Current-mode high output impedance multifunction filters employing minimumnumber of FTFNs

In this study, five current-mode FTFN-based multifunction filters are propo sed, which realize the same transfer functions in ideal case. All circuits employ two capacitors and three resistors. For each circuit R-C:C-R transfo rmation increases the number of realization possibilities to ten. The propo sed topologies simultaneously realize three basic filtering functions using minimum number of FTFNs and provide high output impedances that enable eas y cascading in current mode. Sensitivity analysis of the filters show that they have low passive sensitivities, omega (0), Q and omega (0)/Q of the fi lters are insensitive to current tracking errors, furthermore omega (0) of the filters are insensitive to voltage tracking errors of the FTFNs. The pr oposed circuits do not require component matching condition except for notc h and allpass responses and permit independent adjustment of omega (0) with out disturbing omega (0)/Q. Experimental and simulation results are given t o verify the theoretical analyses.