Browsing Ústav telekomunikací by Issue Date
Now showing items 1-20 of 266
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Multifunction RF Filters Using OTA
(Springer, 2007-09-03)In this paper the procedure of RF filter design using two active elements OTA is shown. The general method of filter design using OTA amplifiers, when the fully connected feedback network was designed around the two OTA ... -
Videokonferenční technologie v praxi - Vidět a slyšet na dálku
(Thomas Taylor s.r.o., 2008-01-20)Článek podrobně rozebírá problematiku videokonferenční technologie. Vysvětluje jednotlivé základní části použitých zařízení a skupin protokolů. V konečné části poskytuje přehled hardwarové a softwarové implementace ... -
A Novel Current-Mode SIMO Type Universal Filter Using CFTAs
(Hikari Ltd., 2009-02-01)In this paper a new active element for the realization of current-mode analog blocks Current Follower Transconductance Amplifier (CFTA) is presented. The element is a combination of the Current Follower (CF) and the Balanced ... -
New voltage-mode universal filter and sinusoidal oscillator using only single DBTA
(Taylor & Francis, 2010-04-01)In this article, a new voltage-mode second-order universal frequency filter and sinusoidal oscillator using only single differential-input buffered and transconductance amplifier (DBTA) is presented. The proposed voltage-mode ... -
Realisations of single-resistance-controlled quadrature oscillators using a generalised current follower transconductance amplifier and a unity-gain voltage-follower
(Taylor & Francis, 2010-08-01)This article presents realisations of single-resistance-controlled-oscillators (SRCOs) using the recently proposed modern active building block (ABB), namely the generalised current follower transconductance amplifier ... -
Real-Time Guitar Preamp Simulation Using Modified Blockwise Method and Approximations
(Springer Nature, 2011-04-07)The designing of algorithms for real-time digital simulation of analog effects and amplifiers brings two contradictory requirements: accuracy versus computational efficiency. In this paper, the simulation of a typical ... -
Goertzel Algorithm Generalized to Non-integer Multiples of Fundamental Frequency
(SpringerOpen, 2012-03-22)The paper deals with the Goertzel algorithm, used to establish the modulus and phase of harmonic components of a signal. The advantages of the Goertzel approach over the DFT and the FFT in cases of a few harmonics of ... -
An electronically tunable current-mode quadrature oscillator using PCAs
(Taylor & Francis, 2012-04-10)The paper presents a new realization of active RC sinusoidal oscillator with electronically tunable condition and frequency of oscillation. As compared to the class of three resistors, two capacitors (3R-2C) based canonic ... -
CMOS-based active RC sinusoidal oscillator with four-phase quadrature outputs and single-resistance-controlled (SRC) tuning laws
(Elsevier, 2012-09-07)This paper proposes a very compact CMOS realization of active RC sinusoidal oscillator capable of generating four quadrature voltage outputs. The oscillator is based on the cascade of lossless and lossy integrators in loop. ... -
A Voltage Gain-Controlled Modified CFOA And Its Application in Electronically Tunable Four-Mode All-Pass Filter Design
(International Science & Engineering Society, o.s., 2012-10-31)This paper presents a new active building block (ABB) called voltage gain-controlled modified current feedback amplifier (VGC-MCFOA) based on bipolar junction transistor technology. The versatility of the new ABB is ... -
An Additional Approach to Model Current Followers and Amplifiers with Electronically Controllable Parameters from Commercially Available ICs
(Versita, 2012-11-22)Several behavioral models of current active elements for experimental purposes are introduced in this paper. These models are based on commercially available devices. They are suitable for experimental tests of current- ... -
New Resistorless and Electronically Tunable Realization of Dual-Output VM All-Pass Filter Using VDIBA
(Springer, 2013-01-07)In this paper, a new active element called voltage differencing inverting buffered amplifier (VDIBA) is presented. Using single VDIBA and a capacitor, a new resistorless voltage-mode (VM) first-order all-pass filter (APF) ... -
Realization of first-order current-mode filters with low number of MOS transistors
(World Scientific Publishing Company, 2013-01-14)In this paper, a new current-mode (CM) circuit for realizing all of the first-order filter responses is suggested. The proposed configuration contains low number of components, only two NMOS transistors both operating in ... -
New double current controlled CFA (DCC-CFA) based voltage-mode oscillator with independent electronic control of oscillation condition and frequency
(FEI STU, 2013-03-27)In this paper, a new electronically tunable quadrature oscillator (ETQO) based on two modified versions of current feedback amplifiers (CFAs), the so called double current controlled CFA (DCC-CFAs) is presented. The frequency ... -
Novel Oscillator Based on Voltage and Current-Gain Adjusting Used for Control of Oscillation Frequency and Oscillation Condition
(Kaunas University of Technology, 2013-06-13)The paper deals with novel controllable oscillator where two types of electronic control are used. Proposed second-order circuit contains current follower, adjustable current amplifier, adjustable voltage amplifier, two ... -
New resistorless tunable voltage-mode universal filter using single VDIBA
(Springer, 2013-08-01)To increase the universality of the recently introduced voltage differencing inverting buffered amplifier (VDIBA), this letter presents a new voltage-mode (VM) multi-input–single-output (MISO) universal filter. The proposed ... -
Automatic Brain Tumor Detection in T2-weighted Magnetic Resonance Images
(Versita Open, 2013-11-02)This work focuses on fully automatic detection of brain tumors. The first aim is to determine, whether the image contains a brain with a tumor, and if it does, localize it. The goal of this work is not the exact segmentation ... -
Komprimované snímání perfúzního zobrazování v MRI
(Společnost elektrotechnického inženýrství, 2013-11-20)Perfúzní zobrazování v MRI je lékařská diagnostická metoda, kdy pacientovi podáme kontrastní látku a poté průběžně sledujeme průběh její koncentrace v postižené oblasti. Tuto závislost můžeme přibližně matematicky popsat ... -
Towards an Optimal Interest Point Detector for Measurements in Ultrasound Images
(Versita Open, 2013-12-16)This paper focuses on the comparison of different interest point detectors and their utilization for measurements in ultrasound (US) images. Certain medical examinations are based on speckle tracking which strongly relies ... -
New Compact VM Four-Phase Oscillator Employing Only Single Z-Copy VDTA And All Grounded Passive Elements
(Kaunas University of Technology, 2013-12-16)In this paper, a new compact voltage-mode four-phase oscillator employing single z-copy voltage differencing transconductance amplifier (ZC-VDTA) and only grounded passive elements is introduced. The use of only grounded ...