On Constant Resistance Filter Design with Dissipative Elements

Abstract

The advantage of constant resistance filters, as compared to active filters, is that any number of such filters can be cascaded - either to sharpen or broaden the response or for designing other kinds of filters, without being sensitive to temperature or other environmental effects. Also, although using lossy elements involves a larger number of components as compared to that using lossless components, the former is a practical design, while the latter is an ideal one and cannot be realized in practice. It is proved here that the circuit for constant resistance filter designed with dissipative elements, proposed earlier in the literature, is a versatile one, in that by properly designing or reorienting, it can perform the functions of a band-pass, band-stop, low-pass as well as high-pass filters.

KEY WORDS:

• Band-pass filter
• Band-stop filter
• Constant resistance filter
• Dissipative elements
• High-pass filter
• Low-pass filter

ACKNOWLEDGMENT

The author thanks Y. V. Joshi for his help in the preparation of this manuscript.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

S. C. Dutta Roy

S C Dutta Roy received his bachelor's, master's and doctorate degrees from the Calcutta University and served the River Research Institute, West Bengal, the University of Kalyani and the University of Minnesota, USA, before joining the Indian Institute of Technology Delhi (IITD). He was with the IITD for more than four decades in various capacities – first, as professor of Electrical Engineering, Head of the Department and Dean of Undergraduate Studies, and after superannuation, as IITD Emeritus Fellow, Indian National Science Academy (INSA) Senior Scientist and INSA Honorary Scientist. He has held visiting professorships at the University of Leeds, UK and the Iowa State University, USA. Currently, he is an INSA honorary scientist working from home with active research interests in circuits, systems and signal processing. Professor Dutta Roy is the recipient of many awards and recognitions, including the Shanti Swarup Bhatnagar Prize, Vikram Sarabhai Award, Pandit Jawaharlal Nehru Award, Fellowship of the IEEE and of all the national academies in science and engineering, and Distinguished Fellowship of the IETE. What he values most, however, is the love and appreciation of his large number of direct as well as virtual (through NPTEL lectures on the internet) students and professional colleagues spread throughout the world. Besides the subjects of his research interests, he maintains a deep interest in Indian Classical Music. Corresponding author. Email: [email protected]