Patent ID: 8819609

Claim:
A method of making an electronic microcircuit, comprising: forming a processing circuit configured to execute successive process phases, the forming including: forming in a substrate an isolated well electrically isolated from an underlying portion of the substrate; and forming a power supply terminal and a ground terminal of the processing circuit, wherein at least one of the power supply and ground terminals is formed in the isolated well; and forming a power supply circuit configured to, at or near each of the successive process phases, dynamically readjust a power supply voltage between the power supply and ground terminals of the processing circuit as a function of a randomly varying signal, wherein forming the power supply circuit includes forming the power supply circuit configured to adjust the power supply voltage between the power supply and ground terminals of the processing circuit in a determined range as a function of: variations of the power supply voltage resulting from variations of performances of the processing circuit linked to variations of an ambient temperature and variations of manufacturing conditions of the microcircuit, variations of the power supply voltage and ground voltages of the microcircuit as a function of an extent of activity of the microcircuit, and minimum voltages allowing a switching of N-channel and P-channel transistors of the microcircuit to be performed.