A circuit comprising: at least one memory cell adapted to store data corresponding to predetermined threshold voltage values, wherein said threshold voltage values are affected by a variability with temperature according to a first variation law and a voltage generator adapted to generate an operating voltage (Vo) to be supplied to the at least one memory cell for retrieving the data stored therein, the voltage generator including first means adapted to cause the generated operating voltageto take a value in a set of target values including at least one target value (Vr-1, Vr-2, Vr-3,Vfy-1,Vfy-2,Vfy-3), depending on an operation to be performed on the memory cell, the voltage generator further comprising second means (Mt,Rs,325,R1,R2,330) for causing the value taken by the generated operating voltage to vary with temperature according to a prescribed second variation law, said second means including a compensation circuit element (Mt) having said electrical characteristic that is exploited to cause the variation of the value taken by the generated operating voltage wherein the compensation circuit element includes a MOS-type variable-conductivity transistor element (Mt) having a threshold voltage exhibiting a variability with temperature corresponding to that of the threshold voltage of a MOS-type transistor forming the memory cell, said variable-conductivity element having a gate terminal receiving a control voltage from said first means, and a current-delivery terminal for delivering a current having a value depending on the control voltage and the threshold voltage thereof, said first means include a voltage regulator (310,Mr,R10-R16) adapted to generate a regulated voltage (Vreg) taking a value in said set of target values, said regulated voltage being stable against temperature variations; and said second means include: compensation voltage generator means (Mt,Rs,325) adapted to generate a compensation voltage (Vs') varying with temperature according to said second variation law, said compensation voltage generator means including said compensation circuit element; and voltage combining means (R,R2,330) receiving the regulated voltage and the compensation voltage and adapted to combine the regulated voltage and the compensation voltage so as to obtain the operating voltage; said second variation law is such that the variation of the compensation voltage with temperature is proportional to the variation with temperature of the threshold voltage of the MOS-type variable-conductivity transistor and said voltage combining means are adapted to combine the regulated voltage with the compensation voltage in such a way that the variation of the operating voltage with temperature is proportional to the variation with temperature of the threshold voltage of the MOS-type transistor; the compensation voltage generator means further including a current/voltage converter (Rs, 325) coupled to the current-delivery terminal for converting the delivered current into said compensation voltage. compensation voltage generator means (Mt,Rs,325) adapted to generate a compensation voltage (Vs') varying with temperature according to said second variation law, said compensation voltage generator means including said compensation circuit element; and voltage combining means (R,R2,330) receiving the regulated voltage and the compensation voltage and adapted to combine the regulated voltage and the compensation voltage so as to obtain the operating voltage; said second variation law is such that the variation of the compensation voltage with temperature is proportional to the variation with temperature of the threshold voltage of the MOS-type variable-conductivity transistor and said voltage combining means are adapted to combine the regulated voltage with the compensation voltage in such a way that the variation of the operating voltage with temperature is proportional to the variation with temperature of the threshold voltage of the MOS-type transistor; the compensation voltage generator means further including a current/voltage converter (Rs, 325) coupled to the current-delivery terminal for converting the delivered current into said compensation voltage.