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A Single-Ended and Fully-Differential Universal Current-Mode Frequency Filter with MO-CF and DACA ElementsLANGHAMMER, L. , JERABEK, J. , POLAK, J. , PANEK, D.
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active filters, analog circuits, current-mode circuits, differential amplifiers, frequency control
current(30), mode(19), filter(16), universal(13), electronics(11), systems(6), communications(6), circuits(6), biquad(6), single(5)
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About this article
Date of Publication: 2016-08-31
Volume 16, Issue 3, Year 2016, On page(s): 43 - 48
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2016.03007
Web of Science Accession Number: 000384750000007
SCOPUS ID: 84991110331
The paper presents proposal of the 2nd-order universal frequency filter. The presented filter operates in the current-mode and it is designed in the single-ended and fully-differential form. Signal-flow graphs (SFG) method has been used in the proposal. The proposed filter is employing multi-output current followers (MO-CFs) and digitally adjustable current amplifiers (DACAs) as active elements. The pole frequency of the filter can be controlled without disturbing its quality factor. Functionality of the proposed filter in both S-E and F-D form has been verified by PSpice simulations using available models of used active elements and also by experimental measurements. A comparison of simulation and experimental results of the S-E and F-D form of the presented filter is made. Subsequently, a comparison of experimental results of both forms of the filter is also included.
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