Browsing Ústav radioelektroniky by Title
Now showing items 39-58 of 104
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Fracmemristor chaotic oscillator with multistable and antimonotonicity properties
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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 ... -
Higher-Order Hamiltonian for Circuits with (alpha,beta) Elements
(MDPI AG, 2020-04-05)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 sigma-circuits, i.e., ... -
Illuminance Sensing in Agriculture Applications Based on Infra-Red Short-Range Compact Transmitter Using 0.35um CMOS Active Device
(IEEE, 2020-01-29)This paper introduces a novel electronic system for simplex low-bitrate infra-red (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 Air-conditioning unit
(BioMed Central, 2015-06-29)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, 2019-12-12)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 ...