Open AccessA Single-Ended and Fully-Differential Universal Current-Mode Frequency Filter with MO-CF and DACA Elements
Author(s) -
Lukáš Langhammer,
Jan Jeřábek,
Josef Polák,
Daria Panek
Publication year - 2016
Publication title -
advances in electrical and computer engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 23
eISSN - 1844-7600
pISSN - 1582-7445
DOI - 10.4316/aece.2016.03007
Subject(s) - current (fluid) , filter (signal processing) , mode (computer interface) , differential (mechanical device) , computer science , electronic engineering , physics , electrical engineering , engineering , computer vision , thermodynamics , operating system
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