U. Cam et al., A new four terminal floating nullor based single-input three-output current-mode multifunction filter, MICROELEC J, 30(2), 1999, pp. 115-118
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.