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Analytical synthesis of odd/even‐ n th‐order elliptic Cauer filter structures using OTRAs
Author(s) -
Chang ChunMing,
Swamy M. N. S.
Publication year - 2013
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.1827
Subject(s) - operational transconductance amplifier , operational amplifier , amplifier , capacitance , transconductance , filter (signal processing) , transfer function , elliptic filter , sensitivity (control systems) , order (exchange) , mathematics , control theory (sociology) , topology (electrical circuits) , computer science , electronic engineering , low pass filter , electrical engineering , engineering , physics , bandwidth (computing) , prototype filter , telecommunications , voltage , transistor , artificial intelligence , control (management) , quantum mechanics , electrode , finance , economics
SUMMARY The operational transresistance amplifier (OTRA), the dual of the well‐known operational transconductance amplifier, is an attractive element for use in circuit design. One odd‐ n th‐order and two even‐ n th‐order OTRA‐R‐C or OTRA‐MOS‐C elliptic Cauer filter structures are presented using new analytical synthesis methods (ASMs). Because it is assumed in the synthesis procedure that the transresistance R m → ∞, but in view of the fact that R m is finite in practice, the more the number of OTRAs employed, the worse the precision of the output signals. By studying the sensitivity of the output to component variations, more precise output may be obtained by selecting one or two appropriate capacitance(s)/resistance(s) and adjusting their values suitably. H‐spice simulations are given to validate and demonstrate the theoretical predictions. Copyright © 2012 John Wiley & Sons, Ltd.