Ranjan Tiwari
Ph.D., IIT Roorkee, UttarakhandAssistant Professor, School of Engineering
Ranjan Tiwari
Ph.D., IIT Roorkee, UttarakhandMy research quest is on advancing frequency-domain sensing techniques for precise and scalable measurement of electrical parameters, particularly resistance and capacitance. I am driven by the need to overcome the inherent limitations of conventional time-domain measurement approaches, such as susceptibility to noise, limited dynamic range, and reduced sensitivity in low-signal conditions. My work focuses on leveraging spectral methods to extract meaningful information from signals with improved robustness and resolution.
A key component of my research involves the development of efficient algorithms based on the Sliding Discrete Fourier Transform (SDFT) and Frequency-Locked Loop (FLL) architectures. I explore how kernel-windowed SDFT techniques can be optimized to enhance frequency selectivity while maintaining computational efficiency suitable for real-time implementation. By integrating these methods with FLL-based tracking, I aim to design sensing systems capable of continuously monitoring variations in impedance with high accuracy and stability.
I am particularly interested in translating these algorithms into hardware-efficient architectures using FPGA platforms. This includes the design of fixed-point implementations, resource-optimized pipelines, and high-speed data acquisition interfaces. My goal is to bridge the gap between theoretical signal processing models and deployable embedded systems, ensuring that advanced sensing techniques can be realized in practical applications such as biomedical instrumentation, industrial monitoring, and environmental sensing.
Another important aspect of my research quest is the co-design of analog front-end circuits with digital signal processing back-ends. I investigate how excitation signal design, noise shaping, and calibration strategies can be jointly optimized with frequency-domain algorithms to achieve superior system-level performance.
Ultimately, my vision is to contribute to the development of intelligent, adaptive sensing systems that operate reliably in complex and dynamic environments. I seek to push the boundaries of frequency-domain analysis and create solutions that are not only theoretically sound but also practically impactful in next-generation sensing technologies.
Ranjan Tiwari has been a part of Chanakya University’s School of Engineering since Dec 2025. He has more than six years of academic and research experience. His research interests span designing interfacing circuits for capacitive and resistive sensors, FPGA programming, FLL design, frequency estimation, signal processing, DFT techniques, sensor design, and Kernel windowing in SDFT.
He received his M. Tech degree from the NIT Hamirpur and completed his PhD in Electrical Engineering from IIT Roorkee.
Dr. Tiwari’s research contributions are published in leading peer-reviewed journals, primarily IEEE Transactions on instrumentation and measurement and IEEE sensors journal. He has presented his work at several national conferences, supported by fundings from MHRD. He also received travel grant to present his work at IEEE INDICON 2022 conference held at Kochi, Kerela, INDIA.
- Ph.D., Electrical Engineering (Instrumentation and Signal processing), 2026, IIT Roorkee, Uttarakhand
- M.Tech., Electrical Engineering (Signal Processing and Control), 2015, NIT Hamirpur, Himachal Pradesh
- B.Tech., Electronics and Telecommunication Engineering, 2012, CSVTU Bhilai, Chhattisgarh
Journal Articles
- R. Tiwari and P. Sumathi, “Parzen-windowed SDFT Based Frequency Tracking Approach for Sensing Capacitance and Resistance” IEEE Transactions on Instrumentation and Measurement. Vol. 75, pp. 1-12, 2026.
- R. Tiwari and P. Sumathi, “Windowed Sliding DFT Structure for Integrated Resistance and Capacitance Sensing with Wider Sensing Range,” IEEE Transactions on Instrumentation and Measurement. Vol. 74, pp. 1-11, 2025.
- R. Tiwari and P. Sumathi, “Kernel-Windowed SDFT Based Frequency-Locked Loop for Capacitance Sensing on an FPGA,” IEEE Sensors Journal., vol. 22, no. 14, pp. 14205-14216, July 2022.
Conference Proceedings
- R. Tiwari and P. Sumathi, “Improved Dual Measurement System based on SDFT-FLL with High Accuracy,” Proc. 7th IEE International Conference (CERA), pp. 1-5, 2023.
- R. Tiwari and P. Sumathi, “Kernel-Windowed SDFT Based Temperature Measurement System,” Proc. 19th IEEE India Conf. (INDICON), pp. 1-5, Nov. 2022.
Project 1: Worked as JRF
- Title: Field Deployable Signal Processing System for measurement of Path integrated gas concentration in real-time.
- Duration: 1 years
- Granting Agency: DRDO, New Delhi, Gov. of India.
- PIs/Co PIs: Dr. P. Sumathi, Dr. Vinod Kumar, IIT Roorkee
- Purpose: To develop advanced fire detection system for critical infrastructure.
- Status: Completed
- Grant Amount: 18.97 Lacs.
Project 2: Worked as Research Associate
- Title: Integrated resistance and capacitance measurement system based on field programmable gate array.
- Duration: 3 years
- Granting Agency: CSIR, New Delhi, Gov. of India
- PIs/Co PIs: Dr. P. Sumathi, IIT Roorkee
- Purpose: To develop single measurement system for dual resistive and capacitive measurement applications.
- Status: Completed
- Grant Amount: 28.67 Lacs.
- Qualified GATE 2013 (98 percentile out of 2,56,135 candidates).
- Received TEQIP II fellowship to pursue Masters Studies at NIT Hamirpur.
- Selected for Assistant Professorship role in 2018 under TEQIP III project implemented by MHRD, New Delhi.
- Received travel grant to present conference paper at IEEE INDICON 2022 held at Kochi, Kerela, INDIA.
- Attended ten-day INUP i2i Hands-on training on Nanofabrication and Characterization held in Aug-Sept 2024 at IIT Kharagpur.
- Attended five-day Workshop on “Scientific Computing with Python for Electrical Engineers” in Feb 2019 at IIT Bombay.
- Attended Five Day Summer Training program on “Advanced pedagogy and Digital Tool” in May 2019 at IIT Gandhinagar.
- Organized and Attended Three Day workshop on “Outcome-based Education and Accreditation” in March 2019 held at Chaibasa Engineering College in Collaboration with NIT Warangal.
- Participated in three day TEQIP III professional development program for Senior academic cum administrative executives held in June 2019 at IIM Shillong.
- Beyond academia, Dr. Tiwari is passionate about travelling, photography and watching documentaries.