Harish Krishnaswamy


1300 S.W. Mudd
Mail Code: 4712

Tel(212) 854-8196
Fax(212) 932-9421

Harish Krishnaswamy conceives, analyzes, designs, and experimentally demonstrates novel integrated electronic technologies for new high-frequency wireless applications. He has worked on integrated full-duplex radios that can simultaneously transmit and receive on the same frequency band, thereby doubling network capacity. He has investigated temporally-modulated circuits that break the traditional physical laws of reciprocity, enabling the realization of integrated non-reciprocal components such as isolators and circulators without the need for magnetic materials. He has also worked on integrated MIMO radios that use multiple antennas to achieve significant increase in data throughput.

Research Interests

Integrated full duplex radios, Integrated MIMO radios, Integrated millimeter-wave radios, Non-reciprocal circuits and metamaterials, Integrated electro-optical systems

He has also made significant contributions to high-power and energy-efficient millimeter-wave circuits and systems. These technologies are all of significant interest for the next generation of wireless networks (the highly anticipated “5G”). He directs the Columbia high-Speed and Millimeter-wave IC (CoSMIC) lab, where students participate in a multi-disciplinary scientific endeavor that explores synergies between the physical layer (integrated electronics) and higher layers (communication systems and networking) on the one hand, and electronics and applied physics/electromagnetics on the other.

Krishnaswamy received a B. Tech. in electrical engineering from Indian Institute of Technology - Madras in 2001, and a PhD in electrical engineering from the University of Southern California in 2009.   

Professional Experience

  • Associate professor of electrical engineering, Columbia University, 2015–present
  • Assistant professor of electrical engineering, Columbia University, 2009–2014

Professional Affiliations

  • Institute of Electrical and Electronics Engineers

Honors & Awards

  • DARPA Microelectronics Exploratory Council Member.
  • 2017-2019 IEEE SSCS Distinguished Lecturer.
  • 2018 IEEE RFIC Symposium Best Student Paper Award.
  • 2018 IEEE ISSCC Best Demo Award.
  • 2015 IEEE RFIC Symposium Best Student Paper Award.
  • 2014 IBM Faculty Award.
  • 2011 DARPA Young Faculty Award.
  • USC Viterbi School of Engineering 2009 Best Thesis Award – Experimental Research Category.
  • IEEE International Solid-State Circuits Conference (ISSCC) 2007 Lewis Winner Award for Outstanding Paper.

Selected Publications

  • Tolga Dinc, Mykhailo Tymchenko, Aravind Nagulu, Dimitrios Sounas, Andrea Alu and Harish Krishnaswamy, “Synchronized Conductivity Modulation to Realize Broadband Lossless Magnetic-Free Non-Reciprocity,” Nature Communications, vol .8, no. 795, Oct. 6, 2017.
  • Ritesh Bhat, Jin Zhou and Harish Krishnaswamy, “Wideband Mixed-Domain Multi-Tap FIR Filtering of OOB Noise Floor in Watt-Class Digital Transmitters,” (invited paper) IEEE Journal of Solid-State Circuits, vol. 52, no. 12, pp. 3405-3420, Dec. 2017.
  • Linxiao Zhang and Harish Krishnaswamy, “Arbitrary Analog/RF Spatial Filtering in Digital MIMO Receiver Arrays,” (invited paper) IEEE Journal of Solid-State Circuits, vol. 52, no. 12, pp. 3392 – 3404, Dec. 2017.
  • Tolga Dinc, Aravind Nagulu and Harish Krishnaswamy, “Millimeter-wave Non-Magnetic Non-Reciprocal Circulator Through Spatio-Temporal Conductivity Modulation,” (invited paper) IEEE Journal of Solid-State Circuits, vol. 52, no. 12, pp. 3276 - 3292, Dec. 2017.
  • Negar Reiskarimian, Jin Zhou and Harish Krishnaswamy “A CMOS Passive LPTV Non-Magnetic Circulator and Its Application in a Full-Duplex Receiver,” IEEE Journal of Solid State Circuits, vol. 52, no. 5, pp. 1358-1372, May 2017.
  • Negar Reiskarimian and Harish Krishnaswamy, “Magnetic-free Non-Reciprocity Based on Staggered Commutation,” Nature Communications 7:11217 doi: 10.1038/ncomms11217 (2016).
  • Harish Krishnaswamy and Linxiao Zhang, "Analog and RF Interference Mitigation for Integrated MIMO Receiver Arrays," (invited paper) Proceedings of the IEEE, vol. 104, no.3, pp. 561-575, March 2016.
  • