A Multifunction Filter for Realizing Gain Variable Low-Pass and Band-Pass Responses

Abstract

The second generation current conveyors (CCIIs) as active circuit devices are widely used for designing current-mode (CM) filters. In this paper, a single input multi output filter employing only plus-type CCIIs (CCII+s) and grounded capacitors, and for providing variable gain low-pass and band-pass responses, is suggested. The proposed filter is free from critical passive component matching conditions. Therefore, it is suitable for integrated circuit (IC) technology. Further, developed filter configuration can be easily realized with commercially available active devices such as AD844s. The circuit performance is demonstrated by means of SPICE simulation and experimental test results.

Keywords

• The second generation current conveyor, CCII, Current-mode, Multifunction filter.

Kazanç Değişimli Alçak Geçiren ve Bant Geçiren Cevapları Gerçekleştirmek için Tasarlanan Çok Fonksiyonlu Bir Filtre

Öz

Aktif devre elemanlarından ikinci kuşak akım taşıyıcılar (CCII), akım-modlu filtrelerin tasarımında yaygın olarak kullanılmaktadır. Bu çalışmada, yalnızca artı tipli ikinci kuşak akım taşıyıcıları ve topraklanmış kapasitörler kullanılarak, değişken kazançlı alçak geçiren ve bant geçiren cevaplar sağlayan tek girişli çok çıkışlı filtre devresi önerilmiştir. Önerilen devre, pasif eleman eşleştirme şartından bağımsızdır. Bu nedenle, Entegre Devre Teknolojisi (IC) için uygundur. Ayrıca, geliştirilmiş filtre düzeneği; AD844 gibi mevcut ticari aktif devreler ile kolayca gerçekleştirilebilir. Devre performansı SPICE simülasyonu ve deneysel test sonuçları ile gösterilmiştir.

Anahtar Kelimeler

• The second generation current conveyor, CCII, Current-mode, Multifunction filter.

References

1. Chang, C.M. 1991. Current-Mode All-Pass/Notch and Band Pass Filter Using Single CCII, Electronics Letters, Vol. 27, 16141617.
2. Chang, C. M. 1993. Current-Mode Lowpass, Bandpass and Highpass Biquads Using Two CCIIs, Electronics Letters, Vol. 29, No. 23, pp. 2020-2021.
3. Chang, C.M. 1997. Universal Active Current Filter with Three Inputs and One Output Using Plus Type CCIIs, Electronics Letters, Vol. 33, 1207–1208.
4. Chiu, W. Y. and Horng, J. W. 2007. High-Input and Low-Output Impedance Voltage-Mode Universal Biquadratic Filter Using DDCCs, IEEE Transactions on Circuits and Systems II-Express Briefs, Vol. 54, No. 8, 649-652.
5. Fabre, A. and Alami, M. 1995. Universal Current Mode Biquad Implemented from Two Second Generation Current Conveyors, IEEE Trans. Circuits Syst. Vol. 42, No. 7, 383-385.
6. Fabre, A., Saaid, O., Wiest, F. and Boucheron, C. 1996. High Frequency Applications Based on a new Current Controlled Conveyor, IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, Vol. 43, pp. 82-91.
7. Ferri, G. and Guerrini, N.C. 2003. Low-Voltage Low-Power CMOS Current Conveyors, ISBN: 978-1402074868 London Kluwer Academic Publishers.
8. Sedra, A. S. and Smith, K. C. 1970. A Second Generation Current Conveyor and Its Applications, IEEE Transactions on Circuit Theory, Vol. 17, No. 1, 132-134.

9. Soliman, A. M. 2008. Current-Mode Universal Filters Using Current Conveyors: Classification and Review, Circuits Syst Signal Process, Vol. 27, 405-427.
10. Soliman, A. M. 2009. Current Mode Universal Filters with Grounded Passive Elements and Using Single Output Current Conveyors, J. of Active and Passive Electronic Devices, Vol. 4, 55-62
11. Toumazou, C., Lidgey, F. J. and Haigh, D. G. 1993. Analog IC Design: The Current-Mode Approach, ISBN: 978-0863412974 London: Peter Peregrinus
12. Wang, Z. 1990. 2-MOSFET Transresistor with Extremely Low Distortion for Output Reaching Supply Voltages’, Electronics Letters, Vol. 26, pp. 951-952.
13. Wilson, B. 1990. Recent Developments in Current Conveyors and Current-Mode Circuits, IEE Proceedings Circuits, Devices and Systems, Vol. 137, 63-77
14. Yuce, E. and Minaei, S. 2008. A Modified CFOA and Its Applications to Simulated Inductors, Capacitance Multipliers and Analog filters, IEEE Transactions on Circuits and Systems I- Regular papers, Vol. 55, No. 1, pp. 254-263.