Open AccessPOST-CORRECTION OF ADC NON-LINEARITY USING INTEGRAL NON-LINEATITY CURVE
Author(s) -
V. Haasz,
David Slepička,
Petr Suchánek
Publication year - 2014
Publication title -
computing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.184
H-Index - 11
eISSN - 2312-5381
pISSN - 1727-6209
DOI - 10.47839/ijc.12.1.588
Subject(s) - linearity , inverse , mathematics , histogram , curve fitting , function (biology) , algorithm , transfer function , mathematical analysis , computer science , statistics , electronic engineering , artificial intelligence , geometry , image (mathematics) , electrical engineering , evolutionary biology , engineering , biology
The accuracy of AD conversion can be improved usin g the post-correction of digitizer non-linearity. In principle two methods could be applied – look-up table or an analytical inverse function of integral non-linearity curve (INL(n)). Look-up table can be easily implemented but it demands huge memory space particularly for high resolution ADCs. Inverse function offers flexible solution for parameterization (e.g. frequency dependence) but it also requires fast DSP for real-time correction. The data or coefficients for bot h methods are frequently determined from a histogram of acquired pure sinusoidal signal. Non-linearity curve can also be gained by another procedure demanding significantly less samples – approximation from a frequency spectrum. The correction of ADC nonlinearity by means of inverse function of INL(n) curve is analyzed in this paper and the results are presented.