Abstract: The invention relates to a method and apparatus for shaping an input signal Son which is input to a multi-stage amplifier arrangement, to provide a definable output signal contour Soff. Individual amplifier stages are controlled by a control signal generated by a pulsed current source of a definable pulse length T. According to the invention, successive amplifier stages are each controlled (switched on) after a definable delay time ?ton 1, ?ton 2 following the preceding stage. Each amplifier stage has an assigned pulsed current source for generating the control signals of definable pulse length T. One such pulse generator respectively is assigned to each current source.

Abstract: A procedure for operation of a high frequency amplifier having a power transistor—amplifier stage designed as a source or emitter circuit for amplifying a gate or base side high frequency signal supplied over an input interface network E which signal is amplified at the drain or collector side and output via an output interface network. A device for the measurement of the drain or collector current I_D is connected at the amplifier stage on the drain or collector side and a final control element is connected on the gate or base side. A pre-adjustable desired value W_SOLL and an actual value W_IST corresponding to the drain or collector current are input to the final control element, which adjusts the gate voltage or the base current so that the drain or collector current I_D is brought to the desired value W_SOLL. At a constant input power P_IN of the high frequency amplifier, the envelope curve of the output signal RF_OUT is modulated by the desired value W_SOLL.

Abstract: A procedure for operation of a high frequency amplifier having a power transistor—amplifier stage designed as a source or emitter circuit for amplifying a gate or base side high frequency signal supplied over an input interface network E which signal is amplified at the drain or collector side and output via an output interface network. A device for the measurement of the drain or collector current I_D is connected at the amplifier stage on the drain or collector side and a final control element is connected on the gate or base side. A pre-adjustable desired value W_SOLL and an actual value W_IST corresponding to the drain or collector current are input to the final control element, which adjusts the gate voltage or the base current so that the drain or collector current I_D is brought to the desired value W_SOLL. At a constant input power P_IN of the high frequency amplifier, the envelope curve of the output signal RF_OUT is modulated by the desired value W_SOLL.

Abstract: The invention relates to a method and apparatus for shaping an input signal Son which is input to a multi-stage amplifier arrangement, to provide a definable output signal contour Soff. Individual amplifier stages are controlled by a control signal generated by a pulsed current source of a definable pulse length T. According to the invention, successive amplifier stages are each controlled (switched on) after a definable delay time ?ton 1, ?ton 2 following the preceding stage. Each amplifier stage has an assigned pulsed current source for generating the control signals of definable pulse length T. One such pulse generator respectively is assigned to each current source.