Browsing Ústav radioelektroniky by Title
Now showing items 79-98 of 104
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Performance Analysis of Hybrid FSO Systems Using FSO/RF-FSO Link Adaptation
(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 ... -
Position-Specific Statistics of 60 GHz Vehicular Channels During Overtaking
(IEEE, 2019-01-15)The time-variant vehicle-to-vehicle radio propagation channel in the frequency band from 59.75 to 60.25 GHz has been measured in an urban street in the city center of Vienna, Austria. We have measured a set of 30 ... -
Practical Design of Fractional-Order Oscillator Employing Simple Resonator and Negative Resistor
(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) ... -
Practical Design of Fractional-Order Resonator for Application in the Multiphase Oscillator
(IEEE, 2020-11-25)This contribution introduces a new simple electronically adjustable resonator for implementation in design of the fractional-order multiphase oscillator created with parallel connection of this resonator and negative ... -
Psychological Stress Detection in Speech Using Return-to-opening Phase Ratios in Glottis
(Kaunas University of Technology, 2015-10-12)This paper is focused on investigation of psychological stress in speech signal using shapes of normalised glottal pulses. The pulses were estimated by two algorithms: the Direct Inverse Filtering and Iterative and Adaptive ... -
Reconfigurable Fractional-Order Filter with Electronically Controllable Slope of Attenuation, Pole Frequency and Type of Approximation
(World Scientific Publishing, 2017-03-09)This paper presents design of electronically reconfigurable fractional-order filter that is able to be configured to operate as fractional-order low-pass filter (FLPF) or fractional-order high-pass filter (FHPF). Its slope ... -
Reconnection-less Reconfigurable Low-Pass Filtering Topology Suitable for Higher-Order Fractional-Order Design
(Elsevier, 2020-09-01)The paper discusses a new design of a current–mode reconnection–less reconfigurable fractional–order (FO) low–pass filter of various orders. The filtering structure is based on a 4th–order leap–frog topology using operational ... -
Research of the Operator's Advisory System Based on Fuzzy Logic for Pelletizing Equipment
(MDPI, 2019-11-12)Fertilizer manufacturing in the chemical industry is closely related with agricultural production. More than a half of raw materials for food products are grown by fertilizing plants. The demand of fertilizers has been ... -
Resistor-less Single-purpose or Reconfigurable Biquads Utilizing Single Z-Copy Controlled-Gain Voltage Differencing Current Conveyor
(2017-03-31)Presented work deals with applications of the single Z-Copy Controlled-Gain Voltage Differencing Current Conveyor (ZC-CG-VDCC) in single purpose and multifunctional biquadratic voltage- and current-mode active resistor-less ... -
Resistorless Electronically Tunable Grounded Inductance Simulator Design
(IEEE, 2017-07-05)A new realization of grounded lossless positive inductance simulator (PIS) using simple inverting voltage buffer and unity-gain current follower/inverter (CF±) is reported. Considering the input intrinsic resistance of CF± ... -
The RF Energy Harvesting Antennas Operating in Commercially Deployed Frequency Bands: A Comparative Stud
(Hindawi Publishing Corporation, 2016-04-06)This paper deals with suitable antennas for energy harvesting, which is a growing research field due to the utilization of nowa-days ubiquitous and abundant RF energy. Four types of basic antenna structures suitable for ... -
Řídicí modul pro poziční rotační elektromechanický systém
(International Science and Engineering Society, 2018-02-28)Tento článek prezentuje jedno z možných jednoduchých řešení flexibilního řídicího modulu pro řízení pozičního rotačního elektromechanického systému pomocí osobního počítače (PC). Rotační elektromechanický systém se skládá ... -
Series-, Parallel-, and Inter-Connection of Solid-State Arbitrary Fractional-Order Capacitors: Theoretical Study and Experimental Verification
(IEEE, 2018-02-27)In the paper, general analytical formulas are introduced for the determination of equivalent impedance, magnitude, and phase, i.e. order, for n arbitrary fractional-order capacitors (FoCs) connected in series, parallel, ... -
Simple Oscillator with Enlarged Tunability Range Based on ECCII and VGA Utilizing Commercially Available Analog Multiplier
(De Gruyter, 2016-04-07)This work presents an example of implementation of electronically controllable features to an originally unsuitable circuit structure of oscillator. Basic structure does not allow any electronic control and has mutually ... -
Strange attractors generated by multiple-valued static memory cell with polynomial approximation of resonant tunneling diodes
(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 ... -
Study of impact of voltage gain of comparator on performance of newly designed functional generator
(Elsevier, 2018-07-13)This paper focuses on analysis of impact of voltage gain of comparator on features of designed triangular and sine wave generator. Newly designed generator employs minimal number of passive and active components based on ... -
Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop
(De Gruyter Open, 2015-07-06)The paper deals with precise analysis of simple AC variable gain CMOS amplifier. The circuit can be used as a simple voltage follower (6 MOS transistors are required) or amplifier. The main attention of this work is focused ... -
Synthesis and Optimization of Fractional-Order Elements Using a Genetic Algorithm
(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 ... -
Time-varying K factor of the mm-Wave Vehicular Channel: Velocity, Vibrations and the Road Quality Influence
(IEEE, 2017-10-07)Abstract—This paper evaluates real-world intra-vehicle millimeter-wave (mmWave) channel measurements performed in a vehicular environment. Utilizing a correlative time-domain channel sounder, we demonstrate the dependency ... -
TISO Adjustable Filter with Controllable Controlled-Gain Voltage Differencing Current Conveyor
(Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, 2014-06-02)The main aim of this paper is to present solution of triple-input single-output (TISO) filter with independently adjustable pole frequency, quality factor, bandwidth and also gain. Filter is universal, operates in current ...