1. Biolek D, Senani R, Biolkova V, Kolka Z (2008) Active elements for analog signal processing: classification, review and new proposals. Radioengineering 17:15–32
2. Erkan Y, Minaei S, (2007) Realization of various active devices using commercially available AD844s and external resistors. Electron World 113:46–49
3. Siripruchyanun C, Silapan J (2008) BiCMOS current-controlled current feedback amplifier (CC-CFA) and its applications. WSEAS Trans Electron 6:203–219
4. Huijsing JH, Korte D (1977) Monolithic nullor-a universal active network element. IEEE J Solid State Circ 21:59–64
5. Huijsing JH (1990) Operational floating amplifier. IEE Proc 137:131–136