Abstract
The comment is related to the recently published paper given in [1] dealing with the implementation of series and parallel R-L and C-D impedances using a single differential voltage current conveyor (DVCC). Nevertheless, straightforward analysis of the circuit in Fig. 3(b) of [1] and also given in Fig. 1 shows that it has a problem because it makes its input voltage V in = 0. Therefore, it can not realize parallel (–L)–(–R) simulator as claimed in [1].
Alternatively, a circuit given in Fig. 2 for realizing parallel (–L)–(–R) simulator employing a single minus-type DVCC (DVCC–) and a minimum number of passive components is proposed. The introduced circuit employs a grounded capacitor, and requires no critical component matching constraints thus it is suitable for fully integrated circuit technology. If plus-type DVCC (DVCC+) is replaced instead of the DVCC–, this proposed simulator can realize parallel (L)–(R) simulator.
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Reference
M. Incekaraoglu and U. Çam, “Realization of series and parallel R-L and C-D impedances using single differential voltage current conveyor.” Analog Integrated Circuits and Signal Processing, vol. 43, pp. 101–104, 2005.
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Yuce, E. Comment on “realization of series and parallel R-L and C-D impedances using single differential voltage current conveyor”. Analog Integr Circ Sig Process 49, 91–92 (2006). https://doi.org/10.1007/s10470-006-8859-1
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DOI: https://doi.org/10.1007/s10470-006-8859-1