Differential blocking sampler, in particular for an analog...

G - Physics – 11 – C

Patent

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G11C 27/02 (2006.01) H03M 1/12 (2006.01)

Patent

CA 2536220

The invention relates to a blocking sampler, substentially used upstream of a fast analog digital converter. The inventive blocking sampler comprises two main semi-samplers each of which is provided with a respective differential input (E, E') and a respective differential output (S, S'). Each main semi-sampler is connected to a respective auxiliary blocking semi-sampler comprising an auxiliary tracking transistor (T1a, T1a') which is powered by a voltage taken from the terminals of a storage capacitor (C, C') of the other main blocking sampler, an auxiliary storage capacitor (Ca, Ca') connected to the output of the auxiliary tracking transistor and to an auxiliary current switch (T2a, T3a, SC1a; T2'a, T3'a, SC1a') synchronously controlled with the current switch of the main blocking sampler in order to authorise or block a current passage through the auxiliary tracking transistor. The inventive auxiliary samplers are used for improving sampling dynamics when the sampler signal rapidly modifies.

L'invention concerne un échantillonneur bloqueur destiné notamment à être utilisé en amont d'un convertisseur analogique numérique rapide. L'échantillonneur-bloqueur comporte deux demi-échantillonneurs principaux ayant chacun une entrée différentielle respective (E, E') et une sortie différentielle respective (S, S'). A chaque demi-échantillonneur principal est associé un demi -échantillonneur bloqueur auxiliaire respectif comprenant un transistor suiveur auxiliaire (T1a, T1a') alimenté par une tension prélevée aux bornes de la capacité de stockage (C', C) de l'autre échantillon neur-bloqueur principal, une capacité de stockage auxiliaire (Ca, Ca') reliée à la sortie de ce transistor suiveur auxiliaire et un commutateur de courant auxiliaire (T2a, T3a, SC1a ; T2'a, T3'a, SC1a') commandé en synchronisme avec le commutateur de courant de l'échantillon rieur bloqueur principal pour autoriser ou bloquer le passage de courant dans le transistor suiveur auxiliaire. Les échantillonneurs auxiliaires servent à améliorer la dynamique d'échantillonnage dans les cas où le signal à échantillonner varie rapidement.

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