Devarshi Das

Research and teaching interests

Analog CMOS IC design
Neuromorphic VLSI circuits and systems
Sensor interfacing circuits
ASICs for bio-signal measurement

About me

I am an Assistant Professor in the Department of Electrical Engineering at the Indian Institute of Technology (IIT) Ropar, India. I have received an M.Tech degree from IIT Delhi in 2010 and a PhD degree from IIT Bombay in 2017. My PhD thesis focused on the design and development of low-power and low-noise analog signal conditioning integrated circuits. My PhD supervisor was Prof. Maryam Shojaei Baghini. From 2010 to 2012, I worked as a Design Engineer in the Advanced Technology Organisation (ATO) lab of General Electric (GE). From 2017 to 2018, I worked as a Lead Research Engineer in the Corporate Technology (CT) group of Siemens. My research interest is multidisciplinary, which includes CMOS integrated circuit design, AI-oriented circuits and systems, neuromorphic electronics, bio-medical instrumentation and sensors interfacing circuits. I have published more than 30 journal/conference papers as author/co-author and have 4 granted patents. I am a senior member of IEEE and also an active reviewer for many reputed journals, including IEEE Journal of Solid State Circuits, IEEE Trans. on Circuits and Systems - 1, IEEE Trans. on Neural Networks and Learning Systems, IEEE Trans. on Biomedical Circuits and Systems, IEEE Trans. on Instrumentation and Measurements, IEEE Sensors Journal, Elsevier Microelectronics Journal, IET Electronics Letters and others. I was awarded as one of the "Outstanding Reviewers of 2019" by the IEEE Transactions on Instrumentation and Measurement Society. I served as the track chair for the Analog and Mixed Signal Design track & the Sensors Circuits and Systems track in VLSID 2022.

Academic background

Ph.D., Indian Institute of Technology Bombay (IIT-B), Mumbai, India (2012-17)
M.Tech., Indian Institute of Technology Delhi (IIT-D), New Delhi, India (2008-10)
B.E., Faculty of Technology, DDU, Nadiad, India (2002-06)

Work experience

Indian Institute of Technology Ropar, Assistant Professor, 2018 - onwards
Siemens, Lead Research Engineer, 2017-18
General Electric, Design Engineer, 2010-12

Courses offered

EE 657 - Mixed-Signal IC Design
GE 108 - Basic Electronics (Theory)
EE 533 - CMOS Analog IC Design
EE 537 - Circuits Simulation Lab
EE 209 - Circuit Theory
EEL 323 - Measurements and Instrumentation
EE 204 - Digital Circuits Lab
GE 108 - Basic Electronics (Lab)

Current Ph.D. scholars

Krishan Mehra (Co-guide: Dr. Mahendra Sakare)
Shivdeep
R. K. Srivastava (Co-guide: Dr. Z. A. Khan, Semi-Conductor Laboratory (SCL), Mohali)
Sahil Sharma (Co-guide: Dr. Vinayak G. Hande, Carinthia University of Applied Sciences, Austria)
Kanupriya Varshney (Guide: Dr. Brajesh Rawat) [IEEE WISC 2022 Scholarship Awardee]
M. A. Saeed (Co-guide: Dr. B. Umapathi, Semi-Conductor Laboratory (SCL), Mohali)
Nidhi (Co-guide: Dr. Vinayak G. Hande, Carinthia University of Applied Sciences, Austria)
Sahibia Kaur Vohra (Co-guide: Dr. Mahendra Sakare)
Sherin A Thomas (Co-guide: Dr. Rohit Sharma)
Mayank Kumar Singh (Guide: Dr. Mahendra Sakare)

