FIELD: radio communication engineering. SUBSTANCE: amplifier 201 uses transistors 301,303 such as field-effect MOS transistors in mirror configuration for current. Transistors 301, 303 are easily arranged in surface wiring, Output power of amplifier 201 is controlled by regulating bias current passed through amplifier stage. Proposed amplifier is suitable for use in radio transmitter 109 such as radiophone 103. EFFECT: reduced response to changes in bias current depending on threshold level of control signal. 10 cl, 5 dwg
