FIELD: communication engineering and data transmission, measuring instruments for discriminating weak signal from noise, spectral analysis of electric signals, etc. SUBSTANCE: amplifier unit has resistor 1 connecting source of periodic signal to be amplified to inverting input of operational amplifier 2 whose noninverting input is connected through resistor 3 to common conductor (ground). Inverting input of operational amplifier 2 is connected through resistor 4 to one of common points of synchronous integrator built up of three parallel-connected circuits of which two are identical and incorporate series-connected capacitor 5 and switch 6 controlled by reference signal, as well as capacitor 7 and switch 8, respectively; third circuit is set up of common resistor 9. Same point of synchronous integrator is connected via circuit set up of series-connected resistor 10 and capacitor 11 to common conductor of unit. Other common point of synchronous integrator is connected to output of operational amplifier 2 which is used as amplifier unit output. Its input is either inverting or noninverting input of operational amplifier 2. EFFECT: simplified design in developing multistage selective amplifiers without reducing signal-to-noise ratio. 2 dwg
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