Using nullors for realisation of current-mode FTFN-based inverse filters

The authors present a general procedure for the realisation of current-mode four-terminal floating nullor (FTFN)-based inverse filters from the well-developed voltage-mode filters using nullors. Each of the derived filters possesses an inverse transfer function identical to that of the original voltage-mode filter without the need for any matching conditions. The cascadability characteristics of the original circuits have been further investigated. This procedure is expected to be a convenient method for generating current-mode inverse filters