Now showing items 26-45 of 104

  • 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 ...
  • 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 ...
  • Design of Signal Generators Using Active Elements Developed in I3T25 CMOS Technology Single IC Package for Illuminance to Frequency Conversion 

    Šotner, Roman; Jeřábek, Jan; Polák, Ladislav; Kledrowetz, Vilém; Prokop, Roman (MDPI, 2020-02-21)
    This paper presents a compact and simple design of adjustable triangular and square wave functional generators employing fundamental cells fabricated on a single integrated circuit (IC) package. Two solutions have ...
  • Design of the simple oscillator with linear tuning and pi/4 phase shift based on emulator of the modified current differencing unit 

    Šotner, Roman; Jeřábek, Jan; Herencsár, Norbert; Vrba, Kamil (The Institute of Electronics, Information and Communication Engineers (IEICE), 2015-10-10)
    This paper presents a simple oscillator with 45 degrees phase shift between output signals. A Modified current Differencing Unit (MCDU) was used for its design. The MCDU offers controllability of input resistances ...
  • Digitally Controllable Current Amplifier and Current Conveyors in Practical Application of Controllable Frequency Filter 

    Polák, Josef; Jeřábek, Jan; Langhammer, Lukáš; Šotner, Roman; Dvořák, Jan; Pánek, David (Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, 2016-09-04)
    This paper presents the simulations results in comparison with the measured results of the practical realization of the multifunctional second order frequency filter with a Digitally Controlled Current Amplifier (DACA) and ...
  • Digitally-Compensated Wideband 60 GHz Test-Bed for Power Amplifier Predistortion Experiments 

    Pospíšil, Martin; Maršálek, Roman; Götthans, Tomáš; Urbanec, Tomáš (MDPI, 2021-02-20)
    Millimeter waves will play an important role in communication systems in the near future. On the one hand, the bandwidths available at millimeter-wave frequencies allow for elevated data rates, but on the other hand, the ...
  • Dual-Mode Multifunctional Reconnection-less Reconfigurable Filter 

    Langhammer, Lukáš; Šotner, Roman; Dvořák, Jan; Dostál, Tomáš (Kaunas University of Technology, 2020-06-29)
    A novel solution of a reconnection-less reconfigurable filter is being presented. The filter works in the current mode, voltage mode and mixed mode (voltage to current) offering sixteen transfer functions in total. The ...
  • 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 ...
  • 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 ...
  • 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 ...