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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
Wyświetlanie 1-10 z 20

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