POST-CORRECTION OF ADC NON-LINEARITY USING INTEGRAL NON-LINEATITY CURVE

Authors

  • Vladimir Haasz
  • David Slepicka
  • Petr Suchanek

DOI:

https://doi.org/10.47839/ijc.12.1.588

Keywords:

Analog-to-digital converter, ADC non-linearity, INL, transfer function, approximation, non-linearity correction, simulations, experimental verification.

Abstract

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.

References

IEEE 1241-2000 Standard for Analog to Digital Converters, The Institute of Electrical and Electronics Engineers, 2001.

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V. Haasz, M. Komarek, J. Roztocil, D. Slepicka, P. Suchanek, System for Testing Middle-Resolution Digitizers Using Test Signal up to 20 MHz, IMTC/06 Proceedings of the 23th IEEE Instrumentation and Measurement Technology Conference.

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P. Suchanek, V. Haasz, D. Slepicka, ADC Nonlinearity Correction Based on INL(n) Approximations. IEEE International Workshop IDAACS 2009. Rende, Italy 2009, pp. 137–140.

P. Suchanek, V. Haasz, D. Slepicka, Evaluation of ADC Non-linearity Correction Based on INL(n) Approximation, BEC 2012 – 13th Biennial Baltic Electronics Conference [CD-ROM]. Tallinn, Estonia 2012, pp. 101-104.

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Published

2014-08-01

How to Cite

Haasz, V., Slepicka, D., & Suchanek, P. (2014). POST-CORRECTION OF ADC NON-LINEARITY USING INTEGRAL NON-LINEATITY CURVE. International Journal of Computing, 12(1), 56-62. https://doi.org/10.47839/ijc.12.1.588

Issue

2013, Volume 12, Issue 1

Section

Articles

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