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 multif unction filter is presented. The circuit uses four four terminal floating n ullors (FTFNs) and six passive components, four of them are grounded and ca n simultaneously realise low-pass, band-pass and high-pass filter functions without changing the circuit topology and elements. It does not require an y parameter matching condition and has the possibility of independent adjus tment of omega(o) without disturbing omega(o)/Q. Sensitivity analysis of th e filter shows that it has low passive sensitivities and omega(o), Q and om ega(o)/Q of the filter are insensitive to current tracking errors, furtherm ore omega(o) of the filter is insensitive to voltage tracking errors of the FTFNs. All outputs of the multifunction filter exhibit high output impedan ces so that the synthesised current-mode filters can be cascaded without ad ditional buffers. The theoretical results are verified by PSPICE simulation s. (C) 1999 Elsevier Science Ltd. All rights reserved.