Signal Flow Graph Synthetical Implement the Current-Mode Multifunction Filter Based on CDTA

Abstract:

In this paper, a signal flow graph structure of current-mode multifunction filter using current differencing transconductance amplifier (CDTA) is presented. The proposed configuration is comprised of two grounded capacitors and four CDTAs. They exhibit low-input and high-output impedances, which is very convenient for integrated circuit implementation. The presented filter configuration can realize all the standard filter functions simultaneously, lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP), without any component matching conditions. The natural frequency () and the bandwidth () of the proposed filter can be electronically tuned by varying the bias current of the CDTA. PSPICE simulation results are included to confirm the theory.

• Periodical: Applied Mechanics and Materials (Volumes 530-531)
• Pages: 1100-1107
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.530-531.1100
• Online since: February 2014
• Authors: Hai Zhen He, Jun Kuang, Xin Liu, Xin Hang Huang, Mei Li Cao
• Keywords: Current Differencing Transconductance Amplifier (CDTA), Current Mode, Multifunction Filter, Signal Flow Graph

References

[1] Biolek D. CDTA—building block for current-mode analog signal processing. Proceedings of the ECCTD'03 , Krakow, Poland, vol. III, 2003; 397–400.

[2] Keskin AU, Biolek D, Hancioglu E, Biolkova V. Current-mode KHN filter employing current differencing transconductance amplifiers. Int J Electron Commun (AEU) 2006; 60: 443–6.

DOI: 10.1016/j.aeue.2005.09.003

[3] Uygur A, Kuntman H, Zeki A. Multi-input multi-output CDTA-based KHN filter, In: Proceedings of the ELECO 2005: the fourth international conference on electrical and electronics, Bursa, Turkey, 2005. p.46–50.

[4] W. Tangsrirat, T. Dumawipata and W. Surakampontorn, Multiple-input single-output current-mode multifunction filter using current differencing transconductance amplifiers. AEU–Int J Electron Commun, 61 4 (2006), p.209–214.

DOI: 10.1016/j.aeue.2006.04.004

[5] A. Uygur, H. Kuntman, Seventh order elliptic video filter with 0. 1dB pass band ripple employed CMOS CDTAs, AEU: International Journal of Electronics and Communications, Vol. 61, 320-328, (2007).

DOI: 10.1016/j.aeue.2006.06.002

[6] F. anday, Realization of Transfer Functions Using Differential-Input Operational Amplifiers. Proceedings of the IEEE, Vol. 60, 445 – 446, (1972).

DOI: 10.1109/proc.1972.8652

[7] Biolek, D. Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on. 1058 - 1061 vol. 2, 13-16 Aug (1995).

[8] Guzinski, M. Signal flow graph structure of high-pass filter useful for OTA-C. Circuits and Systems, 1996., IEEE 39th Midwest symposium on. 929 - 932 vol. 2, 18-21 Aug (1996).

DOI: 10.1109/mwscas.1996.588091

[9] Biolek D, Biolkova V. Universal biquads using CDTA elements for cascade filter design. In: Proceedings of the CSCC 2003 Corfu, Greece, 2003, ISBN 960-8052-82-3 (CD).

[10] Kerwin, W.J., Huelsman, L.P., Newcomb, R.W. Solid-State Circuits, IEEE Journal of, Vol. 2 87 – 92, (1967).

DOI: 10.1109/jssc.1967.1049798

[11] D.R. Frey, Log-domain filtering: an approach to current-mode filtering, IEE Proc. G Circuits, Devices and Systems, vol. 140, pp.406-416, (1993).

DOI: 10.1049/ip-g-2.1993.0066