APPARATUS FOR RECEIVING, AMPLIFYING AND PRELIMINARY PROCESSING SIGNALS OF OPTICAL DATA CHANNELS IN THE INFRARED RANGE Russian patent published in 2020 - IPC H04B10/69 G01J11/00 

FIELD: optical instrument making.

SUBSTANCE: invention relates to optical instrument-making and concerns a device for receiving, amplifying and preprocessing signals of optical data channels in the infrared range. Device comprises an infrared photodiode connected in a photodiode mode, a signal processing unit, a switch and a stereo audio amplifier. Signal processing unit comprises an operational amplifier (OA) with a resistor in a negative feedback circuit, three capacitors and seven resistors, two signal processing channels connected to OA output consisting of in-series connected high-pass filters (HPF) and low-pass filters (LPF). One channel performs amplitude demodulation of the signal and comprises an amplitude demodulator connected between HPF and LPF. Outputs of the signal processing channels are outputs of the signal processing unit and are connected to inputs of the switch, the output of which is connected to the first input of the stereo audio amplifier.

EFFECT: technical result consists in widening the range of wavelengths of infrared signals, high selectivity of signals of different frequencies, enabling detection of amplitude-simulated signals and high speed of operation of the device.

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