one sensor and one acquisition channel each preamplifier amp 1 comprises one inverter inv 1 a polarization device pol such as has been described in the preceding and is illustrated in fig3 comprising a voltage regulator reg a reference inverter inv a current source ipol in this first embodiment voltage regulator reg and reference inverter inv_ref are powered between a first voltage v dd and a second voltage v ss the voltage applied to preamplifiers amp due to the polarization device is v ddinv as explained previously it should be noted in that in this first embodiment polarization device pol is connected to preamplifiers amp i in parallel based on the calculations explained previously that enable a conventional preamplifier to be compared with an inverter based amplifier assembly with regulator in a following a generalization is made of the assembly of n inverters inv i associated with a single polarization device pol retaining the same power allocated per channel p 0 in the expressions that follow the notation g m i means that the transconductance g m of a transistor is a function of the polarization current i that flows through it the dissipated power is p0 corresponding to a polarization current i0 this is represented by p 0 i 0 u00b7 v dd u2212 v ss the noise spectral density referred to input is equal to for the n preamplifiers amp i based on inverters inv i with polarization device pol the dissipated power is np 0 np 0 u2032 d reg with p 0 u2032 i 0 u2032 u00b7 v dd u2212 v ss i 0 u2032 being the polarization current that passes through a.