Abstract: This analog electronic circuit (2) for processing a light signal (4), of the type comprising: a photodetector (6) adapted for producing an electric signal (8) from the light signal (4); a multiplier (12) adapted for multiplying the electric signal (8) with a reference signal (14) for obtaining a multiplied signal (16); and an integrator (18) adapted for integrating the multiplied signal (16) over at least one time interval, in order to obtain one integrated signal, is characterized in that it further comprises: an analog memory (24) adapted for storing the integrated signal in memory; and a computing unit adapted for estimating a time correlation of the light signal (4) from the integrated signal stored in memory.