FIELD: communication equipment.
SUBSTANCE: invention relates to amplifier circuits. Disclosed is amplifier (30) for receiver circuit (15). Amplifier has an input node (Vin) and an output node (Vout). It comprises adjustable oscillatory circuit (100) connected to output unit (Vout), circuit (200) of feedback circuit, connected between output unit (Vout) and input unit (Vin), and adjustable capacitor (210), connected between internal node of feedback circuit (200) and reference voltage unit. Receiver circuit and the communication device are also disclosed.
EFFECT: technical result consists in providing wideband matching of input impedance with achieving sufficiently high efficiency during amplification with frequency selectivity.
12 cl, 10 dwg
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