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Novel active function blocks and their applications in frequency filters and quadrature oscillators
Herencsár, Norbert ; Zahradník, Pavel (oponent) ; Kolka, Zdeněk (oponent) ; Lattenberg, Ivo (vedoucí práce)
Frequency filters and sinusoidal oscillators are linear electric circuits that are used in wide area of electronics and also are the basic building blocks in analogue signal processing. In the last decade, huge number of active building blocks (ABBs) were presented for this purpose. In 2000 and 2006, the universal current conveyor (UCC) and the universal voltage conveyor (UVC), respectively, were designed at the Department of Telecommunication, BUT, Brno, and produced in cooperation with AMI Semiconductor Czech, Ltd. There is still the need to develop new active elements that offer new advantages. The main contribution of this thesis is, therefore, the definition of other novel ABBs such as the differential-input buffered and transconductance amplifier (DBTA), the current follower transconductance amplifier (CFTA), the z-copy current-controlled current inverting transconductance amplifier (ZC-CCCITA), the generalized current follower differential input transconductance amplifier (GCFDITA), the voltage gain-controlled modified current-feedback operational amplifier (VGC-MCFOA), and the minus-type current-controlled third-generation voltage conveyor (CC-VCIII-). Using the proposed ABBs, novel structures of first-order all-pass filters, second-order universal filters, KHN-equivalent circuits, inverse filters, active grounded inductance simulators, and quadrature sinusoidal oscillators working in the current-, voltage-, or mixed-mode are presented. The behavior of the proposed circuits has been verified by SPICE simulations and in selected cases also by experimental measurements.
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Studium retence a separace pesticidů v různých módech kapalinové chromatografie
Dérerová, Tímea ; Kalíková, Květa (vedoucí práce) ; Riesová, Martina (oponent)
3 Abstrakt Předkládaná bakalářská práce byla zaměřena na separaci směsi šesti pesticidů v reverzním a "mixed módu" vysokoúčinné kapalinové chromatografie na kolonách Atlantis dC18, XSelect CSH C18, XSelect CSH Fluoro-Phenyl a Atlantis Premier BEH C18 AX. Stejné výrobní parametry - rozměry kolony a částic nosiče, umožnily vzájemné porovnávání stacionárních fází z hlediska "retentivity" a selektivity. Hodnocené byly na základě Waltersova testu, kategorizujícího stacionární fáze podle jejich hydrofobicity, silanolové aktivity a účinnosti. Separovanými analyty byly pesticidy s různým mechanismem účinku v životním prostředí. Dva pesticidy obsahovaly disociovatelnou kyselou funkční skupinu, což způsobilo, že při složení mobilní fáze voda/acetonitril eluovaly s mrtvým časem kolony. K potlačení disociace byly místo vody použity pufry, konkrétně 10mM octan amonný, pH 4,7 a 10mM mravenčan amonný, pH 3,0. Použití těchto pufrů v mobilní fázi vedlo ke zvýšení retence těchto pesticidů na všech testovaných kolonách. Kolony vykazovaly různou retenci a selektivitu pro pesticidy a k optimalizaci separačních podmínek se postupovalo experimentální metodou, zásahem do chromatografických parametrů, a to změnou složení mobilní fáze, pH a teploty. Bylo prokázáno, že jak retenční čas, tak rozlišení a tvar chromatografického píku...
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Novel active function blocks and their applications in frequency filters and quadrature oscillators
Herencsár, Norbert ; Zahradník, Pavel (oponent) ; Kolka, Zdeněk (oponent) ; Lattenberg, Ivo (vedoucí práce)
Frequency filters and sinusoidal oscillators are linear electric circuits that are used in wide area of electronics and also are the basic building blocks in analogue signal processing. In the last decade, huge number of active building blocks (ABBs) were presented for this purpose. In 2000 and 2006, the universal current conveyor (UCC) and the universal voltage conveyor (UVC), respectively, were designed at the Department of Telecommunication, BUT, Brno, and produced in cooperation with AMI Semiconductor Czech, Ltd. There is still the need to develop new active elements that offer new advantages. The main contribution of this thesis is, therefore, the definition of other novel ABBs such as the differential-input buffered and transconductance amplifier (DBTA), the current follower transconductance amplifier (CFTA), the z-copy current-controlled current inverting transconductance amplifier (ZC-CCCITA), the generalized current follower differential input transconductance amplifier (GCFDITA), the voltage gain-controlled modified current-feedback operational amplifier (VGC-MCFOA), and the minus-type current-controlled third-generation voltage conveyor (CC-VCIII-). Using the proposed ABBs, novel structures of first-order all-pass filters, second-order universal filters, KHN-equivalent circuits, inverse filters, active grounded inductance simulators, and quadrature sinusoidal oscillators working in the current-, voltage-, or mixed-mode are presented. The behavior of the proposed circuits has been verified by SPICE simulations and in selected cases also by experimental measurements.
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