%0 Journal Article %T All-Pass Filters in Current Mode %A T. Dostal %J Radioengineering %D 2005 %I Spolecnost pro radioelektronicke inzenyrstvi %X Analogue first, second and high-order all-pass active filters in thecurrent mode, with constant group delay and magnitude responses, arepresented in this paper. These filters are based on a modification ofthe multi-loop feedback canonical structures using signal flow graphs.Implementations by multi-output transconductors, namely classical OTAsand novel CDTAs are given. %U www.radioeng.cz/fulltexts/2005/05_03_48_53.pdf