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Tytuł:
Low Power PLL for Communication System
Autorzy:
Tyagi, Mohit
Powiązania:
https://bibliotekanauki.pl/articles/1075551.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
True single phase clock (TSPC)
charge-pump (CP)
low - power
low-jitters
phase frequency detector (PFD)
phase locked loop (PLL)
Opis:
This paper presents the design aspects of low power digital PLL. The performance determining parameters of a digital PLL are lock range, capture range, jitter in generated output signal and power consumption. Its performance is mainly governed by two building blocks namely the voltage controlled oscillator (VCO) and phase detector. We have performed the complete analysis of phase noise and power consumption of current starved VCO, a novel D flip-flop based phase detector and transmission gate based charge pump. We have introduced a charge pump which is giving a remarkable reduction in reference spur. As PLL is used for many applications like as a frequency synthesizer, for clock deskewing, for jitter reduction, in FM radios so everyone demands a low cost low power highly integrated PLL design. Best efforts have been made to design a MOSFET based low power, low cost GHz range digital PLL. The main objective of this paper is to design a low power digital PLL which produces a very stable clock signal having jitter less than 1ps, power consumption less than 805uw ,output frequency ranged from 0 to380MHz at a supply voltage of 1.8V.
Źródło:
World Scientific News; 2019, 121; 26-34
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simplified control strategy for single-phase UPS inverters
Autorzy:
Monfared, M.
Powiązania:
https://bibliotekanauki.pl/articles/201075.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-phase UPS
multi-loop feedback
feedforward
Opis:
Though there are many strategies to control single-phase uninterruptible power supply (UPS) inverters, they suffer from some drawbacks, the main being complexity. This paper proposes a simple dual-loop controller for the single-phase UPS inverter with the LC filter. The suggested control scheme uses the capacitor current as the feedback signal in the inner current loop. No fictitious phase generation or reference frame transformations are required, and simple proportional gains are employed as both voltage and current regulators. A feedforward of the derivative of the output voltage is also proposed, which significantly improves the performance of the closed loop control system. Then, based on the model of the inverter with the proposed control strategy, a simple and systematic design procedure is presented. Finally, the theoretical achievements are supported by extensive simulations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 367-373
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd metod estymacji indywidualnej prędkości pojazdu na podstawie profilu magnetycznego. Nowe kierunki badań
A review of methods for individual vehicle speed estimation based on magnetic signature. New ways of investigations
Autorzy:
Mielczarek, M.
Powiązania:
https://bibliotekanauki.pl/articles/157818.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pętla indukcyjna
estymator
LSE
traffic-1
single loop detector
speed estimation
traffic measurement
Opis:
Dotychczas stosowane metody estymacji prędkości pojazdów przy użyciu pętli indukcyjnych podzielić można na dwie grupy: pierwszą z nich jest estymacja prędkości kolumny pojazdów, drugą zaś estymacja indywidualnej prędkości pojazdu. W pracy porównano pięć znanych metod estymacji indywidualnej prędkości pojazdu. Zaproponowano dwie nowe metody wyznaczania współczynnika SR jako wielkości proporcjonalnej do prędkości pojazdu. Autor zaprezentował również nowe metody estymacji indywidualnej prędkości pojazdu: metodę mediany i najmniejszych kwadratów, oraz metodę mediany i interpolacji liniowej.
Travel time is one of the most important parameter describing traffic. This parameter is closely related to the vehicle speed. Methods of vehicle speed estimation can be divided into two groups: estimation of car volume speed and estimation of individual car speed. In this paper there are compared five known methods. Two areas of investigations are proposed. Two new methods for determining the SR (as a value proportional to the vehicle speed) coefficient are proposed. The first one is modification of the DSL method, in which the least-square method is used to fit a curve in the range of 0.1 to 0.6 of the magnetic profile amplitude. The second, treats the mean value of two edges (leading and trailing) as a value proportional to the vehicle speed. The new method (mean value of two edges) for determining SR was ranked on the third place (RMSE 11.47 %) in a passenger car class. More tests of this method are necessary (for different car classes). Moreover, two new methods for speed estimation are proposed: the median and least square method, and the median and linear interpolation method.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 9, 9; 1031-1034
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid design exploration of low pass highly efficient single loop single bit sigma delta (ΣΔ) modulators
Autorzy:
Krishna, S. Vamsee
Reddy, P. Sudhakara
Reddy, S. Chandra Mohan
Powiązania:
https://bibliotekanauki.pl/articles/38699542.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
sigma delta modulator
single loop
time domain
virtual instrument
biomedical application
modulator sigma delta
pojedyncza pętla
dziedzina czasu
instrument wirtualny
zastosowanie biomedyczne
Opis:
A rapid design and verification of sigma delta modulators are presented at the systemlevel with high accuracy and computational efficiency. Sigma delta analog to digital converters showcased an excellent choice for low bandwidth applications from near DC tohigh bandwidth standard 5G applications. The conceptualization of the graphical userinterface (GUI) in the efficient selection of integrator weights has been proposed, whichsolves various tradeoffs between various abstraction levels. The sigma delta modulator of the 5th order is designed and simulated using the proposed design methodology of calculating integrator weights for targeted specifications. The efficiency of design explorationand optimum selection of integrator coefficients has been investigated on single loop architectures. Power and performance of the selected modulator has been verified in the timedomain behavioral simulation. The discrete time circuit technique has been adopted fordesign of distributed feedback, feed forward architectures and comparison of performancemetrics done between selected architectures. A huge design space is computed for the bestdesign parameters that offers ultra-low power and high performance. The proposed virtual instruments supported the methodology for designing delta sigma modulators at thesystem level achieving SNDR of 122 dB over a bandwidth of 5 kHz at a clock frequencyof 1 MHz.
Źródło:
Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 27-39
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proces uczenia w organizacji (rozważania eksploracyjno-semantyczne)
Autorzy:
Antczak, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/419813.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
learning
learning cycle
single-loop learning
double-loop learning
learning underambiguity
organizational learning
Opis:
The article presents the issue of preliminary results of the research of literature from the point of view of organizational learning. The author diagnosed the scientific scope of such notions as: learning, learning cycle, learning under ambiguity and organizational learning. He also identified and systematized reports from the point of view of knowledge management in an organization. The work is summarized with the qualitative analysis of the research findings.
Źródło:
Nauki o Zarządzaniu; 2013, 2(15); 9-21
2080-6000
Pojawia się w:
Nauki o Zarządzaniu
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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