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A Proposal for Concurrent Estimation of Static and Dynamic Nonlinearity of ADC

Vora, SC and Satish, L (2009) A Proposal for Concurrent Estimation of Static and Dynamic Nonlinearity of ADC. In: Ieee transactions on power delivery, 24 (2). pp. 524-530.

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Despite great advances in very large scale integrated-circuit design and manufacturing, performance of even the best available high-speed, high-resolution analog-to-digital converter (ADC) is known to deteriorate while acquiring fast-rising, high-frequency, and nonrepetitive waveforms. Waveform digitizers (ADCs) used in high-voltage impulse recordings and measurements are invariably subjected to such waveforms. Errors resulting from a lowered ADC performance can be unacceptably high, especially when higher accuracies have to be achieved (e.g., when part of a reference measuring system). Static and dynamic nonlinearities (estimated independently) are vital indices for evaluating performance and suitability of ADCs to be used in such environments. Typically, the estimation of static nonlinearity involves 10-12 h of time or more (for a 12-b ADC) and the acquisition of millions of samples at high input frequencies for dynamic characterization. ADCs with even higher resolution and faster sampling speeds will soon become available. So, there is a need to reduce testing time for evaluating these parameters. This paper proposes a novel and time-efficient method for the simultaneous estimation of static and dynamic nonlinearity from a single test. This is achieved by conceiving a test signal, comprised of a high-frequency sinusoid (which addresses dynamic assessment) modulated by a low-frequency ramp (relevant to the static part). Details of implementation and results on two digitizers are presented and compared with nonlinearities determined by the existing standardized approaches. Good agreement in results and time savings achievable indicates its suitability.

Item Type: Journal Article
Additional Information: Copyright Of This Article 2009 Belongs To IEEE. Personal Use Of This Material Is Permitted. However, Permission To Reprint/Republish This Material For Advertising Or Promotional Purposes Or For Creating New Collective Works For Resale Or Redistribution To Servers Or Lists, Or To Reuse Any Copyrighted Component Of This Work In Other Works Must Be Obtained From The IEEE.
Keywords: Amplitude modulation; analog-to-digital conversion; analog-to-digital converter (ADC); digitizing waveform recorder; static and dynamic nonlinearity
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: Mr. RP Rajkumar
Date Deposited: 02 Feb 2010 12:13
Last Modified: 19 Sep 2010 05:32
URI: http://eprints.iisc.ac.in/id/eprint/20356

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