Subthreshold Low-Transconductance M-CDTA based Low Frequency Current Mode Universal Filter

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2020 by IJETT Journal
Volume-68 Issue-5
Year of Publication : 2020
Authors : Varun Bhanoo, Ashmin Gangal, Neeta Pandey
DOI :  10.14445/22315381/IJETT-V68I5P204S


MLA Style: Varun Bhanoo, Ashmin Gangal, Neeta Pandey  "Subthreshold Low-Transconductance M-CDTA based Low Frequency Current Mode Universal Filter" International Journal of Engineering Trends and Technology 68.5(2020):16-22. 

APA Style:Varun Bhanoo, Ashmin Gangal, Neeta Pandey. Subthreshold Low-Transconductance M-CDTA based Low Frequency Current Mode Universal Filter  International Journal of Engineering Trends and Technology, 68(5),16-22.

In this research work, a low transconductance Modified Current Differencing Trans-Conductance Amplifier (M-CDTA) block customized to operate in the sub-threshold region of operation is presented. It is able to achieve a low transconductance value, with the minimum value being 68.8nA/V. As an application, a low frequency current mode universal filter is presented in this manuscript which is used in biomedical signal processing. The structure is composed of two M-CDTA blocks along with two grounded capacitors. The grounded capacitors make the circuit feasible from a fabrication point of view. The circuit has low input as well as high output impedances, which is as desired in a current mode (CM) circuit. The filter also possesses benefits such as electronically tunability of the pole frequencies using bias currents and orthogonal tunability of the pole frequency and the quality factor of the filter. Both the block and the filterare developed on CMOS 180nm technology node. The functionality of the circuit is simulated and verified on Cadence Virtuoso software. The simulation results reveal a good performance of the implemented block as well as the filter.


[1] D. Biolek, “CDTA-building block for current-mode analog signal processing,” In Proceedings of the ECCTD, vol. 3, pp. 397-400, 2003.
[2] A. A. Fedotov, "Selection of parameters of bandpass filtering of the ECG signal for heart rhythm monitoring systems," Biomedical Engineering, vol. 50, no. 2, pp. 114-118, 2016.
[3] P. Prommee, T. Pattanatadapong, K. Angkeaw and M. Somdunyakanok, “Low-Input Impedance CMOS MO-CDTA and its Universal Filter Application,” In ITC-CSCC, p. 931, 2010.
[4] J. Jin and C. Wang, “Current-mode universal filter and quadrature oscillator using CDTAs,” Turkish Journal of Electrical Engineering & Computer Sciences, vol. 22, no. 2, pp. 276-286, 2014.
[5] M. Somdunyakanok, M. Siripruchyanun and P. Prommee, “CMOS multiple-output CDTA and its Applications,” In Proc. 1st Int. Conf. Technical Education, pp. 184-187, 2009.
6] T. Dumawipata, W. Tangsrirat and W. Surakampontorn, “Cascadable current-mode multifunction filter with two inputs and three outputs using CDTAs,” In 6th International Conference on Information, Communications & Signal Processing, pp. 1-4, 2007.
[7] T. Dumawipata, W. Tangsrirat and W. Surakampontorn, “Current-mode universal filter with four inputs and one output using CDTAs,” In 2006 IEEE Asia Pacific Conference on Circuits and Systems, pp. 892-895, 2006.
[8] D. Biolek and V. Biolková, “CDTA-C current-mode universal 2nd-order filter,” In Proceedings of the 5th WSEAS International Conference on Applied Informatics and Communications, pp. 411-414, 2005.
[9] M. Kumngern and K. Dejhan, “Current-mode multifunction biquad filter with three inputs five outputs using ZC-CDTAs,” In 2012 Second International Conference on Digital Information and Communication Technology and it`s Applications (DICTAP), pp. 309-313, 2012.
[10] M. Kumngern, K. Khwama and S. Junnapiya, “Three-input single-output current-mode universal filter using a MCDTA,” In 2013 Eleventh International Conference on ICT and Knowledge Engineering, pp. 1-4, 2013.
[11] N.A. Shah, M. Quadri and S.Z. Iqbal, “Realization of CDTA based current-mode universal filter,” Indian Journal of Pure and Applied Physics, vol. 46, pp. 283-285, 2008.
[12] J. Jin, “Resistorless active SIMO universal filter and four-phase quadrature oscillator,” Arabian Journal for Science and Engineering, vol. 39, no. 5, pp. 3887-3894, 2014.
[13] A.R. Nasir and S.N. Ahmad, “Single CDTA based current-mode universal filter with grounded capacitors,” International Journal of Electronics Engineering, 4, pp. 73-75, 2012.
[14] W. Tangsrirat, T. Dumawipata and W. Surakampontorn, “Multiple-input single-output current-mode multifunction filter using current differencing transconductance amplifiers,” AEU-International Journal of Electronics and Communications, vol. 61, no. 4, pp. 209-214, 2007.
[15] D. Biolek and V. Biolkova, “Universal biquads using CDTA elements for cascade filter design,” Proceeding of the CSCC, pp. 232-236, 2003.
[16] D. Prasad, D.R. Bhaskar and A.K. Singh, “Universal current-mode biquad filter using dual output current differencing transconductance amplifier,” AEU-International Journal of Electronics and Communications, vol. 63, no. 6, pp. 497-501, 2009.
[17] A. Uygur, H. Kuntman and A. Zeki, “Multi-input multi-output CDTA-based KHN filter,” In Proc. of ELECO: The 4th International Conference on Electrical and Electronics, pp. 46-50, 2005.
[18] S. Summart and C. Thongsopa, “CDTAs Based Current-Mode Universal Biquad Filters with Orthogonal Control of Quality Factor and Pole Frequency,” In Advanced Materials Research, vol. 787, pp. 501-507, 2013.
[19] M. Kumngern and U. Torteanchai, “Four-input four-output current-mode multifunction filter using CDTAs,” In 2017 2nd International conferences on Information Technology, Information Systems and Electrical Engineering (ICITISEE), pp. 436-439, 2017.

CDTA, Low-Transconductance, Subthreshold Regime, Universal Filter.