1. A method for generating an adjustable bandgap reference voltage, comprising: generating a current proportional to absolute temperature, comprising equalizing the voltage across terminals of a core, the core configured to then be traversed by said current proportional to absolute temperature, generating a current inversely proportional to absolute temperature, summing said current proportional to absolute temperature and said current inversely proportional to absolute temperature; and generating said bandgap reference voltage on the basis of the said sum of currents, wherein said equalizing comprises connecting across the terminals of the core a first fed-back amplifier possessing at least one first stage arranged as a folded setup and comprising first PMOS transistors arranged according to a common-gate setup, and biasing said first stage on the basis of said current inversely proportional to absolute temperature, and wherein said summing is performed in the feedback stage of the first amplifier.