Effect and compensation of ADC nonlinearity on magnetic accommodation measurements

In this paper we analyze how static errors of Analog-to-Digital converters (ADCs) can influence the measurement of magnetic accommodation in soft ferrite core. In a first analysis, the discussion is carried out through a series of simulated ADC INLs applied to simulated signals and experimental data. Possible impacts of the integral nonlinearity (INL) on the reconstruction of the B H trajectory are shown. In a second phase, a real ADC INL is considered to better quantify the impact of real ADC errors on the measurements. An easy to implement procedure based on physical symmetry property of the material is presented and adopted to reduce the INL effect on magnetic accommodation measurements. Finally, a comparison between the proposed approach and a mid-point linearization compensation technique of INL is reported showing the validity of the presented procedure.