the circuit includes a first transistor (1) is described, the current electrodes) that are coupled between a first line and a first reference voltage node, and the gate electrode is coupled to a first node of the gate which, in use,an input voltage so that the transistor operates in the region of the triad, a second transistor (2) whose current electrodes are coupled between the first node and an output node.the last line is coupled to a second reference voltage, a comparator (3) for comparing a first voltage at the level of the first node with a second voltage level of a second node at entry and command the second transistor gate electrode, so that to maintain the first and second voltages substantially equal.the current passing through the second transistor is proportional to the product of the first and second voltages at input nodes.
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