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    Wyświetlanie 1-20 z 20
    Tytuł:
    Highlighting Problems Occurring in Analysis of Critical Sampling of Cosinusoidal Signal
    Autorzy:
    Borys, A.
    Korohoda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841594.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    cosinusoidal signal
    signal processing
    signal spectrum
    critical samplinga
    analog signal
    Opis:
    When the sampling of an analog signal uses the sampling rate equal to exactly twice the value of a maximal frequency occurring in the signal spectrum, it is called a critical one. As known from the literature, this kind of sampling can be ambiguous in the sense that the reconstructed signal from the samples obtained by criti-cal sampling is not unique. For example, such is the case of sampling of a cosinusoidal signal of any phase. In this paper, we explain in very detail the reasons of this behavior. Furthermore, it is also shown here that manipulating values of the coefficients of the transfer function of an ideal rectangular reconstruction filter at the transition edges from its zero to non-zero values, and vice versa, does not eliminate the ambiguity mentioned above.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 729-736
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analog Reconfirable Circuits
    Autorzy:
    Malcher, A.
    Falkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/226956.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analog signal processing
    configurable analog block
    CAB
    dynamic reconfiguration
    field programmable analog array
    FPAA
    switched capacitor circuits
    Opis:
    The aim of this paper is to present an overview of a new branch of analog electronics represented by analog reconfigurable circuits. The reconfiguration of analog circuits has been known and used since the beginnings of electronics, but the universal reconfigurable circuits called Field Programmable Analog Arrays (FPAA) have been developed over the last two decades. This paper presents the classification of analog circuit reconfiguration, examples of FPAA solutions obtained as academic projects and commercially available ones, as well as some application examples of the dynamic reconfiguration of FPAA.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 1; 15-26
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metal detector excited by frequency-swept signal
    Autorzy:
    Svatoš, J.
    Vedral, J.
    Fexa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221024.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal detection
    polyharmonic signals
    Frequency Sweep
    modelling of electromagnetic induction
    analog signal processing
    Opis:
    This paper describes the theoretical background of electromagnetic induction from metal objects modelling. The response function of a specific case of object shape - a homogenous sphere from ferromagnetic and nonferromagnetic material is introduced. Experimental data measured by a metal detector excited with a linearly frequency-swept signal are presented. As a testing target various spheres from different materials and sizes were used. These results should lead to better identification of the buried object.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 1; 57-67
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyfrowy obraz rzeczywistości analogowej – ćwiczenie laboratoryjne z informatyki użytkowej
    Digital Image of Analog Reality – Laboratory Practice in Computer Science
    Autorzy:
    WIJATA, Agata M.
    MITAS, Andrzej W.
    BIEŃKOWSKA, Maria J.
    Powiązania:
    https://bibliotekanauki.pl/articles/456156.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    sygnał analogowy
    sygnał cyfrowy
    próbkowanie
    A/C
    karta dźwiękowa
    analog signal,
    digital signal,
    sampling,
    A/D,
    sound card
    Opis:
    Zagadnienie cyfrowej jakości dźwięku i obrazu jest związane przede wszystkim z parametrami przetwarzania analogowo-cyfrowego wymagającego czytelnej ekspozycji. W artykule zaprezentowano opis ćwiczenia laboratoryjnego możliwego do wykonania w praktyce szkoły ponadpodstawowej, mającego na celu ocenę wpływu częstotliwości próbkowania na jakość dźwięku.
    The issue of digital sound and picture quality is associated primarily with the parameters of the analog conversion, which requires clear exposure. The article presents a description of laboratory exercises that can be performed practically in secondary school. Aim of the exercise is the evaluation of the impact of the sampling frequency for audio quality.
