Voltage/Current-Mode Universal Filter Using FTFN and CFA |
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Authors: | Nisar?Ahmad?Shah Email author" target="_blank">Mohmad?Amin?MalikEmail author |
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Affiliation: | (1) Postgraduate Department of Electronics & Instrumentation Technology, The University of Kashmir, Srinagar, 190006, India |
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Abstract: | A novel configuration for realizing voltage/current-mode (VM/CM) universal filter using a single four terminal floating nullor
(FTFN), a single current feedback amplifier (CFA), two capacitors and three resistors is presented. The VM configuration has
three inputs and a single output and implements all the five generic filtering functions through the selection of inputs.
This topology enjoys cascadability and does not require any additional active element for facilitating the filter realizations.
The same circuit in current-mode has a single input and four outputs and realizes LP, HP and two BP responses simultaneously from which AP and Notch can also be realized. This topology uses grounded resistors and capacitors which are ideal for monolithic integration.
Both the topologies enjoy orthogonal control of natural frequency (ω0) and quality factor (Q) by the grounded resistors. The topologies enjoy low active and passive sensitivity figures. Experimental and PSPICE simulation
results are also included. |
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Keywords: | four terminal floating nullor current feedback amplifier current-mode filters voltage-mode filters cascadability |
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