Multifunction mixed-mode filter using FTFNs

A novel mixed-mode multifunction filter configuration containing three FTFNs and only five passive components with a single input and three different outputs is presented. The configuration can be driven by a voltage or current source while as outputs are always voltages and currents. The circuit can thus realize filtering functions in normal-mode as well as in mixed-mode. Besides having small active and passive sensitivities, the parameters resonance frequency (ω0) and bandwidth (ω0/Q) enjoy orthogonal tuning. The theoretical results are verified by PSPICE simulations.

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