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Abstract

A modulation amplifier includes a signal converter, a summator and a plurality of high frequency stages (3.sub.1-m or 4.sub.1-n). The high frequency stages (3.sub.1-m) are driven by equiphased control signals (s.sub.1-m); the high frequency stages (4.sub.1-n) are driven by control signals (t.sub.1-n) of different phase .PHI..sub.1-n. The high frequency stages (3.sub.1-m or 4.sub.1-n) can be selected in an arbitrary manner by the control signals (s.sub.1-m or t.sub.1-n). The summator adds the high frequency output signals (x.sub.1-m or y.sub.1-n) of the high frequency stages (3.sub.1-m or 4.sub.1-n). The output signal can be conveyed, for example, to a low pass and a subsequent load. The phases (.PHI..sub.1-n) of the output signals (y.sub.1-n) of the high frequency stages (4.sub.1-n) correspond to those of the control signals (t.sub.1-m). So many high frequency stages (3.sub.1-m) are selected that there is at the output of the summator a high frequency oscillation, whose amplitude changes by steps in accordance with the low frequency signal. In addition, so many high frequency stages (4.sub.1-n) with different phases (.PHI..sub.1-n) are selected that the sum of the outputs (y.sub.1-n) corresponds to the difference of the amplified amplitude of the low frequency signal and the coarse approximation of the low frequency signal to the sum of the output signals (x.sub.1-m).

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