oddělení-TKO-SIX

Browse

Recent Submissions

Now showing 1 - 5 of 26
  • Thumbnail Image
    Item
    Voltage Gain-Controlled Third-Generation Current Conveyor and its All-Pass Filter Verification
    (IEEE, 2017-09-04) Herencsár, Norbert; Kartci, Aslihan; Koton, Jaroslav; Tsirimokou, Georgia; Psychalinos, Costas
    The paper presents a new active building block (ABB) called minus-type voltage gain-controlled third-generation current conveyor (VGC-CCIII) in which the voltage gain between Y to X terminal can be controlled. The usefulness of the tunable feature in the presented ABB is demonstrated in current-mode {0.3rd; 0.5th; 0.7th; 1st}-order all-pass filter (APF) employing single VGC-CCIII, one capacitor, and one resistor. The theoretical results of the integer- and fractional-order APF are verified by SPICE simulations based on readily available IC OPA860 macromodel, which can also be used in experiments.
  • Thumbnail Image
    Item
    Location Accuracy of Commercial IP Address Geolocation Databases
    (Kaunas University of Technology, 2017-10-04) Komosný, Dan; Vozňák, Miroslav; Rehman, Saeed
    This paper deals with finding the geographical location of Internet nodes remotely with no need to communicate with the nodes located (client-independently). IP geolocation is used in a number of areas, such as content personalisation, on-line fraud prevention and detection, and digital media law enforcement. One of the main concerns when studying the accuracy of client-independent geolocation is the groundtruth dataset. As we show in the related work, the used groundtruth influences the results a lot. We construct an error-free groundtruth dataset consisting of nodes with GPS-precise locations. We also record the country, region, city, and ISP for each groundtruth node. Using the created groundtruth, we study the accuracy of eight IP location databases in a number of scenarios, such as effect of city area and population, effect of ISP assignment, and number of not-returned locations.
  • Thumbnail Image
    Item
    Differential Second-Order Voltage-Mode All-Pass Filter Using Current Conveyors
    (Kaunas University of Technology, 2016-10-10) Koton, Jaroslav; Herencsár, Norbert; Horng, Jiun-Wei
    In this paper, a new circuit solution of analogue pseudo-differential second-order all-pass filter operating in the voltage mode is presented. Pseudo-differential, since both input and output terminals are differential, however, the circuit topology features single-ended structure. As active elements the differential difference current conveyors and second-generation current conveyors are advantageously used. The proposed filter features quality factor control without disturbing the polefrequency using single passive element. The designed circuit is less complex compared to fully-differential solutions by maintaining sufficient common-mode rejection ratio. The behaviour of the filter is described by means of symbolic analysis and also by simulations using the UCC-N1B integrated circuit. Furthermore, the performance of the proposed pseudo- differential filter has been validated by experimental measurements.
  • Thumbnail Image
    Item
    Universal Pseudo-Differential Filter Using DDCC and DVCCs
    (Kaunas University of Technology, 2017-12-18) Sládok, Ondřej; Koton, Jaroslav; Herencsár, Norbert
    In the paper, a universal preudo-differential second-order filter operating in voltage mode, where both input and output are differential, is presented. The circuit is formed by one differential difference current conveyor (DDCC), two differential voltage current conveyors (DVCCs), and five passive elements. The filter is characterized by high input impedance, minimum number of passive elements that are all grounded, and high common-mode rejection ratio (CMRR). The proposed filter structure is able to realize all five standard frequency filter responses. Non-ideal analysis has been performed by considering the real parasitic parameters of the active elements. The optimization of passive element values has been done in terms of minimal shift of the pole-frequency and to obtain the maximum stop-band attenuation of the high-pass filter response. Functionality is verified by simulations and experimental measurements using readily available integrated circuit UCC-N1B 0520.
  • Thumbnail Image
    Item
    Universal Voltage Conveyor and its Novel Dual-Output Fully-Cascadable VM APF Application
    (MDPI, 2017-03-20) Herencsár, Norbert; Koton, Jaroslav; Hanák, Pavel
    This letter presents a novel realization of a voltage-mode (VM) first-order all-pass filter (APF) with attractive features. The proposed circuit employs a single readily available six-terminal active device called as universal voltage conveyor (UVC) and only grounded passive components, which predict its easy monolithic integration with desired circuit simplicity. The auxiliary voltage input (W) and output (ZP, ZN) terminals of the device fully ensure easy cascadability of VM APF, since the input and output terminal impedances are theoretically infinitely high and zero, respectively. Moreover, thanks to mutually inverse outputs of the UVC, the proposed filter simultaneously provides both inverting and non-inverting outputs from the same configuration. All of these features make the UVC a unique active device currently available in the literature. The behavior of the filter was experimentally measured using the readily available UVC-N1C 0520 chip, which was produced in cooperation with ON Semiconductor Czech Republic, Ltd.