Now showing items 35-54 of 104

  • Electronically Adjustable Emulator of the Fractional-Order Capacitor 

    Dvořák, Jan; Kubánek, David; Herencsár, Norbert; Kartci, Aslihan; Bertsias, Panagiotis (Kaunas University of Technology, 2019-12-12)
    This paper presents a design of the controllable emulator of the FOC (Fractional-Order Capacitor) and its application. The circuit is based on 5th-order RC topology (type Foster I) where the passive elements in the topology ...
  • Electronically adjustable mixed-mode implementations of the jerk functions 

    Petržela, Jiří; Šotner, Roman; Slezák, Josef (Hikari Ltd., 2009-06-22)
    In this paper the several structures of the third-order nonlinear oscillator with electronically adjustable parameters are presented. A brief numerical analysis including the computation of the largest Lyapunov exponent ...
  • Electronically Reconfigurable Universal Filter Based on VDTAs 

    Langhammer, Lukáš; Šotner, Roman; Domanský, Ondřej; Hricko, Tomáš (IEEE, 2018-04-19)
    The proposed filter extends features of the previously presented Voltage Differencing Transconductance Amplifiers (VDTAs)-based frequency filter. It brings the new advantage of an electronic reconfiguration of its transfer. ...
  • Electronically Tunable Oscillator Utilizing Reinforced Controllable Parameters 

    Langhammer, Lukáš; Šotner, Roman; Domanský, Ondřej (IEEE, 2019-10-31)
    This paper presents a novel solution of an oscillator with electronically adjustable oscillation condition (CO) and frequency of oscillations (FO). Oscillation condition is controlled by current gain and frequency of ...
  • Fracmemristor chaotic oscillator with multistable and antimonotonicity properties 

    Lu, Haikong; Petržela, Jiří; Götthans, Tomáš; Rajagopal, Karthikeyan; Sajad, Jafari; Hussain, Iqtadar (Elsevier, 2020-06-17)
    Memristor is a non-linear circuit element in which voltage-current relationship is determined by the previous values of the voltage and current, generally the history of the circuit. The nonlinearity in this component can ...
  • Fractional-Order Asymptotical Phase Shifter With Flat Magnitude Response 

    Šotner, Roman; Langhammer, Lukáš; Jeřábek, Jan; Dostál, Tomáš (IEEE, 2019-06-26)
    This work deals with design of fractional-order asymptotical phase shifter having constant magnitude response within almost three decades (100 Hz – 100 kHz) and frequency dependent phase difference going from 0 to 45 ...
  • Fractional-order chaotic memory with wideband constant phase elements 

    Petržela, Jiří (MDPI, 2020-04-09)
    This paper provides readers with three partial results that are mutually connected. Firstly, the gallery of the so-called constant phase elements (CPE) dedicated for the wideband applications is presented. CPEs are calculated ...
  • Fractional-Order Hartley Oscillator 

    Agambayev, Agamyrat; Kartci, Aslihan; Hassan, Ali H.; Herencsár, Norbert; Bagci, Hakan; Salama, Khaled Nabil (IEEE, 2018-07-02)
    A fractional-order capacitor (FOC) is developed using a Molybdenum disulfide ferroelectric polymer composite. The fabricated FOC exhibits constant phase over five decades between 100 Hz-10 MHz, which is the broadest operating ...
  • Fractional-Order Low-Pass Filter with Electronic Tunability of Its Order and Pole Frequency 

    Langhammer, Lukáš; Dvořák, Jan; Jeřábek, Jan; Koton, Jaroslav; Šotner, Roman (FEI STU Bratislava, 2018-02-27)
    This paper presents novel solution of a fractional-order low-pass filter (FLPF). The proposed filter operates in the current mode and it is designed using third-order inverse follow-the-leader feedback topology and operational ...
  • Fractional-Order Oscillator Design Using Unity-Gain Voltage Buffers and OTAs 

    Kartci, Aslihan; Herencsár, Norbert; Koton, Jaroslav; Brančík, Lubomír; Vrba, Kamil; Tsirimokou, Georgia; Psychalinos, Costas (IEEE, 2017-08-06)
    In this study, a new voltage-mode fractional-order oscillator using two unity-gain voltage buffers, two operational transconductance amplifiers, one resistor, and two capacitors is presented. The design procedure of ...
  • Fractional-Order Phase Shifters with Constant Magnitude Frequency Responses 

