifier for amplifying an electric input signal in an operational frequency range and providing an output signal, comprising switching means (12) for generating a block wave signal by alternately switching the block wave signal to a first supply voltage or a second supply voltage, input means for receiving the electric signal and driving the switching means, wherein the input means comprises an integrator circuit (10) integrating an error signal formed by a difference between the output signal and the electric input signal and providing an integrator gain in the operational frequency range, the power amplifier further comprising a local feedback circuit (18), and a global feedback circuit (20), an output of the integrator circuit being connected the input of the switching mean A limiter circuit (22) is connected to receive the electric input signal and an output signal of the integrator circuit and connected to the integrator circuit for limiting the gain of the integrator circuit when detecting a dif