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    Wyświetlanie 1-7 z 7
    Tytuł:
    Performance Comparison of QPSK Based Single and Double Stage Digital Interpolators
    Autorzy:
    Ratan, R.
    Sharma, S.
    Kohli, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399677.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Qi
    84.30.Vn
    Opis:
    In this paper, the performance of single stage and double stage digital interpolators has been compared and has been showed that by using multi stage interpolation system the reliability of any communication system increases drastically. Digital signal interpolation systems can be implemented in a variety of ways. The basic interpolator for up-sampling can be a combination of an expander unit with an interpolation low-pass filter in cascade. Complicated implementations can be done by connecting multiple expander and low-pass filter pairs in cascade. This paper presents the efficient implementation of digital interpolation systems for up-sampling of single stage and double stage digital interpolators by using quadrature phase shift keying technique. Comparison is done in terms of spectrum of generated signal, envelope power, modulated signal trajectory, input and output constellation and noise performance.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 196-198
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient Implementation of Multistage Digital Interpolators Using Half Band Filters
    Autorzy:
    Ratan, R.
    Sharma, S.
    Kohli, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399680.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Qi
    84.30.Vn
    Opis:
    The process of increasing the sampling rate of any signal by a factor is known as interpolation. This paper presents the effective and efficient implementation of multistage implementation of digital interpolator using half band filters. The single stage filters are efficient for lower order interpolation factors but for higher rate change which is required in modern digital communication systems like wideband code division multiple access, worldwide interoperability for microwave access single stage implementation does not gives efficient response. For these applications a multistage implementation of the interpolator is preferred. But multistage implementation increases complexity of the overall system. This complexity can be reduced considerably by using half band filters. All this has been done with the help of the Agilent's advanced design software.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 199-201
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultra-low voltage VDCC design by using DTMOS
    Autorzy:
    Başak, M.
    Kaçar, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068583.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Tv
    84.30.Vn
    Opis:
    In this paper, a new ultralow voltage and ultralow power voltage differencing current conveyor based on dynamic threshold voltage MOS transistors was proposed. The simulations were performed by using LTSpice Program with TSMC CMOS 0.18 μ m process parameters. A new notch filter configuration was also presented as an application for the proposed voltage differencing current conveyor. The power consumption of proposed voltage differencing current conveyor was simply 12.42 nW at symmetric ± 0.2 V supply voltage. The simulation results were found in close agreement with the theoretical results.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 223-225
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wide Stopband Microstrip Bandpass Filter Based on a Compact Slotted Ground Structure
    Autorzy:
    Challal, M.
    Dehmas, M.
    Azrar, A.
    Aksas, R.
    Trabelsi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402538.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Vn
    84.40.-x
    Opis:
    A new concept for implementing a bandpass filter by employing a discontinuity in the feed microstrip line in the upper layer and modified dumbbell-shaped slots etched in the ground plane is proposed. The effect of the slot area on the bandpass filter performance is examined. The proposed bandpass filter showed wide stopband and low insertion loss. To further verify the new concept, the structure is implemented and the measurement results are found to be in good agreement with the simulation ones. The proposed structure can be used in various microwave circuits.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-71-B-72
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    "Indoor" Protection of Electronic Systems by Means of High-Pass Negative Feedback
    Autorzy:
    Tamaševičius, A.
    Mykolaitis, G.
    Bumelienė, S.
    Tamaševičiūtė, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807973.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.40.Dc
    84.30.Vn
    89.20.Dd
    Opis:
    An extremely simple first order RC high-pass filter is suggested to suppress harmful radio frequency oscillations, induced by high power electromagnetic pulses. Specifically, a broadband single stage transistor amplifier with a parasitic wiring inductance and also the parasitic junction and mounting capacitances are investigated both numerically and experimentally in the very high and ultrahigh frequency bands.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1164-1166
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Defect Modes in Photonic Band Structure of Magnetic Photonic Crystals by Means of Greens Function
    Autorzy:
    Ansari, N.
    Tehranchi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810554.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    42.70.Qs
    84.30.Vn
    85.70.Sq
    Opis:
    In this paper, we create an analytical model to investigate the localized defect modes associated with a defect cell inserted into a one-dimensional magnetic photonic crystal. The structure is a magnetic superlattice with alternative layers of two different magnetic permeability containing a defect cell which is a layer of different nature (material or/and size) from the other layers. This leads to appearance of several localized defect modes within the magnetic photonic band gap. Our analytical approach is based on the transfer matrix and Green's function methods to calculate the frequency and number of the defect modes which can be controlled easily by varying parameter values of the constituent layers of the magnetic photonic crystal. This method results in an analytical formula for prediction of frequency of the defect modes for both TE and TM polarizations at arbitrary angle of incidence.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 312-314
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Photonic Band Gaps of One-Dimensional Heterostructure Magnetic Photonic Crystals
    Autorzy:
    Ansari, N.
    Tehranchi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810598.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    42.70.Qs
    84.30.Vn
    85.70.Sq
    Opis:
    Multiple structures in one-dimensional photonic crystals have great potentials for ultrawide omnireflectors and tunable switches. In this paper, we study the propagation of electromagnetic waves in a one-dimensional heterostructure magnetic photonic crystal for both TE and TM incidence polarizations by means of the transfer matrix method. Results show that by stacking two magnetic photonic crystals as a heterostructure magnetic photonic crystal the omnidirectional total reflection frequency range for any polarization enlarged due to overlapping of photonic band gaps of both magnetic photonic crystals. Omnidirectional band gaps in the heterostructure magnetic photonic crystal is enhanced rather than that in a single magnetic photonic crystal.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 378-380
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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