Project staff

Dibya Chowdhury

Publications

M. K. Singh, P. Singh, U. Chichhula, H. Mehra, D. M. Das, M. Sakare, "A PRBS Generator using Merged XOR-D flip-flop as Building Blocks", Accepted in Circuits, Systems & Signal Processing (Springer, CSSP), 2023.
Shivdeep, S. Sharma, S. Boyapati, D. M. Das, "A Two Stage Miller OpAmp with Low Voltage Cascode Current Source with High EMI Immunity", Accepted in the IEEE International Symposium and Exhibition on Electromagnetic Compatibility (EMC Europe 2023), Krakow, Poland, 2023.
M. K. Singh, P. Singh, D. M. Das and M. Sakare, "A Low Power Differential Delay Cell without Cross-Coupled Latch for Ring VCO", Accepted in the IEEE 18th International Conference on PhD Research In Microelectronics and Electronics (PRIME 2023), Valencia, Spain, 2023.
S. K. Vohra, S. A. Thomas, Shivdeep, M. Sakare and D. M. Das, "Full CMOS Circuit for Brain-Inspired Associative Memory With On-Chip Trainable Memristive STDP Synapse," in IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2023, doi: 10.1109/TVLSI.2023.3268173.
M. A. Saeed, M. Kumar, B. Umapathi and D. M. Das, "Optimization of Slew Mitigation Capacitor in Passive Charge Compensation based Delta-Sigma Modulator," in IEEE Transactions on Circuits and Systems II: Express Briefs, 2023, doi: 10.1109/TCSII.2023.3234909.
S. A. Thomas, S. K. Vohra, R. Kumar, R. Sharma and D. M. Das, "Analysis of Parasitic Effects in a Crossbar in CMOS Based Neuromorphic System for Pattern Recognition Using Memristive Synapses", in IEEE Transactions on Nanotechnology, Special Section on “Neuromorphic Computing”, 2022, doi: 10.1109/TNANO.2022.3190903.
S. A. Thomas, S. K. Vohra, S. Kushwaha, R. Sharma, D. M. Das, "Modeling and Analysis of CMOS-based Folded Memristive Crossbar Array for 3D Neuromorphic Integrated Circuits", Accepted in the IEEE 73rd Electronic Components and Technology Conference (ECTC), Florida, USA, 2023.
N. Sharma, V. Hande, R. K. Srivastava and D. M. Das, "6-bit 1-GS/s Partially Active Flash ADC with Comparator Offset Correction," 2022 IEEE International Symposium on Smart Electronic Systems (iSES), Warangal, India, 2022, pp. 465-470, doi: 10.1109/iSES54909.2022.00101.
K. Varshney, M. S. Yadav, D. M. Das and B. Rawat, "Performance of Graphene Oxide-based Memristor for Nonvolatile Memory and Neuromorphic Computing," 2022 IEEE International Conference on Emerging Electronics (ICEE), Bangalore, India, 2022, pp. 1-6, doi: 10.1109/ICEE56203.2022.10118104.
S. Chittoriya, Shivdeep, K. K. Jha, D. M. Das and R. Sharma, "A Low-Overhead PUF Based Hardware Security Technique to Prevent Scan Chain Attacks for Industry-Standard DFT Architecture", 2022 IEEE 65th International Midwest Symposium on Circuits and Systems (MWSCAS), 2022, pp. 1-4, doi: 10.1109/MWSCAS54063.2022.9859268.
K. Poojith, K. Varshney, M. S. Yadav, D. M. Das and B. Rawat, "Modulation of Resistive Switching Behaviour of TaOx-based Memristor Through Device Engineering", 2022 IEEE 7th International conference for Convergence in Technology (I2CT), 2022, pp. 1-6, doi: 10.1109/I2CT54291.2022.9824458.
Shivdeep, S. K. Vohra, N. Goel and D. M. Das, "A Robust Training Signal Generator for Trainable Memristive Digital to Analog Converter", 2021 IEEE International Symposium on Smart Electronic Systems (iSES), 2021, pp. 1-5, doi: 10.1109/iSES52644.2021.00014.