    Źródło:
    Edukacja-Technika-Informatyka; 2015, 6, 3; 147-152
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power-saving voltage-to-current conversion with the use of CMOS differential amplifier
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/398104.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog signal processing
    differential amplifier
    CMOS electronics
    low-power analog circuits
    analogowe przetwarzanie sygnałów
    wzmacniacz różnicowy
    CMOS
    obwody niskiego napięcia
    Opis:
    Differential amplifiers are well known as input stage preamplifiers. This is because they exhibit the ability to reduce unwanted common-mode effects considerably. As a consequence, both noise and input signal of the amplifier can have low values. Proper operation of differential amplifiers is possible when implemented in chip form. For typical use of such CMOS amplifiers, input signals are delivered to differential-pair gate-terminals while tail terminal is used to ensure the required bias of the pair. The paper shows that the roles of gates and tail terminal can be changed. In other words, the tail current can be used as input signal while the gate ones as voltages controlling the amplifier gain. This enables to combine the achievable low noise with power efficient operation of the circuit. Necessary conditions for that are discussed in this paper. Suitability of atypically used differential amplifiers for voltage-to-current conversion is explained. Two examples of CMOS circuits implementing power economic conversion of this type are presented.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2015, 6, 3; 96-101
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upgraded low voltage analog Current-to-Voltage converter with negative feedback
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/397781.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog signal processing
    current-to-voltage converters
    feedback theory
    analog CMOS electronics
    analogowe przetwarzanie sygnałów
    przetworniki prądowo-napięciowe
    teoria sprzężenia zwrotnego
    CMOS
    Opis:
    In this paper, an improved version of a current to voltage (C-V) converter is proposed. As compared to the previous version, the number of used transistors has been reduced by 1 and equals 7. The main results of this change are: an improvement of the circuit transfer function linearity, reduction the converter input resistance and decrease of the required supply voltage. Improvements in the considered converter results not only from the reduction of the number of the used transistors but also from the proposed realization of the feedback loop. In this way, it was possibly to get a strong loop gain. As a results, the achieved minimum supply voltage has been reduces from 2V, in case of the previous published converter version, to as low level as 1.2 V, in the case of the newly proposed solution. As for the linearity of the C-V transfer function, apart from its strong loop gain, an important role play also output transistors operating in a small drain to source region (linear region). Working in this region, one obtains a quasi linear voltage to current relationship. The theoretical and simulation results are in a good agreement and are promising.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2017, 8, 2; 80-84
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical synthesis of parameter-varying filter of constant component with application to switching systems
    Autorzy:
    Piskorowski, J.
    Kaszyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/221736.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    data acquisition
    analog signal processing
    transient behavior
    dynamics
    switching systems
    linear parameter-varying technique (LPV)
    linear time-varying systems (LTV)
    Opis:
    In this paper, we propose a concept of a continuous-time filter of constant component that exhibits a very short response in the time domain if compared to the traditional time-invariant filter. The improvement of the filter dynamics was achieved as a result of the time-varying parameters which were introduced to the filter structure. Such a designed filter is then applied in a system which switches many distorted signals which should be filtered as fast as possible. The paper is of review nature and presents both a theoretical background of the proposed filter and the results of simulations.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 3; 471-480
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wavelet energy-based mahalanobis distance metric for testing analog and mixed-signal circuits
    Autorzy:
    Spyronasios, A. D.
    Dimopoulos, M. G.
    Hatzopoulos, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/398112.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analogowy i mieszany test sygnału
    test obwodu
    falki
    odległość Mahalanobisa
    Analog and Mixed-Signal Testing
    Circuit Test
    wavelets
    Mahalanobis distance
    Opis:
    In this paper a test method based on the wavelet transformation of the measured signal, be it supply current (Ips) or output voltage (Vout) waveform, is presented. In the wavelet analysis, a Mahalanobis distance test metric is introduced utilizing information from the wavelet energies of the first decomposition level of the measured signal. The tolerance limit for the good circuit is set by statistical processing data obtained from the fault-free circuit. Simulation comparative results on benchmark circuits for testing both hard faults and parametric faults are presented showing the effectiveness of the proposed testing scheme.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 2; 218-224
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Input signal conditioning circuits for precision SAR analog to digital converters
    Autorzy:
    Barwinek, W.
