Sampling methods and devices, more particularly for analog-digital conversions

Claim 1

In an analog-digital converting device comprising an amplifier having input means, a memory capacitor having a first and second plate, and a comparator having input means, all being associated with connection means and switching means to permit functioning in successive first and second periods controlled by the working of said switching means, said first period being a sampling period during which an input analog voltage is applied to said amplifier which charges said capacitor, and said second period being a comparing period for comparing the previously sampled voltage during which said comparator compares the capacitor voltage with a reference voltage; the improvement wherein said switching means comprise a plurality of distinct switching elements, said elements being constructed and arranged to be connected to the input of the amplifier and to the input of the comparator respectively and to be concomitantly actuated, and the connection means and the switching means being constructed and arranged whereby the output of said amplifier is connected to a first plate of said capacitor, and the second plate of said capacitor is connected to said input means of said comparator and also, through a switching element closed only during said first period, to the earth, whereby the analog input voltage and the reference voltage are alternatively applied, namely the former voltage during the first period and the latter during the second period, to the input of said amplifier through respective switching elements.