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Information × Registration Number 0219U101772, 0117U003888 , R & D reports Title Designing of a high-speed synthesizer for digital radio communication systems popup.stage_title Head Polikarovskykh Oleksii I., Доктор технічних наук Registration Date 31-10-2019 Organization Khmelnytskyi National University popup.description2 The object of study is the processes of digital synthesis of radio signals with predetermined characteristics and frequency synthesizers with phase accumulators in non-positioned numerical systems. The subject of the study is digital computing phase-frequency methods and means of synthesis of radio signals with specified characteristics. The subject of development is a digital direct frequency synthesis synthesizer with a working range up to 100 MHz. The purpose of the work is to increase the frequency range, accuracy and speed of signal frequency synthesis by applying non-positioned numerical systems and using the obtained results to construct direct digital frequency and signal synthesizers for digital radio systems. As a result of the conducted research: generalization and systematization of the available theoretical and experimental results of the study to improve the accuracy and broadening of the frequency range, as well as to enhance the functionality of direct digital frequency synthesizers; analysis of methods of construction of high-speed digital computing synthesizers of multilevel signals is carried out; possible application of new mathematical approaches for the construction of phase accumulators of direct digital frequency synthesizers is analyzed without the problem of delay of propagation of the transfer signals from the discharge to the discharge of the code word frequency. A generalized mathematical model of a computing frequency synthesizer is constructed; an approach is proposed for the construction of digital signal processing systems based on mathematical field theory, and narrower to digital frequency and signal synthesis systems based on a residual class system; sources of noise of direct digital frequency synthesizers and methods of reducing their periodic component are considered; structural elements of direct digital frequency synthesizers have been developed; developed functional models of single-crystal high-speed frequency synthesizers  Product Description popup.authors Gula Igor V. Karpova Lesya V. Melnychuk Vasyl M. Polikarovskykh Oleksii I. popup.nrat_date 2020-04-02 Close