Browsing Ústav radioelektroniky by Title
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Fracmemristor chaotic oscillator with multistable and antimonotonicity properties
(Elsevier, 20200617)Memristor is a nonlinear circuit element in which voltagecurrent relationship is determined by the previous values of the voltage and current, generally the history of the circuit. The nonlinearity in this component can ... 
FractionalOrder Asymptotical Phase Shifter With Flat Magnitude Response
(IEEE, 20190626)This work deals with design of fractionalorder 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 ... 
Fractionalorder chaotic memory with wideband constant phase elements
(MDPI, 20200409)This paper provides readers with three partial results that are mutually connected. Firstly, the gallery of the socalled constant phase elements (CPE) dedicated for the wideband applications is presented. CPEs are calculated ... 
FractionalOrder Hartley Oscillator
(IEEE, 20180702)A fractionalorder capacitor (FOC) is developed using a Molybdenum disulfide ferroelectric polymer composite. The fabricated FOC exhibits constant phase over five decades between 100 Hz10 MHz, which is the broadest operating ... 
FractionalOrder LowPass Filter with Electronic Tunability of Its Order and Pole Frequency
(FEI STU Bratislava, 20180227)This paper presents novel solution of a fractionalorder lowpass filter (FLPF). The proposed filter operates in the current mode and it is designed using thirdorder inverse followtheleader feedback topology and operational ... 
FractionalOrder Oscillator Design Using UnityGain Voltage Buffers and OTAs
(IEEE, 20170806)In this study, a new voltagemode fractionalorder oscillator using two unitygain voltage buffers, two operational transconductance amplifiers, one resistor, and two capacitors is presented. The design procedure of ... 
FractionalOrder Phase Shifters with Constant Magnitude Frequency Responses
(Kaunas University of Technology, 20191010)This contribution presents and experimentally analyzes the idea how to reach the constant magnitude as well as the phase response in the fractionalorder (FO) phase when shifting twoports. The straightforward method ... 
Frequency Corrector Using Voltage Differencing Current Conveyor Transconductance Amplifiers
(IEEE, 20191129)This paper brings new type of electronically adjustable bilinear two port (allowing zero, pole and gain adjustment) applied in simple twoband frequency corrector. The bilinear two port employs single current controlled ... 
FullyDifferential Universal Frequency Filter with DualParameter Control of the Pole Frequency and Quality Factor
(IEEE, 20180530)The paper presents a proposal of modified 2ndorder fullydifferential 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
(MDPI, 20200722)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 ... 
GradientIndexBased FrequencyCoded Retroreflective Lenses for mmWave Indoor Localization
(IEEE, 20201123)This article introduces retroreflective lenses for millimeterwave radiofrequency indoor localization. A threedimensional (3D) gradientindex Luneburg lens is employed to increase radar cross section (RCS) of photoniccrystal ... 
Gunshot Recognition using Low Level Features in the Time Domain
(IEEE, 20180419)This paper explores the possibility of using scarcely used timedomain 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
(Hindawi, 20191028)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 socalled higherorder ... 
High Efficiency Classes of RF Amplifiers
(International Science and Engineering Society, 20180228)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 voltagemode universal filter and its modification as quadrature oscillator using VDDDAs
(NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR), 20170523)The second order universal voltagemode filter using voltage differencing differential difference amplifiers (VDDDAs) has been proposed. It has high input impedance voltagemode biquad filter with orthogonal tune of natural ... 
Highgain, Circularlypolarized THz Antenna with Proper Modeling of Structures with Thin Metallic Walls
(IEEE, 20200828)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 ... 
HigherOrder Hamiltonian for Circuits with (alpha,beta) Elements
(MDPI AG, 20200405)The paper studies the construction of the Hamiltonian for circuits built from the (alpha,beta) elements of Chua’s periodic table. It starts from the Lagrange function, whose existence is limited to sigmacircuits, i.e., ... 
Illuminance Sensing in Agriculture Applications Based on InfraRed ShortRange Compact Transmitter Using 0.35um CMOS Active Device
(IEEE, 20200129)This paper introduces a novel electronic system for simplex lowbitrate infrared (IR) communication applications. The transmitter is implemented completely by analog building blocks, formed with the help of a recently ... 
Implementation of the equivalent temperature measurement system as a part of the vehicle Heating, ventilation and Airconditioning unit
(BioMed Central, 20150629)Thermal comfort evaluation based on the Comfort zone diagram is relatively new and promising method [1] developed by Hkan O. Nilsson [2]. The method was developed mainly for non uniform indoor environments [3] such as ... 
Improved RMS Delay Spread Estimation for mmWave Channels Using Savitzky–Golay Filters
(MDPI, 20191212)In this paper, a novel method for improving the estimation accuracy of the root mean square (RMS) delay spread from the magnitude of the Channel Transfer Function (CTF) is presented. We utilize the level crossing rate ...