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


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.


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