Ragh Kuttappa

Ragh Kuttappa

Education

Ph.D. in Electrical Engineering, ongoing

Drexel University, Philadelphia, PA, USA

M.S. in Electrical Engineering, 2015

San Francisco State University

Bachelor of Engineering, 2012

Visvesvaraya Technological University (VTU), Karnataka, India

Research Interests

• Resonant clocking technologies
• Adiabatic circuits
• Nanoscale circuits and systems
• Low-power design methodologies

Resonant clocking technologies
Resonant clocking is a low power clock generation and distribution solution for modern ICs. The main research focus is the design and implementation of rotary clocks that is interoperable within the traditional ASIC flow. Based on years of development and experience within Dr. Taskin's research group numerous products for rotary clocks are currently being developed to address future needs for energy efficient computing.

1. RotaSYN: Rotary Traveling Wave Oscillator SYNthesizer

RotaSYN is a backend synthesis tool for rotary clocks. RotaSYN is demonstrated on publicly available designs and compared to traditionally clocked designs. Check out our RotaSYN PAPER published in TCAS-I.

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  RotaSYN Flow
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  AES core synthesized with RotaSYN

2. Robust Low Power Clock Synchronization for Multi-Die Systems

Multi-Die Systems (MDS) have leveraged the high interconnect performance on active and passive interposers to design Network-on-Chips (NoC). However, synchronizing the MDS with a single clocking domain has never been explored. We design a single clocking domain over the active interposer leveraging the high quality interconnect performance, specifically targeting cross-die synchronization. This paper will be presented at ISLPED'19.

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  Active silicon interposer based synchronization topology for multi-die systems with resonant rotary clocks
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  Multi-die system implemented with CORTEX M0 cores and resonant rotary clocks

3. FOPAC: Flexible On-Chip Power and Clock

In this work we propose a novel flexible on-chip power and clock (FOPAC) generation and distribution circuit to enable fast dynamic voltage and frequency scaling (DVFS). To fuse the power and clock design, the multiphase properties of resonant rotary clocks are utilized to design multiphase voltage regulators. We also propose a capacitance reuse technique with the fly cap of switched capacitor voltage regulators to modify the frequency of the global resonant rotary clock at runtime. This paper will appear on TCAS-I.

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  FOPAC Architecture
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  Fast DVFS performance improvements and power savings

Résumé

Ragh Kuttappa (August 2019)

Publications

Journals

1. Ragh Kuttappa, Selcuk Kose, and Baris Taskin, "FOPAC: Flexible On-Chip Power and Clock", IEEE Transactions on Circuits and Systems I: Regular Papers (TCAS-I), Accepted July 2019.
2. Ragh Kuttappa, Adarsha Balaji, Vasil Pano, Baris Taskin, and Hamid Mahmoodi, "RotaSYN: Rotary Traveling Wave Oscillator SYNthesizer", IEEE Transactions on Circuits and Systems I: Regular Papers (TCAS-I), Vol. 66, No. 7, pp. 2685--2698, July 2019.
3. Ragh Kuttappa, Houman Homayoun, Hassan Salmani and Hamid Mahmoodi, "Reliability Analysis of Spin Transfer Torque based Look up Tables under Process Variations and NBTI Aging," Elsevier Microelectronics Reliability Journal, Vol. 62, pp. 156--166, July 2016.

Conferences

1. Vasil Pano, Ragh Kuttappa, and Baris Taskin, "3D NoCs with Active Interposer for Multi-Die Systems", Proceedings of the IEEE/ACM International Symposium on Networks-on-Chip (NOCS), Ocotober 2019.
2. Ragh Kuttappa, Baris Taskin, Scott Lerner, Vasil Pano, and Ioannis Savidis, "Robust Low Power Clock Synchronization for Multi-Die Systems", Proceedings of the ACM/IEEE International Symposium on Low Power Electronics and Design (ISLPED), July 2019.
3. Longfei Wang, Ragh Kuttappa, Baris Taskin, and Selcuk Kose, "Distributed Digital Low-Dropout Regulators with Phase Interleaving for On-Chip Voltage Noise Mitigation", Proceedings of the IEEE International Workshop on System Level Interconnect Prediction (SLIP), June 2019.
4. Ragh Kuttappa, Scott Lerner, Leo Filippini, and Baris Taskin, "Low Swing -- Low Frequency Rotary Traveling Wave Oscillators", Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), May 2019.
5. Ragh Kuttappa and Baris Taskin, "Low Frequency Rotary Traveling Wave Oscillators", Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), May 2018.
6. Ragh Kuttappa, Leo Filippini, Scott Lerner and Baris Taskin, "Stability of Rotary Traveling Wave Oscillators Under Process Variations and NBTI", Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), May 2017, pp. 1--4.
7. Ragh Kuttappa, Lunal Khuon, Bahram Nabet and Baris Taskin, "Reconfigurable Threshold Logic Gates using Optoelectronic Capacitors", Proceedings of the Design, Automation and Test in Europe (DATE), March 2017, pp. 614--617.
8. Ragh Kuttappa, Houman Homayoun, Hassan Salmani and Hamid Mahmoodi, "Comparative Analysis of Robustness of Spin Transfer Torque based Look Up Tables under Process Variations,” Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS), May 2016, pp. 606--609.

Contact Information

Address:
3141 Chestnut Street
Drexel University
ECE Department
Philadelphia, PA 19104

Office: Bossone 405
Email: fr67 [at the rate] drexel [period] edu
Linkedin: ragh/linkedin