Abstract
The strategy of improving the group delay in analog filters through the modification of conventional characteristic polynomials is a concept reported in advanced filter design literature. However, at present, this idea has only been approached from a theoretical perspective, validated by numerical or electrical simulations but not experimentally verified. This paper is precisely devoted to exploring the viability of physically realizing this idea. Because most of the references that deal with this topic consider the case of Chebyshev filters, this type of filters is also considered in our experimental validation. In our proposal, a synthesis based on FDNR topology (frequency-dependent negative resistor) is preferred over other circuit design strategies due to its low sensitivity. In order to verify the physical realization capability of this type of filter, the experimental results of a fifth-order Chebyshev filter implemented by using commercially available JFET op-amps TL082 are reported. In this case study, the frequency (magnitude and group delay) and time (step) responses of the conventional filter are contrasted with those of the modified filter, demonstrating that the experimental results accord with the theoretical background.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Choi, S. W., Kim, D. Y., & Kim, H. K. (1994). A modified low-pass filter with progressively diminishing ripples. Analog Integrated Circuits and Signal Processing,. https://doi.org/10.1109/CCECE.2000.849544.
Baez-Lopez, D., & Jimenez-Fernandez, V. (2000). Modified Chebyshev filter design. In Canadian conference on electrical and computer engineering. https://doi.org/10.1109/CCECE.2000.849544.
Sengul, M. (2013). Shifted-modified Chebyshev filters. Turkish Journal of Electrical Engineering & Computer Sciences,. https://doi.org/10.3906/elk-1112-26.
Baez-Lopez, D., & Jimenez-Lopez, E. (1999). A modified inverse-Chebyshev filter with an all positive elements ladder passive realization. In International Symposium on Circuits and Systems https://doi.org/10.1109/ISCAS.1999.780092.
Jimenez-Fernandez, V. M. (2000). Modified Chebyshev filter synthesis. Master’s dissertation, Fundación Universidad de las Américas Puebla.
Sedra, A. S., & PP, Brackett. (1978). Filter theory and design: Active and passive. New Delhi: Matriz Publishers.
Temes, G. C., & Lapatra, J. W. (1977). Introduction to circuit synthesis and design (networks and systems). New York: McGraw Hill Higher Education.
Huelsman, L. P. (1993). Active and passive analog filter design. New York: McGraw Hill.
Fisher, T. LC filter design. University of York. Retrieved August 8, 2018 fromhttps://www-users.cs.york.ac.uk/~fisher/lcfilter/.
Frank, A. C., & Changpuak, A. Chebyshev lowpass filter designer. Retrieved June 29, 2018 fromhttp://www.changpuak.ch/electronics/chebyshev_lowpass.php.
Pease, R. (2008). Analog circuits. Oxford: Newnes.
Zumbahlen, H. (2007). Basic linear design. Norwood: Analog Devices.
Pactitis, S. A. (2007). Active filters, theory and design. London: Taylor & Francis.
Acknowledgements
The authors wish to thank lng. Napoleón Velasco for the helpful assistance in the analog electronic laboratory during the measurement data phase.
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Jimenez-Fernandez, V.M., Sevilla-Angel, J.M., Vazquez-Leal, H. et al. Experimental validation of analog Chebyshev filters with improved group-delay. Analog Integr Circ Sig Process 100, 287–294 (2019). https://doi.org/10.1007/s10470-019-01490-2
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10470-019-01490-2