Patent ID: 7999713

Claim:
An analog-digital converter comprising a network of N differential amplifiers of rank j=1 to N, each having four inputs, two inputs receiving a differential input voltage to be converted V ep −V en , the third and the fourth inputs receiving reference voltages arising from a set of resistors of identical nominal values R traversed by a current of nominal value I 0 , the amplifier of rank j providing a voltage proportional to V ep −V en −K·R·I 0 when the differential input voltage V ep −V en is close to a voltage value K·R·I 0 , wherein the set of resistors comprises a first network of N resistors of value R in series connected on one side to a constant voltage source and on the other to a constant reference current source, the ends of the resistors defining N first taps of rank j=1 to N, and a second network of N resistors of value R in series connected on one side to the said constant voltage source and on the other to another constant reference current source or the constant reference current source such that the two networks are supplied by identical currents, the resistors of the second network defining N second taps of rank j=1 to N, and the amplifier of rank j having its third input linked to a tap of rank j of the first network and its fourth input linked to a tap of rank N−j+1 of the second network, and each of the networks of resistors has a configuration in which each resistor is formed of two resistors in parallel, placed symmetrically with respect to the middle of the network.