FIELD: low-power and multistage amplifiers for communication and other devices. SUBSTANCE: variable- gain amplifier 100 has input stage 120 and one or more current amplifier stages 160A and 160B series-connected past stage 120 so that gain of each stage 120 can be independently varied. Input stage 120 can be formed by variable-transconductance amplifier using adjustable negative emitter feedback. Current amplifier (stages 160A, 160B) can be formed by Darlington differential amplifier connected to differential stage amplifier. Variable-gain amplifier affords exponential growth of voltage gain as function of linear increments of regulating voltage being applied thereby ensuring approximately linear growth of power in decibels proportional to linear increments of regulating voltage applied. EFFECT: enhanced dynamic range and operating efficiency of variable-gain amplifier. 18 cl, 9 dwg
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