    Kampik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/114260.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    SAR analog to digital converter
    signal conditioning
    amplifier
    Opis:
    The paper presents a review of the known signal conditioning circuits that may be used as a front-end of precision high-resolution successive-approximation register (SAR) analog to digital converters (ADC). The review was created while searching for the optimal signal conditioning circuit to be used with a high-resolution SAR ADC applied in a precise sampler for voltage, power, energy and impedance metrology applications.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 4; 129-131
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast Determination of Similarity Between Two Vectors by Means of Analog CMOS Technique
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/226703.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hardware signal processing
    fast Euclidean distance calculation
    analog CMOS circuits
    Opis:
    In this paper, an analog approach to determining a resemblance between two multidimensional vectors is proposed. As the resemblance measure, Euclidean distance is used. The main advantage of the presented method is a very high speed of the Euclidean-distance-measure calculations. The achieved high speed results from the fact that most of arithmetic operations needed to realize the calculations are carried out in parallel. This concerns the required operations of squaring a difference of two corresponding components of the compared vectors. Operating in a transconductane mode (voltage difference squaring transconductors) and a current mode (output square-root extracting circuit), our CMOS circuit is power saving. Its low-power operation results from the fact that sub-circuits of our calculator responsible for the squaring operations (a great number of them in case of large multidimensional vectors) consume no power in the absence of input signals. This takes place when corresponding components of the compared vectors are both equal to zero. The circuit also consumes a reasonably low amount of energy when processing (comparing) a different from zero input data (corresponding vector components). A simplified description of the applied differential squaring transconductors as well as the output current-mode square-root extraction circuit is given and a problem of good cooperation between them is discussed and proper solutions indicated. SPICE simulation results are shown to be in a good agreement with the theory presented.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 4; 417-422
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the FPAA to Sample Input Signal for Laboratory Exercise: Pulse Amplitude Modulation
    Autorzy:
    Grzechca, Damian
    Chruszczyk, Lukas
    Powiązania:
    https://bibliotekanauki.pl/articles/227335.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    field programmable analog array (FPAA)
    signal processing
    pulse amplitude modulation (PAM)
    student laboratory
    Opis:
    This paper presents exemplary exercise on the fundamentals of signal processing course which is offered for second year bachelor level students. Application of Field Programmable Analog Array (FPAA) for pulse amplitude modulation (PAM) exercise is described with signal processing laboratory. There are presented two methods for implementing PAM modulation and demodulation technique in FPAA module. Example configuration files are available form Authors’ web site.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 25-28
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DAC testing using modulated signals
    Autorzy:
    Fexa, P.
    Verdal, J.
    Svatoš, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220431.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital-to-analog converter
    ENOB
    Signal-to-noise and distortion - SINAD
    FFT analysis
    Crest Factor (CF)
    Opis:
    This document analyses qualities of methods used for testing dynamical parameters of Digital-to-Analog Converters (DAC) using a multi-frequency signal. As the source for these signals, Amplitude Modulated (AM) and Frequency Modulated (FM) signals are used. These signals are often used in radio engineering. Results of the tests, like Effective Number of Bits (ENOB), Signal-to-Noise and Distortion (SINAD), are evaluated in the frequency domain and they are compared with standard results of Sine Wave FFT test methods. The aim of this research is firstly to test whether it is possible to test a DAC using modulated signals, secondly to reduce testing time, while estimating band performance of DAC.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 283-293
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oszacowanie stosunku sygnału do szumu w asynchronicznych przetwornikach analogowo-cyfrowych
    Signal-to-Noise Ratio for asynchronous analog-to-digital converters
    Autorzy:
    Jabłeka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/156639.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    przetworniki analogowo-cyfrowe
    stosunek sygnału do szumu
    próbkowanie
    kwantyzacja
    analog-to-digital converters
    signal-to-noise ratio
    sampling
    quantization
    Opis:
    W artykule przedstawiono porównanie współczynnika stosunku sygnału do szumu (SNR) dla synchronicznych oraz asynchronicznych przetworników analogowo-cyfrowych. Badania wykonano dla trzech modeli stochastycznych sygnałów wejściowych o rozkładach Gaussa, równomiernym oraz sygnału sinusoidalnego. Oszacowano spadek wartości współczynnika SNR dla asynchronicznego przetwornika analogowo-cyfrowego typu Sigma-Delta w porównaniu z klasycznym przetwornikiem synchronicznym, wywołany odpowiednio nieliniowością bloku próbkującego (-10dB) oraz niejednoznacznością procesu kwantyzacji (-3dB).
