World Academy of Science, Engineering and Technology
Published October 24, 2011 | Version 13868
Journal article Open

Realization of Electronically Controllable Current-mode Square-rooting Circuit Based on MO-CFTA

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This article proposes a current-mode square-rooting circuit using current follower transconductance amplifier (CTFA). The amplitude of the output current can be electronically controlled via input bias current with wide input dynamic range. The proposed circuit consists of only single CFTA. Without any matching conditions and external passive elements, the circuit is then appropriate for an IC architecture. The magnitude of the output signal is temperature-insensitive. The PSpice simulation results are depicted, and the given results agree well with the theoretical anticipation. The power consumption is approximately 1.96mW at ±1.5V supply voltages.

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References

  • O. E. Doebelin, Measurement Systems: Application and Design, New York: McGraw Hill, 2004.
  • S.-I. Liu, "Square-rooting and vector summation circuits using current conveyors," IEE Proc. Circuit., Dev. Syst., vol.142, pp. 223-226. 1995.
  • V. Riewruja, "Simple square-rooting circuit using OTAs," Electronics Letters, vol. 44, pp.1000-1002, 2008.
  • C. Netbut, M. Kumngern, P. Prommee and K. Dejhan, "New simple square-rooting circuits based on translinear current conveyors," ECTI Transactions on Electrical Eng., Electronics, and Communication, vol. 5, 10-17, 2007.
  • D. R. Bhaskar, V. K. Sharma, M. Monis and S. M. I. Rizvi, "New current-mode universal biquad filter," Microelectronics Journal, vol. 30, pp. 837-839, 1999.
  • C. Toumazou, F. J. Lidgey and D. G. Haigh. Analogue IC design: the current-mode approach, London: Peter Peregrinus, 1990.
  • H. Schmid, "Why the terms ÔÇÿcurrent mode- and ÔÇÿvoltage mode- neither divide nor qualify circuits," IEEE ISCAS, pp. II-29-II-32, 2002.
  • S. Khucharoensin, and V Kasemsuwan, "High performance CMOS current-mode precision full-wave rectifier," IEEE ISCAS, pp. I-41-I-44, 2003.
  • N. Herencsar, J. Koton, I. Lattenberg, and K. Vrba, "Signal-flow graphs for current-mode universal filter design using current follower transconductance amplifiers (CFTAs)," In Proceedings of the Applied Electronics - APPEL-08, Pilsen, Czech Republic, pp. 113-116, 2008. [10] D. Biolek, R. Senani, V. Biolkova, and Z. Kolka, "Active elements for analog signal processing: classification, review, and new proposals," Radioengineering, vol. 17, no. 4, pp. 15-32, 2008. [11] D. R. Frey, "Log-domain filtering: an approach to current-mode filtering", IEE Proceedings of Circuit Devices Systems, vol.140, pp. 406-416, 1993..