A new four terminal floating nullor based single-input three-output current-mode multifunction filter

In this study, a new circuit configuration to realise a current-mode multifunction filter is presented. The circuit uses four four terminal floating nullors (FTFNs) and six passive components, four of them are grounded and can simultaneously realise low-pass, band-pass and high-pass filter functions without changing the circuit topology and elements. It does not require any parameter matching condition and has the possibility of independent adjustment of omega(o) without disturbing omega(o)/Q. Sensitivity analysis of the filter shows that it has low passive sensitivities and omega(o), Q and omega(o)/Q of the filter are insensitive to current tracking errors, furthermore omega(o) of the filter is insensitive to voltage tracking errors of the FTFNs. All outputs of the multifunction filter exhibit high output impedances so that the synthesised current-mode filters can be cascaded without additional buffers. The theoretical results are verified by PSPICE simulations. (C) 1999 Elsevier Science Ltd. All rights reserved.