    This paper shows the difference between the SNR level for classical synchronous analog-to-digital converters (ADC) and asynchronous Sigma-Delta analog-to-digital converters (ASD ADC) (Fig. 2) [4, 5]. Simulative evaluation shows that the conversion quality for ASD ADCs is about 2 bit worse than for classical synchronous ADCs (Tabs. 1 and 2). The reason for such a difference is firstly the nonlinearity of an ASD ADC sampling block (ASDM) (-10dB in SNR value) and secondly the quantization noise whose variance value is two times bigger than in case of classical ADCs ( 3dB in SNR). Such big quantization noise is caused by the need of measuring the time position of two independent pulse edges with uniform probability density function (pdf) for the quantization error [8]. The difference for these two measurements yields a triangular distribution which overlaps consecutive quantization intervals (Fig. 1b) and is the source of uncertainty of the digital word at the ASD ADC output [8]. Simulations were performed for four configurations of sampling and quantization blocks, the classical ADC and three other sets of linear/nonlinear sampling blocks and certain/uncertain quantization blocks. Such simulation methodology shows the influence of properties of each element of the signal path in the ASD-ADC on the quantization noise pdf (Fig. 3). The SNR is evaluated for three stochastic models of input signals: Gauss, uniform and sinusoidal signal. Comparison requires assuming the proper amplitude and frequency domain, because of balance between the dynamic range and bandwidth of the ASD ADC.
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 1, 1; 30-32
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic solutions for a program system for dynamic systems simulation
    Autorzy:
    Timofeev, A. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/92971.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
    Tematy:
    dynamic system simulation
    creating interactive applications
    Amethyst program system
    calculating the component state
    decentralized processing the signal delays
    filtering
    analog objects simulating
    Opis:
    The article presents basic solutions of the Amethyst program system. The system generates interactive applications for simulating complex dynamic systems. The method of presenting the information about the state of the simulated objects and method of calculating the component state are proposed. Method of decentralized processing the signal delays and filtering is discussed. Method of analog objects simulating is proposed. The article presents examples of projects produced for C++ Builder, Visual C++ and Visual Basic 2005 environment projects. The executable times of simulation are compared for the above mentioned environment applications.
    Źródło:
    Studia Informatica : systems and information technology; 2006, 1(7); 255-263
    1731-2264
    Pojawia się w:
    Studia Informatica : systems and information technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Versatile low-output-resistance low-voltage current-to-voltage analog converter
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/397867.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    CMOS analog integrated circuits
    low-voltage signal processing
    current to voltage conversion
    transresistor
    układy analogowe CMOS
    układy scalone CMOS
    przetwarzanie sygnałów
    konwersja prąd na napięcie
    transrezystor
    Opis:
    The paper presents a simple low-voltage transresistor attractive for on-chip analog-signal-processing. The proposed circuit offers not only an almost rail-to-rail operation and quite good linearity of DC transfer characteristic but also reasonably low value of its output resistance. This enables a voltage mode operation even if the transresistor is loaded by a not necessarily very high loading resistance. The obtained result is due to adding to the transresistor-input-stage a simple rail-to-rail voltage follower. The presented solution is an original proposal of the author. Input stage of the transresistor is built of only 4 MOS transistors and creates a simple quasi-linear current-to-voltage convertor. Output stage of it is built of 9 MOS transistors, plays a role of a very precise atypical voltage follower. In respect of simplicity and headroom, the proposed follower is better than conventional OA-based voltage followers. Preliminary simulation results are in a good agreement with the theory presented.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2016, 7, 2; 73-78
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective Filtering in Signal Multiplexing Systems
    Efektywna filtracja w systemach multipleksowania sygnałów
    Autorzy:
    Piskorowski, J.
    Kaszyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/157015.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    przetwarzanie sygnałów
    akwizycja danych
    multiplekser analogowy
    układy o zmiennych parametrach
    filtr składowej stałej
    signal processing
    data aquisition
    analog multiplexer
    time-varying systems
    filter of constant component
    Opis:
    Artykuł przedstawia nową koncepcję filtru składowej stałej o zmiennych parametrach, który charakteryzuje się bardzo krótką odpowiedzią w dziedzinie czasu, nie wykazując przy tym istotnych zaburzeń filtrowanych sygnałów w dziedzinie częstotliwości. Zaprojektowany filtr wykorzystano w procesie multipleksowania silnie zaszumionych sygnałów, co pozwoliło na zaprezentowanie zalet zaproponowanego układu. W celu przedstawienia korzyści z wprowadzenia do struktury filtru zmiennych w czasie parametrów porównano jego właściwości z klasycznym układem o stałych współczynnikach.
    In this article, we propose a novel concept of a continuous-time time-varying filter of constant component that exhibits a very short response in the time domain without significant distortions in the frequency domain. Such a designed filter is then applied in the system containing analog multiplexer, where it is able to reveal its advantageous properties. Results verifying the effectiveness of the proposed approach are presented and compared to the traditional filters.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 6, 6; 42-45
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calibration of a mixed-signal power network transient stability analysis emulator
    Autorzy:
    Lanz, G
    Fabre, L.
    Lilis, G
    Kyriakidis, T
    Sallin, D
    Cherkaoui, R.
    Kayal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/398094.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog computer
    calibration
    field programmable gate array (FPGA)
    FPGA
    mixed signal
    power system dynamics
    komputer analogowy
    kalibracja
    field-programmable gate array
    sygnał mieszany
    dynamika systemu elektroenergetycznego
    Opis:
    The emerging field of power system emulation for real time smart grid management is very demanding in terms of speed and accuracy. This paper provides detailed information about the electronics calibration process of a high-speed power network emulator dedicated to the transient stability analysis of power systems. This emulator uses mixed-signal hardware to model the dynamic behavior of a power network. Special design allows the self-calibration of the analog electronics through successive measurements and correction steps. The calibration operation guarantees high resolution of the transient stability analysis results, so that they can be reliably used for operational planning and control on real power networks.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2013, 4, 4; 142-147
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quick-response protection system against electric shock in distributed generation systems
    Autorzy:
    Shkrabets, Fedir
    Plaksin, Sergej
    Ostapchuk, Oleksandr
    Kuznetsov, Valeriy
    Tymchenko, Irina
    Muntian, Antonina
    Powiązania:
    https://bibliotekanauki.pl/articles/1840853.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    electric networks
    protection
    reliability
    ground fault current
    electrical safety
    protection against electric shock
    signal processing system
    analog filtering
    sieci elektryczne
    ochrona
    niezawodność
    bezpieczeństwo elektryczne
    ochrona przeciwporażeniowa
    system przetwarzania sygnału
    filtracja analogowa
    Opis:
    The peculiarities of the operation of distributed generation systems lead to a change in the requirements for the reliability and safety of the power distribution systems in which they are integrated. To meet the increased requirements, continuous monitoring of the insulation parameters (active resistance and capacitance to ground) is often used with operating artificial non-industrial frequency operational signals introduced into the network. In the case of a sudden touch, such a system is not effective, since the response time of the protection device, which consists of the signal processing time and the operating of the actuator, is crucially important. For the used operational signals with a frequency of 100 and 200 Hz, the processing time using the Fourier transform is 10 ms for 100 Hz and 5 ms for 200 Hz. Considering that the response time of the fastest actuators (based on vacuum switches) is from 3 to 7 ms, this is a rather significant period of time. To develop an effective resolver system, the capabilities of the Matlab environment were used to determine the most successful design of an analog prototype (Butterworth, Bessel, Chebyshev and Cauer of 6th order) for an operational signal with a frequency of 200 Hz. As a result, the processing time was established, which varies widely from 3.5 to 19 ms. Taking into account the known indicators, namely the frequency and number of operational signals, a signal processing system was developed using the vector-matrix analysis method. As a result of modeling the processing characteristics of functional signals (at a sampling rate of 1 kHz), the system quick-response was 3 ms, with the possibility of its further decrease as its productiveness increases.
