Abstract
This paper proposes a mixed-mode time delay circuit using the current feedback operational amplifiers, passive resistors, and capacitors. The circuit can generate specified time delay in all four modes of operation namely voltage mode, current mode, transimpedance mode, and transconductance mode. Tuning is possible by either varying a particular resistor or a particular capacitor. The proposed design provides for a very high slew rate and gain-bandwidth decoupling resulting in overcoming the limitations on maximum operating frequency range as seen in the case of operational amplifiers. Padé approximant technique is used for the rational approximations of function, hence, converting the irrational time delay function into a polynomial in ‘s’. A single circuit implementing all four modes of operation requiring 6 current feedback operational amplifiers, a switch, and other passive components has been proposed. Cadence OrCAD capture simulations and hardware results confirm the validity and practical utility of the proposed circuits.
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Acknowledgements
We are grateful to Prof. (Dr.) Pragati Kumar for providing his ideas, unmatched guidance, and inevitable advice during the development of the presented paper. All the hardware results have been carried out at the Linear Integrated Circuits (LIC) laboratory at Delhi Technological University (DTU). We also thank all other people who gave their input directly or indirectly during the development of the paper.
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Sau, A., Puri, P.S., Gupta, A. (2021). Mixed-Mode Time Delay Circuit Using CFOA. In: Mallick, P.K., Bhoi, A.K., Marques, G., Hugo C. de Albuquerque, V. (eds) Cognitive Informatics and Soft Computing. Advances in Intelligent Systems and Computing, vol 1317. Springer, Singapore. https://doi.org/10.1007/978-981-16-1056-1_42
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