Method for detecting, through an electronic detection device, a threshold crossing instant at which an electrical signal crosses a threshold, comprising: - defining by a clock signal a sequence of discrete clock instants (Tn), such that two consecutive clock instants of said sequence are spaced in time from one another by a clock period; - sampling the electrical signal with a sampling period equal to the clock period, at a plurality of sampling instants (Ts) belonging to said sequence of clock instants (Tn); - detecting a first sampling instant and a subsequent consecutive second sampling instant, such that in one of said first and second sampling instants the sampled signal value has a first signal value lower than, or equal to, the threshold, and in the other one of said first and second sampling instants the sampled signal value has a second signal value higher than the threshold; - calculating, on the basis of said first signal value, second signal value and threshold, a first time interval (At), indicative of a temporal distance between the threshold crossing instant and the first sampling instant; - setting a reference electrical signal having a reference amplitude representative of the first time interval (At) relative to a reference scale; - providing the reference electrical signal to the input of a comparison module comprised in the electronic detection device; - generating, by the comparison module, a threshold crossing detection signal (VTOA) at a threshold crossing detection instant (TTOA) delayed by a second time interval (Δt') relative to a reference instant (Tr) belonging to the clock instant sequence (Tn), said second time interval (Δt') depending on the reference amplitude; - calibrating the reference scale of the reference amplitude in such a way that said second time interval (Δt') is substantially equal in length to said first time interval (Δt). - defining by a clock signal a sequence of discrete clock instants (Tn), such that two consecutive clock instants of said sequence are spaced in time from one another by a clock period; - sampling the electrical signal with a sampling period equal to the clock period, at a plurality of sampling instants (Ts) belonging to said sequence of clock instants (Tn); - detecting a first sampling instant and a subsequent consecutive second sampling instant, such that in one of said first and second sampling instants the sampled signal value has a first signal value lower than, or equal to, the threshold, and in the other one of said first and second sampling instants the sampled signal value has a second signal value higher than the threshold; - calculating, on the basis of said first signal value, second signal value and threshold, a first time interval (At), indicative of a temporal distance between the threshold crossing instant and the first sampling instant; - setting a reference electrical signal having a reference amplitude representative of the first time interval (At) relative to a reference scale; - providing the reference electrical signal to the input of a comparison module comprised in the electronic detection device; - generating, by the comparison module, a threshold crossing detection signal (VTOA) at a threshold crossing detection instant (TTOA) delayed by a second time interval (Δt') relative to a reference instant (Tr) belonging to the clock instant sequence (Tn), said second time interval (Δt') depending on the reference amplitude; - calibrating the reference scale of the reference amplitude in such a way that said second time interval (Δt') is substantially equal in length to said first time interval (Δt).