| 摘要 |
<p>A method for detecting, through an electronic detection device (1), a threshold crossing instant (TOA) at which an electrical signal (V) crosses a threshold S is described. Such method comprises the steps of: defining, by a clock signal (CL), a sequence of discrete clock instants (Tn) such that two consecutive clock instants of the sequence are time spaced from one another by a clock period (T); then, sampling the electrical signal (V) with a sampling period (T) equal to the clock period (T), at a plurality of sampling instants (Ts) belonging to the sequence of clock instants (Tn); then detecting a first sampling instant (Ts1) and a subsequent consecutive second (Ts2) sampling instant, such that at one of said first (Ts1) and second sampling instant (Ts2) the sampled signal value has a first signal value (V1) lower than or equal to threshold (S), and at the other one of said first (Ts1) and second (Ts2) sampling instant the sampled signal value has a second signal value (V2) higher than threshold (S); moreover, calculating, on the basis of the first signal value (V1), the second signal value (V2) and threshold (S), a first time interval (”t), fractional with respect to the clock period (T), indicative of a temporal distance between the threshold crossing instant (TOA) and the first sampling instant (Ts1); then, setting a reference electrical signal (VR) having a reference amplitude (VR) representative of the first time interval (”t) relative to a reference scale; subsequently, providing the reference signal (VR) as an input signal of a comparison module (500), configured for generating a signal with a controlled delay depending on said input signal; then, generating a threshold crossing detection signal (VTOA) through the comparison module (500), at a threshold crossing detection instant (TTOA) delayed by a second time interval (”t') relative to a reference instant (Tr) belonging to the sequence of clock instants (Tn), said second time interval (”t') depending on the reference amplitude (VR); finally, calibrating the reference scale of the reference amplitude (VR) so that said second time interval (”t') is substantially equal in length to said first time interval (”t).</p> |
