Patent ID: 6954087

Claim:
Sampling device for a high frequency signal (S) that propagates in a propagation structure (L), comprising: a first stage (A 1 , I 1 , C 1 ) to take a first signal sample under the action of a first control signal (K 1 ) at a first time t 1 and at least one second stage (A 2 , I 2 , C 2 ) in series with the first stage to sample a second sample representative of the first sample taken under the action of a second control signal (K 2 ), starting from the first sample taken at a second time t 2 greater than t 1 , the life-time of the second sample in the second stage (A 2 , I 2 , C 2 ) being very significantly longer than the life-time of the first sample in the first stage (A 1 , I 1 , C 1 ), wherein: the first stage (A 1 , I 1 , C 1 ) comprises a first voltage follower amplifier (A 1 ) connected to the propagation structure (L), a first switch (I 1 ) and a first capacitor (C 1 ), the first switch (I 1 ) being controlled by the first control signal (K 1 ) so as to switch from the conducting state to the non-conducting state at the first time t 1 , such that the first capacitor (C 1 ) discharges in a resistance r 1 off at times t>t 1 , the second stage comprises a second voltage follower amplifier (A 2 ), a second switch (I 2 ) and a second capacitor (C 2 ), the second switch (I 2 ) being in the conducting state at first time t 1 such that the capacitor C 2 is charged through resistance r 2 on of the second switch (I 2 ) in the conducting state at times t>t 1 , the second switch (I 2 ) being controlled by the second control signal (K 2 ) so as to switch from the conducting state to the non-conducting state at the second time t 2 , the following condition then being satisfied: r 1 off ×C 1 F ×r 2 on ×C 2 , where F is a multiplication factor very much greater than 1.