buddypoor
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Hi loose-electron, Hi nxing,
here are some information on current-conveyor (CC) based filters.
* The second generation CC (called CCII) is a current source (output z) with two inputs: positive high resistance: y negative low resistance (<50 ohms): x * Two types: CCII+ and CCII- (depending on output current ditection)
* Commercially available (CCII+): AD844 * Note: The AD844 has also an output buffer on-board; therefore, it can also be used as current-feedback amplifier (CFA) and very often it will be used as such. But the high-impedance node is accessible and the AD844 can be used also as CCII+. * Unfortunately (I don't know why) a lot of publications for CC-filters with the AD844 are called "CFA-based filters", although it is used as CCII+. * Therefore, in case you google for those filters, it is useful to search for "CFA based filters". You can be sure, it is an CC-filter (very often with AD844). * You can find a lot of articles in IEE and IEEE publications as well as in "Int. Journal of Electronics". * Unfortunately, I only have one article available as a pdf file (see attachement). * Some references (out of many): - Comparison of RC opamp and RC current conveyor filters (J.A.Svoboda), Int. J. Electronics, 1994, vol 76, 615-626; - New configuration for single CCII first order and biquadratic current-mode filters (Hou, Wu, Liu), Int. J. Electronics, 1991, vol 71, 637-644; - Application of a commercially available current conveyor (Svoboda, McGory, Webb), Int. J. Electronics, 1991, vol 70, 159-164; - Insensitive voltage-mode and current-mode filters from commercially available transimpedance opamps (Fabre), IEE proceedings-G, 1993, vol 140, 319-321. - Book: The Current mode approach (C. Toumazou) contains a lot of papers dealing with CCII.
* Internet search for "Toumazou" leads you to other relevant links. _____________ All for now. Regards
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