S. Kumar and D. M. Das, "Python-LTspice Co-Simulation to Train Neural Networks with Memristive Synapses to Learn Logic Gate Operations", 2021 IEEE International Symposium on Smart Electronic Systems (iSES), 2021, pp. 147-152, doi: 10.1109/iSES52644.2021.00043.
S. K. Vohra, S. A. Thomas, M. Sakare, D. M. Das, "Analytical Modelling of a CMOS Inter Spike Interval Decoder for Resistive Crossbar based Brain Inspired Computing", 25th International Symposium on VLSI Design and Test (VDAT), 2021, pp. 1-4, doi: 10.1109/VDAT53777.2021.9600953.
A. Srivastava, D. M. Das, M. S. Baghini, "Design and Implementation of 0.23 nJ/bit Reference-Spur-Free FSK/OOK Transmitter at 400 MHz for Wearable Health Monitoring", 2021 IEEE Biomedical Circuits and Systems Conference (BioCAS), 2021, pp. 1-5, doi: 10.1109/BioCAS49922.2021.9644937 (selected as one of the top contributions to the conference).
S. K. Vohra, S. Thomas, M. Sakare, D. M. Das, "Full CMOS Implementation of Bidirectional Associative Memory Neural Network with Analog Memristive Synapse", 2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), 2021, pp. 445-448, doi: 10.1109/MWSCAS47672.2021.9531865.
S. A. Thomas, S. K. Vohra, R. Kumar, R. Sharma, D. M. Das, "Analysis of Parasitics on CMOS based Memristor Crossbar Array for Neuromorphic Systems", 2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), 2021, pp. 309-312, doi: 10.1109/MWSCAS47672.2021.9531867.
S. Das, S. Wadhwa, D. M. Das, "A CMOS based High Resolution All-Digital Temperature Sensor with Low Power Supply Sensitivity", 2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), 2021, pp. 137-140, doi: 10.1109/MWSCAS47672.2021.9531828.
M. K. Singh, P. Singh, D. M. Das, M. Sakare, "A low power 8 X 2⁷ - 1 PRBS using Exclusive-OR gate merged D flip-flops", 2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), 2021, pp. 779-782, doi: 10.1109/MWSCAS47672.2021.9531827.
D. M. Das, K. Barot, A. Srivastava, M. S. Baghini, "Noise-power-area optimised design procedure for OTAs with complementary input transistors for neural amplifiers", in IET Circuits, Devices & Systems, vol. 14, no. 5, pp. 702-706, August 2020, doi: 10.1049/iet-cds.2019.0259.
A. Karmakar, D. M. Das, M. S. Baghini, "Adaptive analogue calibration technique to compensate electrode motion artefacts in biopotential recording", in IET Circuits, Devices & Systems, vol. 14, no. 3, pp. 327-332, May 2020, doi: 10.1049/iet-cds.2019.0409.
D. M. Das, A. Vidwans, A. Srivastava, M. Ahmad, S. Vaishnav, S. Dewan and M. Shojaei Baghini, "Design and development of an Internet-of-Things enabled wearable ExG measuring system with a novel signal processing algorithm for electrocardiogram", in IET Circuits, Devices & Systems, vol. 13, no. 6, pp. 903-907, September 2019, doi: 10.1049/iet-cds.2018.5498.
A. Srivastava, D. M. Das, P. Mathur, D. K. Sharma, M. S. Baghini, "0.43-nJ/bit OOK Transmitter for Wearable and Implantable Devices in 400-MHz MedRadio Band", in IEEE Microwave and Wireless Components Letters, vol. 28, no. 3, pp. 263-265, March 2018, doi: 10.1109/LMWC.2018.2800527.
D. M. Das, A. Gupta, A. Srivastava, A. Vidwans, M. Ahmad, A. Shelke, S. Kale, J. Ananthapadmanabhan, D K Sharma, M. Shojaei Baghini, "A pulse oximeter system, OxiSense, with embedded signal processing using an ultra-low power ASIC designed for testability", Elsevier Microelectronics Journal, Volume 72, 2018, Pages 1-10,ISSN 0026-2692, https://doi.org/10.1016/j.mejo.2017.12.001.
