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Indian Institute of Science

1. Chandravadan, Vora Santoshkumar. Novel Methods For Estimation Of Static Nonlinearity Of High-Speed High-Resolution Waveform Digitizers.

Degree: 2009, Indian Institute of Science

Analog-to-digital converter (ADC) is the main workhorse in a digital waveform recorder. Strictly speaking, an ADC is supposed to perform uniformly, irrespective of the characteristics of the signal to be acquired. However, because of certain hardware related inconsistencies, its performance declines, particularly, when acquiring non-repetitive, fast-rising, high frequency signals. The error and distortion contributed due to its declining performance, for the entire range of signals, can be comprehensively characterized by the static and dynamic nonlinearities. Actual testing of ADCs is the only way of estimating these indices. These characteristics reveal information at the microscopic level, such as bit-level aberrations, code transitions, response and settling trends, etc. These tests attain greater significance, when the digitizer is part of a reference measuring or a calibration system, because, the levels of accuracies to be achieved in such a setup may become comparable to the error introduced by the ADC. Hence, testing ADCs is a priority. International and national standards exist for testing digital waveform recorders and ADCs. For several years, the matter related to reducing static test time of high-resolution ADCs was highlighted through many publications. A critical examination of the literature indicates the major schools-of-thought pursued so far, are, (i) refinements to ramp/triangular signal based static testing, (ii) proposals for use of alternative methods and/or test signals for static test, (iii) innovative ways of achieving a relaxation in signal source requirements and, (iv) efforts to combine static and dynamic test into a single test with an appropriate test signal. As a consequence of the literature review, objectives of the thesis were formulated. They attempt to resolve- (i) Conceive a suitable test signal for simultaneous estimation of static and dynamic nonlinearity through a single test (ii) Explore possibility of employing a low-linearity ramp signal to estimate static nonlinearity (iii) Estimating static nonlinearity by exploiting linearity property of a sine signal • In the first part of the thesis, a method is proposed for the concurrent estimation of static and dynamic nonlinearity characteristics of an ADC, with the application of a single test signal. The novelty arises from the fact that the test signal proposed is new, and so is the concept of extracting the static and dynamic nonlinearity from the ADC output. This was achieved by conceiving a test signal, comprising of a high frequency sinusoid (which addresses the dynamic requirement), modulated by a low frequency ramp (which addresses the static requirement). • Static characteristics of an ADC can be determined directly from the histogram-based quasi-static approach by measuring the ADC output, when excited by an ideal ramp/triangular signal of sufficiently low frequency. This approach requires only a fraction of time compared to the conventional DC test, is straightforward, easy to implement, and, in principle is an… Advisors/Committee Members: Satish, L.

Subjects/Keywords: Analog-to-Digital Waveforms; Electric Converters; Analog-to-Digital Converters (ADC); Digital Electronics; Waveform Digitizers; Analog-to-Digital Converters - Nonlinearity; Static Nonlinearity; Dynamic Nonlinearity; Low Linearity Ramp; Electrical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chandravadan, V. S. (2009). Novel Methods For Estimation Of Static Nonlinearity Of High-Speed High-Resolution Waveform Digitizers. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1019

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Chandravadan, Vora Santoshkumar. “Novel Methods For Estimation Of Static Nonlinearity Of High-Speed High-Resolution Waveform Digitizers.” 2009. Thesis, Indian Institute of Science. Accessed October 16, 2019. http://hdl.handle.net/2005/1019.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Chandravadan, Vora Santoshkumar. “Novel Methods For Estimation Of Static Nonlinearity Of High-Speed High-Resolution Waveform Digitizers.” 2009. Web. 16 Oct 2019.

Vancouver:

Chandravadan VS. Novel Methods For Estimation Of Static Nonlinearity Of High-Speed High-Resolution Waveform Digitizers. [Internet] [Thesis]. Indian Institute of Science; 2009. [cited 2019 Oct 16]. Available from: http://hdl.handle.net/2005/1019.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chandravadan VS. Novel Methods For Estimation Of Static Nonlinearity Of High-Speed High-Resolution Waveform Digitizers. [Thesis]. Indian Institute of Science; 2009. Available from: http://hdl.handle.net/2005/1019

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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