AUTHORS: Hasan Çiçekli, Ahmet Gökçen
Download as PDF
ABSTRACT: This paper introduces a new voltage-mode multifunction filter employing single current differencing transconductance amplifier (CDTA) and its MOS-C implementation. The proposed filter topology can synthesize all filter types, i.e. low-pass, high-pass, band-pass, band-stop and all-pass filters by modifying three admittances and gain of the filters can be adjusted independently by a resistor. Central frequency of the filters can be tuned electronically. The operability of the circuit is confirmed in close agreement with the theory by PSPICE simulation software using TSMC 0.18 micron CMOS model parameters at ±0.9 V supply voltage. The proposed circuit is suitable for integration technique through the MOS-C implementation.
KEYWORDS: Current differencing transconductance amplifier, MOS-C, Multifunction filter, Variable gain
REFERENCES:
[1] D. Biolek, “CDTA-Building block for currentmode analog signal processing”, Proc. of ECCTD’03, Cracow, Poland, 2003. vol. III, pp. 397-400.
[2] A. R. Nasir, S. N. Ahmad, “Current-Mode Single-Input Multi-Outputs Universal Filter Employing CDTAs”, International Journal of Electronics &Communication Technology (IJECT), vol.3, Issue 2, 2012, pp. 14-16.
[3] D. Biolek, V. Biolkova, “CDTA-C currentmode universal 2nd-order filter”, Proc. of 5th WSEAS International Conference on Applied Informatics and Communications, 2005, pp. 411–414.
[4] F. Kaçar, H. Kuntman, “A new, improved CMOS realization of CDTA and its filter applications”, Turkish Journal of Electrical Eng. & Computer Science, vol.19, No.4, 2011, pp.631-642.
[5] J. Jin, C. Wang, “Current mode universal filter and quadrature oscillator using CDTAs”, Turkish Journal of Electrical Eng. & Computer Science, vol. 22, 2014, pp. 276-286.
[6] A. Ü. Keskin, D. Biolek, E. Hancioglu , V. Biolková, “Current-mode KHN filter employing current differencing transconductance amplifiers”, AEU-International Journal of Electronics and Communications, vol. 60, Issue 6, 2006, pp. 443- 446.
[7] M. Somdunyakanok, M. Siripruchyanun, and P. Prommee, “CMOS multiple-output CDTA and its Applications”, Proc. of the 1st International Conference on Technical Education (ICTE2009), 2009, pp. 1-8.
[8] A. R. Nasir, S. N. Ahmad, “Single CDTA Based Current-Mode Universal Filter with grounded Capacitors”, International Journal of Electronics Engineering, vol. 4, Issue 1, 2012, pp. 73– 75.
[9] N. A. Shah, M. Quadri & S. Z. Iqbal, “Realization of CDTA based current-mode universal filter”, Indian Journal of Pure & Applied Physics, vol. 46, 2008, pp. 283-285.
[10] A. Gökçen, “New Possibilities in the Design of Analog Integrated Circuit with MOS-C Realization”, Phd Thesis, Graduate School of Natural and Applied Sciences, Dokuz Eylül University, İzmir, Turkey, 2010.
