Estimation for ADC´s INL Using a Moving-Average Filter

The sine wave code density test is the most prevalent technique to estimate integral nonlinearity (INL) of ADCs. The main disadvantage of this method is that the number of samples tends to increase exponentially with the resolution of ADCs. The moving-average filtered sine wave code density test under coherent sampling condition is proposed in this paper. The proposed method needs fewer samples within the almost same accuracy of INL, and it is especially suitable to the estimation for high-resolution ADCs´ INL. The proposed method is analyzed theoretically and validated by means of simulation and experimental results.