The Experts below are selected from a list of 132507 Experts worldwide ranked by ideXlab platform
S. Mori - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Digital Frequency synthesizer and its analysis
IEEE International Symposium on Circuits and Systems, 1Co-Authors: H. Hikawa, S. Mori, V.k. JainAbstract:A Digital Frequency synthesizer which uses a phase accumulator as a reference generator is described. An auxiliary phase detector is proposed to remove the low-Frequency components which degrade the purity of the output signal in conventional Frequency synthesizers. The high reference Frequency, which offers a high loop gain and the enhanced characteristics of the phase-Frequency detector lead to significantly improved Frequency switching. A complete analysis of this Digital Frequency synthesizer is presented. >
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A Digital Frequency synthesizer with a phase accumulator
1988. IEEE International Symposium on Circuits and Systems, 1Co-Authors: H. Hikawa, S. MoriAbstract:Describes a Digital Frequency synthesizer that uses a novel phase-estimation technique in which a phase accumulator is used as a reference generator and the phase error is treated as a numerical value. The performance of the proposed system is verified by both experiments and theoretical analysis. It is shown that the proposed system has faster Frequency switching speed and better synchronous mode than the conventional PLL system because of the characteristics of the phase-Frequency detector and the high-Frequency reference. >
J. Vankka - One of the best experts on this subject based on the ideXlab platform.
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Digital Frequency synthesizer/modulator for continuous-phase modulations with slow Frequency hopping
IEEE Transactions on Vehicular Technology, 1997Co-Authors: J. VankkaAbstract:This paper gives a description of a modulator for burst-by-burst carrier Frequency hopping in time-division multiple-access (TDMA) systems. The architecture consists of a Digital Frequency synthesizer/modulator for continuous-phase modulations (CPMs) and a fast Frequency settling RF synthesizer consisting of one phase-locked loop (PLL). The performance of the Digital Frequency synthesizer/CPM modulator has been analyzed theoretically and simulated by a computer program. The analyses show that the proposed Digital Frequency synthesizer/CPM modulator achieves 2.5-W lower power consumption and 18-dB lower spurious levels than the fast Frequency hopping systems synthesizing Digitally a full Frequency band. In the computer simulations the effect of the Digital Frequency synthesizer/CPM modulator parameters on the power spectrum and the phase error is investigated.
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PIMRC - Digital Frequency synthesizer/modulator for continuous phase modulations with slow Frequency hopping
Proceedings of PIMRC '96 - 7th International Symposium on Personal Indoor and Mobile Communications, 1Co-Authors: J. VankkaAbstract:This paper gives a description of a modulator for burst-by-burst carrier Frequency hopping in TDMA systems. The architecture consists of a Digital Frequency synthesizer/modulator for a broad class of continuous phase modulations (CPMs) and a fast Frequency settling RF synthesizer consisting of one phase-locked-loop (PLL). The performance of the Digital Frequency synthesizer/CPM modulator has been analyzed theoretically and simulated by a computer program. The analyses show that the proposed Digital Frequency synthesizer/CPM modulator achieves lower power consumption and spurious levels than the fast Frequency hopping systems synthesizing Digitally a full Frequency band. In the computer simulations the effect of the Digital Frequency synthesizer/CPM modulator parameters on the power spectrum and the phase error is investigated.
H. Hikawa - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Digital Frequency synthesizer and its analysis
IEEE International Symposium on Circuits and Systems, 1Co-Authors: H. Hikawa, S. Mori, V.k. JainAbstract:A Digital Frequency synthesizer which uses a phase accumulator as a reference generator is described. An auxiliary phase detector is proposed to remove the low-Frequency components which degrade the purity of the output signal in conventional Frequency synthesizers. The high reference Frequency, which offers a high loop gain and the enhanced characteristics of the phase-Frequency detector lead to significantly improved Frequency switching. A complete analysis of this Digital Frequency synthesizer is presented. >
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A Digital Frequency synthesizer with a phase accumulator
1988. IEEE International Symposium on Circuits and Systems, 1Co-Authors: H. Hikawa, S. MoriAbstract:Describes a Digital Frequency synthesizer that uses a novel phase-estimation technique in which a phase accumulator is used as a reference generator and the phase error is treated as a numerical value. The performance of the proposed system is verified by both experiments and theoretical analysis. It is shown that the proposed system has faster Frequency switching speed and better synchronous mode than the conventional PLL system because of the characteristics of the phase-Frequency detector and the high-Frequency reference. >
V.k. Jain - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Digital Frequency synthesizer and its analysis
IEEE International Symposium on Circuits and Systems, 1Co-Authors: H. Hikawa, S. Mori, V.k. JainAbstract:A Digital Frequency synthesizer which uses a phase accumulator as a reference generator is described. An auxiliary phase detector is proposed to remove the low-Frequency components which degrade the purity of the output signal in conventional Frequency synthesizers. The high reference Frequency, which offers a high loop gain and the enhanced characteristics of the phase-Frequency detector lead to significantly improved Frequency switching. A complete analysis of this Digital Frequency synthesizer is presented. >
L. Karpova - One of the best experts on this subject based on the ideXlab platform.
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Phase Accumulator Simulation for Advanced Digital Frequency Synthesizers
2019 3rd International Conference on Advanced Information and Communications Technologies (AICT), 2019Co-Authors: O. I. Polikarovskykh, I. V. Gula, L. KarpovaAbstract:The principles of constructing direct Digital Frequency synthesizers with the use of the apparatus of modular arithmetic are considered. The object of research is the mathematical model and structure of specialized structural units of direct Digital Frequency synthesizers on the basis of modular arithmetic. The conducted experiments showed that the method of realization of arithmetic operations in modular arithmetic is based on the minimization of Boolean functions by modern heuristic methods. Experiments were conducted to prove the effectiveness of the proposed approach for modules in the range of 5-6 bits. Also, on the example of the area minimization algorithm, it was shown that optimization opportunities are not exhausted, and research on this topic is expedient to continue.
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Principles of construction of structural units for direct Digital Frequency synthesizer
2018 14th International Conference on Advanced Trends in Radioelecrtronics Telecommunications and Computer Engineering (TCSET), 2018Co-Authors: O. Polikarovskih, L. Kovtun, L. KarpovaAbstract:Principles of construction of the direct Digital Frequency synthesizer with phase core-based adder in the Galois basis was discussed. The mathematical model and the structure of specialized structural units of direct Digital Frequency synthesizers based on modular arithmetic was discussed.
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New Phase Accumulator for Direct Digital Frequency Synthesizer
2018 International Scientific-Practical Conference Problems of Infocommunications. Science and Technology (PIC S&T), 2018Co-Authors: O. I. Polikarovskykh, L. Kovtun, L. Karpova, I. V. GulaAbstract:Principles of construction of the direct Digital Frequency synthesizers were proposed. The proposed structure of the phase synthesizer accumulators based on Galois adders that will increase the bit range of syntheses and improve their Frequency response range expansion in the direct Digital synthesizers of signals. The functional circuit devices were proposed.
