PHOTORECEIVER Russian patent published in 2007 - IPC G01J1/44 

FIELD: semiconductor electro-optics; light radiation sources.

SUBSTANCE: photoreceiver has photodiode, which has one output connected with power source of photodiode and the other one is connected with resistance of load and with input of preamplifier, controlled divider, voltage amplifier, signal detector, integrator and detective comparator provided with reference voltage supply. Controlled divider is connected between output of preamplifier and with input of voltage amplifier. Output of the latter is connected with input of signal detector and with first input of detective comparator. Device also has additional amplifier, noise detector and amplitude signal detector. Preamplifier is made to be controlled. Integrator has two inputs and it is provided with reference voltage supply, which source is connected with its non-inverting input. Non-inverting input of additional amplifier is connected with output of voltage amplifier. Output of additional amplifier is connected with input of noise detector. Inverting inputs of integrator are connected with outputs of noise detector and of signal detector correspondingly. Output of integrator is connected with input of preamplifier. Input of amplitude signal detector is connected with output of voltage amplifier. Output of amplitude detector is connected with control input of controlled divider and with second input of detective comparator. Reference voltage source is connected with its first input.

EFFECT: improved noise immunity when parasitic signals and optical noises are present.

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