FIELD: amplified signal generation in response to input signal. SUBSTANCE: amplifier circuit arrangement 40 has input circuit 44 for feeding input signal to at least one amplifier stage chosen out of set of amplifier stages. Output circuit 48 is used for branching off amplified signal from at least one amplifier stage. Desired amplifier stage is chosen by means of control circuit 56 according to desired power level of amplified signal by selective invocation of only that or those amplifier stage (stages) required to ensure desired output power level. Proposed device is most suited for use in systems where linear operation of amplifier within comprehensive dynamic range is required. EFFECT: enhanced dc efficiency. 12 cl, 12 dwg
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