This gaper presents two active gyrator implementations employing only two p
ositive-type current conveyors (CCII+) and an additional buffer, which are
also realisable with two current feedback op-amps (CFOA). The circuits are
constructed using four basic building blocks. One circuit is found to be id
entical to a previously presented circuit, the other is new. An FDNR (frequ
ency-dependent negative resistor) employing only grounded capacitors is rea
lised with the proposed configuration. An application example and simulatio
n results are included to verify the theory. (C) 1998 Elsevier Science Ltd.
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