    Źródło:
    Diagnostyka; 2021, 22, 3; 59-65
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quick-response protection system against electric shock in distributed generation systems
    Autorzy:
    Shkrabets, Fedir
    Plaksin, Sergej
    Ostapchuk, Oleksandr
    Kuznetsov, Valeriy
    Tymchenko, Irina
    Muntian, Antonina
    Powiązania:
    https://bibliotekanauki.pl/articles/1840876.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    electric networks
    protection
    reliability
    ground fault current
    electrical safety
    protection against electric shock
    signal processing system
    analog filtering
    sieci elektryczne
    ochrona
    niezawodność
    bezpieczeństwo elektryczne
    ochrona przeciwporażeniowa
    system przetwarzania sygnału
    filtracja analogowa
    Opis:
    The peculiarities of the operation of distributed generation systems lead to a change in the requirements for the reliability and safety of the power distribution systems in which they are integrated. To meet the increased requirements, continuous monitoring of the insulation parameters (active resistance and capacitance to ground) is often used with operating artificial non-industrial frequency operational signals introduced into the network. In the case of a sudden touch, such a system is not effective, since the response time of the protection device, which consists of the signal processing time and the operating of the actuator, is crucially important. For the used operational signals with a frequency of 100 and 200 Hz, the processing time using the Fourier transform is 10 ms for 100 Hz and 5 ms for 200 Hz. Considering that the response time of the fastest actuators (based on vacuum switches) is from 3 to 7 ms, this is a rather significant period of time. To develop an effective resolver system, the capabilities of the Matlab environment were used to determine the most successful design of an analog prototype (Butterworth, Bessel, Chebyshev and Cauer of 6th order) for an operational signal with a frequency of 200 Hz. As a result, the processing time was established, which varies widely from 3.5 to 19 ms. Taking into account the known indicators, namely the frequency and number of operational signals, a signal processing system was developed using the vector-matrix analysis method. As a result of modeling the processing characteristics of functional signals (at a sampling rate of 1 kHz), the system quick-response was 3 ms, with the possibility of its further decrease as its productiveness increases.
    Źródło:
    Diagnostyka; 2021, 22, 3; 59-65
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sampling Jitter in Audio A/D Converters
    Autorzy:
    Kulka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/177046.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analog-to-digital converter
    ADC
    successive approximation register (SAR)
    sigma-delta ADC
    sample-and-hold circuit
    DT sigma delta modulator
    CT sigma delta modulator
    time jitter
    aperture jitter
    clock jitter
    periodic clock jitter
    signal-to-noise ratio (SNR)
    Opis:
    This paper provides an overview of the effects of timing jitter in audio sampling analog-to-digital converters (ADCs), i.e. PCM (conventional or Nyquist sampling) ADCs and sigma-delta (ΣΔ) ADCs. Jitter in a digital audio is often defined as short- term fluctuations of the sampling instants of a digital signal from their ideal positions in time. The influence of the jitter increases particularly with the improvements in both resolution and sampling rate of today’s audio ADCs. At higher frequencies of the input signals the sampling jitter becomes a dominant factor in limiting the ADCs performance in terms of signal-to-noise ratio (SNR) and dynamic range (DR).
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 831-849
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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