    Šotner, Roman; Langhammer, Lukáš; Jeřábek, Jan; Ushakov, Peter A.; Dostál, Tomáš (Kaunas University of Technology, 2019-10-10)
    This contribution presents and experimentally analyzes the idea how to reach the constant magnitude as well as the phase response in the fractional-order (FO) phase when shifting two-ports. The straightforward method ...
  • Frequency Corrector Using Voltage Differencing Current Conveyor Transconductance Amplifiers 

    Šotner, Roman; Petržela, Jiří; Jeřábek, Jan; Langhammer, Lukáš (IEEE, 2019-11-29)
    This paper brings new type of electronically adjustable bilinear two port (allowing zero, pole and gain adjustment) applied in simple two-band frequency corrector. The bilinear two port employs single current controlled ...
  • Fully-Differential Universal Frequency Filter with Dual-Parameter Control of the Pole Frequency and Quality Factor 

    Langhammer, Lukáš; Šotner, Roman; Dvořák, Jan; Jeřábek, Jan; Zapletal, Miroslav (IEEE, 2018-05-30)
    The paper presents a proposal of modified 2ndorder fully-differential universal frequency filter. Both the pole frequency and quality factor (controlled without disturbing each other) of the filter can be controlled by two ...
  • Generalized single stage class C amplifier: analysis from the viewpoint of chaotic behavior 

    Petržela, Jiří (MDPI, 2020-07-22)
    This paper briefly describes a recent discovery that occurred during the study of the simplest mathematical model of a class C amplifier with a bipolar transistor. It is proved both numerically and experimentally that chaos ...
  • Gradient-Index-Based Frequency-Coded Retroreflective Lenses for mm-Wave Indoor Localization 

    Kaděra, Petr; Jiménez-Sáez, Alejandro; Burmeister, Tom; Láčík, Jaroslav; Schüßler, Martin; Jakoby, Rolf (IEEE, 2020-11-23)
    This article introduces retroreflective lenses for millimeter-wave radio-frequency indoor localization. A three-dimensional (3D) gradient-index Luneburg lens is employed to increase radar cross section (RCS) of photonic-crystal ...
  • Gunshot Recognition using Low Level Features in the Time Domain 

    Hrabina, Martin; Sigmund, Milan (IEEE, 2018-04-19)
    This paper explores the possibility of using scarcely used time-domain features for the task of gunshot recognition. A set of 11 features derived from temporal characteristics (waveform) of signals is calculated from a ...
  • Hamilton’s principle for circuits with dissipative elements 

    Biolek, Zdeněk; Biolek, Dalibor; Biolková, Viera (Hindawi, 2019-10-28)
    The classic form of Hamilton’s variational principle does not hold for circuits with dissipative elements. It is shown in the paper that this may not be true in the case of systems consisting of the so-called higher-order ...
  • High Efficiency Classes of RF Amplifiers 

    Herceg, Erik; Urbanec, Tomáš (International Science and Engineering Society, 2018-02-28)
    This article is dealing with high efficiency RF amplifiers in modern classes F, E and J. The first part is focused on basic function, main parameters and the output matching topologies of the mentioned classes. Output ...
  • High input impedance voltage-mode universal filter and its modification as quadrature oscillator using VDDDAs 

    Tuntrakool, Sunti; Kumngern, Montree; Šotner, Roman; Herencsár, Norbert; Suwanjan, Peerawut; Jaikla, Winai (NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR), 2017-05-23)
    The second order universal voltage-mode filter using voltage differencing differential difference amplifiers (VDDDAs) has been proposed. It has high input impedance voltage-mode biquad filter with orthogonal tune of natural ...
  • High-gain, Circularly-polarized THz Antenna with Proper Modeling of Structures with Thin Metallic Walls 

    Warmowska, Dominika; Atia Abdalmalak, Kerlos; García Muoz, Luis Enrique; Raida, Zbyněk (IEEE, 2020-08-28)
    In the paper, a corporate feed antenna array with slot radiators and a layer of polarizing patches is designed to operate at 350 GHz. The antenna is conceived as a silicon structure fully metalized by gold. Different methods ...