Siemens Aktiengesellschaft

Guenther Herbster

Friedrich Schumacher

A control system for the linearization of an amplifier circuit having a power amplifier operating in the non-linear region for the amplification of an RF input signal. In a modulator a local oscillator is derived from a coupled-out input measurement signal. In a mixer, the local oscillator signal is mixed with the input and output measurement signal to form a respective intermediate-frequency signal. In a detector, level signals are derived from the intermediate-frequency signal and are compared in an amplitude controller. A derived amplitude control signal controls an amplitude controlling element for the linearization of the amplification of the input signal.

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Munich, Germany

Guenther Herbster