Title :
Study of practical problems in two-loop CCTA based biquad: Finite attenuations in stop bands
Author :
Jerabek, J. ; Sotner, R. ; Kincl, Z. ; Dostal, T. ; Vrba, K.
Author_Institution :
Dept. of Telecommun., Brno Univ. of Technol., Brno, Czech Republic
Abstract :
Quite neglected and underlying problem of modern active functional blocks is presented and demonstrated in this contribution on a current-mode active filter. The discussed problem is an undesirable transfer in stop band of multifunctional frequency filters. It is caused by several occasions related to small-signal parameters of active elements (impedance levels) in the circuit. In some cases it leads to parasitic feedback and undesirable transfers in circuit. Problems are discussed on example with KHN-type filter where quite novel active element known as Current Conveyor Transconductance Amplifier (CCTA) is used.
Keywords :
biquadratic filters; current conveyors; operational amplifiers; KHN-type filter; active functional blocks; biquad filters; current conveyor transconductance amplifier; current-mode active filter; finite attenuations; multifunctional frequency filters; two-loop CCTA; Attenuation; Band-pass filters; Filtering theory; Finite element analysis; Transconductance; Transfer functions;
Conference_Titel :
Electrical and Electronics Engineering (ELECO), 2013 8th International Conference on
Conference_Location :
Bursa
Print_ISBN :
978-605-01-0504-9
DOI :
10.1109/ELECO.2013.6713932
