Stalchenko O. Analog-digital high frequency signals conversion paths with non-linearity correction

Object of research - the processes of processing high-frequency signals in an analog-digital paths of computer systems; the aim of the thesis is to expand the dynamic range of the analog-to-digital paths of computer systems for processing high-frequency signals by correcting the nonlinearity of conversion characteristic paths; methods used theory of analog-to-digital conversion and signal theory, the theory of stochastic processes; theory of errors and the theory of digital signal processing; heuristic synthesis; The theoretical results the first time proposed a method of digital linearity correction analog-to-digital path of RF signals, which uses histogram differential nonlinearity estimation with further processing in the basis of frequency-ordered Walsh functions; The mathematical model of a nonlinear ADT RF signals, which, through the use of the basis functions of the discrete Fourier transform, takes into account the impact of each level quantization linearity path; obtain new analytical expressions for the evaluation of the dynamic range of the ADT correction, which take into account the nonlinearity of conversion characteristic parameters of input signals and the accuracy of the formation of the amendments; Improved methods of analog-to-digital conversion of RF signals by adding an narrow-band noise-like signall. Practical results - engineering design methodology for constructing the ADT conversion of high-frequency signals, which made it possible to create a computer system for digital processing RF signals with a wide dynamic range; develop a framework of basic parallel type ADC; develop a framework for the digital to analog generator test signals ADT based on the principle of piecewise linear approximation; to develop the structure of the ADT conversion RF signals, which uses a digital method of correcting non-linearity of the ADT, and develop a flowchart of calibration CP ADT, while the wide dynamic range achieved tract; develop structure ADT converting RF signals based on a modified method of analog-to-digital conversion of RF signals by adding an additional noise-like signal, which is characterized by a wide dynamic range; synthesizing algorithm mutual spectral Walsh-Fourier transformations, avoiding the implementation of FFT algorithm for the initial signal ADT; create an operating model samples ADT convert RF signals using basic LSI ADC firms Venta and Analog Devices. The degree of implementation - results and best practices implemented in APM "Mayak" in Vinnitsa center of maintenance and operation of LLC "Atracom", as well as in the educational process in Vinnytsia National Technical University at the Department of Telecommunication Systems and Television. scope (industry) of application - information-measuring system of fast processes, computer systems RF signals as part of radio systems and telecommunications networks.