B. Chatterjee, N. Modak, A. Amaravati, D. Mistry, D. M. Das, M. S. Baghini, "A Sub-1 V, 120 nW, PVT-Variation Tolerant, Tunable, and Scalable Voltage Reference With 60-dB PSNA", in IEEE Transactions on Nanotechnology, vol. 16, no. 3, pp. 406-410, May 2017, doi: 10.1109/TNANO.2017.2656161.
D. M. Das, A. Srivastava, A. Gupta, K. Barot, M. S. Baghini, "A noise-power-area optimized novel programmable gain and bandwidth instrumentation amplifier for biomedical applications", 2017 IEEE International Symposium on Circuits and Systems (ISCAS), 2017, pp. 1-4, doi: 10.1109/ISCAS.2017.8050955.
A. Srivastava, N. Sankar, D. M. Das, M. S. Baghini, "LNA-LO Co-design Considerations for Low Intermediate Frequency Receivers in 401-406 MHz MedRadio Spectrum for Healthcare Applications", 2017 30th International Conference on VLSI Design and 2017 16th International Conference on Embedded Systems (VLSID), 2017, pp. 175-180, doi: 10.1109/VLSID.2017.18.
D. M. Das, A. Srivastava, J. Ananthapadmanabhan, M. Ahmad, M. S. Baghini, "A novel low-noise fully differential CMOS instrumentation amplifier with 1.88 noise efficiency factor for biomedical and sensor applications", Elsevier Microelectronics Journal, Volume 53, 2016, Pages 35-44, ISSN 0026-2692, https://doi.org/10.1016/j.mejo.2016.04.008. (One of the most downloaded papers in 2016)
A. Srivastava, N. Sankar K., B. Chatterjee, D. M. Das, M. Ahmad, Rakesh K. K., V. Saraf, J. Ananthapadmanabhan, D. K. Sharma, M. S. Baghini, "Bio-WiTel: A Low-Power Integrated Wireless Telemetry System for Healthcare Applications in 401–406 MHz Band of MedRadio Spectrum", in IEEE Journal of Biomedical and Health Informatics, vol. 22, no. 2, pp. 483-494, March 2018, doi: 10.1109/JBHI.2016.2639587.
A. Srivastava, D. M. Das, M. S. Vignesh, K. Bharadwaj, S. Dewan and M. S. Baghini, "Bio-telemetry and bio-instrumentation technologies for healthcare monitoring systems", 2016 IEEE Region 10 Humanitarian Technology Conference (R10-HTC), 2016, pp. 1-6, doi: 10.1109/R10-HTC.2016.7906827.
A. Srivastava, D. M. Das, D. K. Sharma, M. S. Baghini, "SAW resonator oscillator based injection locked OOK transmitter for MedRadio spectrum", 2016 14th IEEE International New Circuits and Systems Conference (NEWCAS), 2016, pp. 1-4, doi: 10.1109/NEWCAS.2016.7604804.
P. Kimtee, D. M. Das, M. S. Baghini, "A mismatch insensitive reconfigurable discrete time biosignal conditioning circuit in 180 nm MM CMOS technology", 2016 20th International Symposium on VLSI Design and Test (VDAT), 2016, pp. 1-2, doi: 10.1109/ISVDAT.2016.8064907.
A. Srivastava, N. Sankar, K. K. Rakesh, B. Chatterjee, D. M. Das, M. S. Baghini, "Design and measurement techniques for a low noise amplifier in a receiver chain for MedRadio spectrum of 401–406 MHz frequency band", 2016 20th International Symposium on VLSI Design and Test (VDAT), 2016, pp. 1-6, doi: 10.1109/ISVDAT.2016.8064846.
D. M. Das, J. Ananthapadmanabhan, M. S. Baghini, D. K. Sharma, "Design considerations for high-CMRR low-power current mode instrumentation amplifier for biomedicai data acquisition systems", 2014 21st IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2014, pp. 251-254, doi: 10.1109/ICECS.2014.7049969.
B. Subrahmanyam, D. M. Das, M. S. Baghini and J. Redoute, "A balanced CMOS OpAmp with high EMI immunity", 2014 International Symposium on Electromagnetic Compatibility, 2014, pp. 703-708, doi: 10.1109/EMCEurope.2014.6930995.

