Recent Submissions

  • Design of Fractional-Order Integrator Controlled by Single Voltage Gain 

    Šotner, Roman; Petržela, Jiří; Jeřábek, Jan; Herencsár, Norbert; Andriukaitis, Darius (IEEE, 2019-07-01)
    This work presents analyses of interaction of fractional- and integer-order transfer functions when their responses are added together by simple linear operation of sum. The mathematical background is very complex but ...
  • Comparative Study of Op-Amp-based Integrators Suitable for Fractional-Order Controller Design 

    Herencsár, Norbert; Kartci, Aslihan; Yildiz, Hacer A.; Šotner, Roman; Dvořák, Jan; Kubánek, David; Jeřábek, Jan; Koton, Jaroslav (IEEE, 2019-07-01)
    In this paper, a fractional-order capacitor (FOC) of an order = 0.89 (i.e. constant phase angle –80.1 degree) was emulated via Valsa RC network with five branches. The network component values were optimized using modified ...
  • Synthesis and Optimization of Fractional-Order Elements Using a Genetic Algorithm 

    Kartci, Aslihan; Agambayev, Agamyrat; Farhat, Mohamed; Herencsár, Norbert; Brančík, Lubomír; Bagci, Hakan; Salama, Khaled Nabil (IEEE, 2019-06-14)
    This study proposes a new approach for the optimization of phase and magnitude responses of fractional-order capacitive and inductive elements based on the mixed integer-order genetic algorithm (GA), over a bandwidth of ...
  • Millimeter Wave Vehicular Channel Emulation: A Framework for Balancing Complexity and Accuracy 

    Blazek, Thomas; Zöchmann, Erich; Mecklenbräuker, Christoph (MDPI, 2018-11-16)
    We propose a general framework for the specification of a sparse representation of millimeter wave vehicular propagation channels and apply this to both synthetic data and real-world observations from channel sounding ...
  • CMOS Current Feedback Operational Amplifier-Based Relaxation Generator for Capacity to Voltage Sensor Interface 

    Polák, Ladislav; Šotner, Roman; Petržela, Jiří; Jeřábek, Jan (MDPI, 2018-12-18)
    This paper presents a simple relaxation generator, suitable for a sensor interface, operating as a transducer of capacitance to frequency/period. The proposed circuit employs a current feedback operational amplifier, ...
  • In-vehicle channel sounding in the 5.8-GHz band 

    Kukolev, Pavel; Chandra, Aniruddha; Mikulášek, Tomáš; Prokeš, Aleš; Zemen, Thomas; Mecklenbräuker, Christoph (Springer, 2015-03-10)
    The article reports vehicular channel measurements in the frequency band of 5.8 GHz for IEEE 802.11p standard. Experiments for both intra-vehicle and out-of-vehicle environments were carried out. It was observed that the ...
  • Strange attractors generated by multiple-valued static memory cell with polynomial approximation of resonant tunneling diodes 

    Petržela, Jiří (MDPI, 2018-09-12)
    This paper brings analysis of the multiple-valued memory system (MVMS) composed by a pair of the resonant tunneling diodes (RTD). Ampere-voltage characteristic (AVC) of both diodes is approximated in operational voltage ...
  • 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 ...
  • 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. ...
  • A Novel Pseudo-Differential Integer/Fractional-Order Voltage-Mode All-Pass Filter 

    Herencsár, Norbert; Šotner, Roman; Kartci, Aslihan; Vrba, Kamil (IEEE, 2018-05-08)
    The paper presents the first- (integer) and fractional-order case studies of a novel pseudo-differential (P-D) voltage-mode all-pass filter (APF) employing a single differential voltage current conveyor (DVCC), one resistor, ...
  • Novel first-order all-pass filter applications of z-copy voltage differencing current conveyor 

    Šotner, Roman; Herencsár, Norbert; Jeřábek, Jan; Vrba, Kamil; Dostál, Tomáš; Jaikla, Winai; Metin, Bilgin (NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR), 2015-08-05)
    The application of z-copy voltage differencing current conveyor (ZC-VDCC) in simple and interesting first-order all-pass sections has been studied in the present paper. The solutions presented here have presumptions for ...
  • Dynamical Tangles in Third-Order Oscillator with Single Jump Function 

    Götthans, Tomáš; Petržela, Jiří; Guzan, Milan (Hindawi, 2014-09-18)
    This contribution brings a deep and detailed study of the dynamical behavior associated with nonlinear oscillator described by a single third-order differential equation with scalar jump nonlinearity. The relative primitive ...
  • Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency 

    Šotner, Roman; Jeřábek, Jan; Langhammer, Lukáš; Dvořák, Jan (MDPI, 2018-08-22)
    This paper shows the topology design of a simple second-order oscillator based on two three-port current conveyors, two resistors, and two grounded capacitors, as well as its modification to a voltage-controlled oscillator ...
  • Practical Design of Fractional-Order Oscillator Employing Simple Resonator and Negative Resistor 

    Šotner, Roman; Jeřábek, Jan; Domanský, Ondřej; Herencsár, Norbert; Kartci, Aslihan; Dvořák, Jan (IEEE, 2018-11-08)
    This contribution presents straightforward design of a fractional-order oscillator employing novel simple impedance inverter (implementing differential voltage current conveyor transconductance amplifier as active element) ...
  • Analysis and Verification of Identical-Order Mixed-Matrix Fractional-Order Capacitor Networks 

    Kartci, Aslihan; Agambayev, Agamyrat; Herencsár, Norbert; Salama, Khaled Nabil (IEEE, 2018-07-02)
    In the open literature while capacitors are introduced with -90 degrees phase angle, here we described our fabricated polymer composite, mixed matrix, as a fractional-order capacitor (FoC). The effect on phase and ...
  • 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 ...
  • New chaotic dynamical system with a conic-shaped equilibrium located on the plane structure 

    Petržela, Jiří; Götthans, Tomáš (MDPI, 2017-09-22)
    This paper presents a new autonomous deterministic dynamical system with equilibrium degenerated into a plane-oriented hyperbolic geometrical structure. It is demonstrated via numerical analysis and laboratory experiments ...
  • Performance Analysis of Hybrid FSO Systems Using FSO/RF-FSO Link Adaptation 

    Bag, Banibrata; Das, Akinchan; Ansari, Imran Shafique; Prokeš, Aleš; Bose, Chayanika; Chandra, Aniruddha (IEEE, 2018-05-16)
    Free-space optical (FSO) links are considered as cost-effective, non-invasive alternative to fiber optic cables for 5G cellular backhaul networking. For FSO based backhaul networks we propose an additional millimeter-wavelength ...
  • Duality of Complex Systems Built from Higher-Order Elements 

    Biolek, Dalibor; Biolek, Zdeněk; Biolková, Viera (Hindawi, 2018-09-07)
    The duality of nonlinear systems built from higher-order two-terminal Chua’s elements and independent voltage and current sources is analyzed. Two different approaches are now being generalized for circuits with 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 ...

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