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Modified Current Differencing Unit and its Application for Electronically Reconfigurable Simple First-order Transfer FunctionSOTNER, R. , JERABEK, J. , HERENCSAR, N. , ZAK, T. , JAIKLA, W. , VRBA, K.
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Current differencing unit, controllable current gain, controllable intrinsic current input resistance, reconfigurability, multifunctional filter.
current(32), signal(15), mode(14), sotner(13), processing(11), filters(11), filter(11), circuits(11), jerabek(10), dostal(10)
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About this article
Date of Publication: 2015-02-28
Volume 15, Issue 1, Year 2015, On page(s): 3 - 10
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2015.01001
Web of Science Accession Number: 000352158600001
SCOPUS ID: 84924811819
Modified current differencing unit (MCDU) and its simple filtering application are introduced in this paper. Modification of the well-known current differencing unit consists in weighted difference of both input currents controlled by adjustable current gain, controllable intrinsic resistance of both current input terminals, and availability of additional voltage terminal(s). Definition of MCDU therefore requires four adjustable parameters (B1, B2, Rp, Rn). A presented active element offers and combines benefits of electronically controllable current conveyor of second generation and current differencing unit and allows synthesis of interesting adjustable applications, which are not available by classical approaches based on simple elements. MCDU brings variability of the transfer function into the structure. It provides several transfer types without necessity of input or output node change by simple electronic tuning. A presented structure represents so-called reconnection-less reconfigurable current-mode filter for realization of all-pass, inverting high-pass, low-pass and direct transfer response. Behavioral model of the MCDU was prepared and carefully tested in filtering application. Spice simulations and measurements confirmed theoretical assumptions.
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Faculty of Electrical Engineering and Computer Science
Stefan cel Mare University of Suceava, Romania
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