Patents

Inventor in a patent filed on ultra low noise instrumentation amplifier.
Co-inventor in a patent filed on handheld pulse oximeter recording and analysis system.
Co-inventor in a patent filed on a design method for low-power and low-noise bio-medical signal conditioning circuit. [Patent no. 408593; Granted on 07-October-2022.]
Co-inventor in a patent filed on voltage mode log domain low-pass filter. [Patent no. 398460; Granted on 02-June-2022.]
Co-inventor in a patent filed on SAW resonator oscillator based injection locked OOK transmitter for health care applications in MedRadio spectrum (401-406 MHz). [Patent no. 381814; Granted on 15-Nov-2021.]
Co-inventor in a patent filed on design considerations for transmitter and receiver for personal health care applications. [Patent no. 408641; Granted on October-2022.]

Technical/Administrative activities

Ranking Committee Member (Oct. 2022 - onwards)
Ph.D (VLSI) coordinator (Feb. 2021 - onwards)
Faculty advisor: 1) EE 2019 UG batch; 2) M.Tech (VLSI) 2020 batch
Track Chair for Analog and Mixed-Signal Design, International VLSI Design (VLSID) Conference 2022 and 2023
Invited TPC member: IEEE-iSES 2019 onwards, VDAT 2022
Reviewer: IEEE Trans. Circuits and Systems - 1, IEEE Trans. on Instrumentation and Measurements, IEEE Trans. on Neural Networks and Learning Systems, IEEE Trans. on Biomedical Circuits and Systems, IEEE Systems Journal, Elsevier Microelectronics Journal, Elsevier Sensors and Actuators, and others.

Invited Talks

Short-term course on Analog and Digital VLSI Design at National Institute of Technical Teacher Training and Research (NITTTR), Chandigarh (Sept., 2021)
ReAp@CVEST-2020, 1-day workshop at IIIT Hyderabad (Oct., 2020)
APJ Abdul Kalam Faculty Lecture Series at IIT Ropar (Oct., 2020)

Awards and Honors

2019 IEEE Trans. on Instrumentation and Measurements Outstanding Reviewer. (Feb. 2020)
IEEE ISCAS 2017 - Student Travel Grant. (May 2017)
SERB International Travel Support (ITS). (May 2017)
TCS fellowship through VLSI Design Lab, IIT Bombay. (September 2016 - May 2017)
Research sponsorship from Ministry of Electronics and Information Technology(MeitY), Govt. of India. (July 2012- August 2016)
Scholarship from Ministry of Human Resource Development (MHRD), Govt. of India for post-graduate studies. (2008-2010)

MTP Students

Achintya Kumar Saha (2023-24)
Tanuja Lohani (2023-24)
Shivangi Gupta (2022-23) [Joined Synopsis]
Mayuri (2022-23) [Joined Synopsis]
Jateen Dalbehera (2021-22) [Joined Intel]
Soumyashib Das (2020-21) [Joined NXP Semiconductors]
Dulumoni Pegu (2020-21) [Joined Cadence Design Systems]

BTP Students

Anish Shelgaokar (2022-23) [Joined Analog Devices.]
Varun Sharma (2021-22) [Joined Texas Instruments.]
Aman Kumar (2021-22) [Joined CoinDCX.]
Mitali Rathod (2020-21) [Joined Ceremorphic. Currently at Nvidia.]
Nikhil Jain (2020-21) [Joined SignalChip. Currently at Texas Instruments.]
Shreshtha Gothalyan (2019-20) [Joined HPCL.]
Anil Kumar Panda (2018-19) [Joined M.Tech. program at IITK.]
Gaurav Kamila (2018-19) [Joined M.Tech. program at IITB. Currently in MediaTek, Taiwan.]

Contact

Email: firstname.lastname@iitrpr.ac.in