Circuit for analyzing a signal reflected from an object

A circuit arrangement for analyzing a clocked optical signal (3a′, 3a) reflected from an object (3′, 3), comprising at least one radiation emitter (1′, 1) which, for providing the clocked signal (1a′, 1a) is connected to a clocking signal generator (4′, 4), at least one radiation receiver (2′, 2) which receives radiation pulses (1a′, 1a) emitted by the radiation emitter (1′, 1) and reflected from the object (3′, 3), a controllable amplifier (6′, 6) having an input (6E′, 6E) connected to the clocking signal generator (4′, 4) and an output (6A′ 6A) connected to a controllable power source (9) for controlling the strength of the output signal provided by the radiation receiver (2′, 2), the circuit arrangement further comprising a comparator (5′, 5, 12, 13, 14, 15) by means of which output signal pulses (2a′, 2a) of the radiation receiver (2′, 2) are compared with reference signal pulses (6a′, 6a) of the controllable amplifier (6′, 6), wherein the amplitudes of the reference signal pulses (6a′, 6a) depend on output signals (5a′, 5a) of the comparator (5′, 5, 12, 13, 14, 15), the reference signal pulses (6a′, 6a) being generated internally and occurring concurrently with the radiation optical signal (3a′, 3a) received by the radiation receiver (2′, 2) and the output signal pulses (2a′, 2a) of the radiation receiver (2′, 2) are compensated for each by the respective internal reference signal pulses (6a′, 6a) before their analysis in the circuit arrangement.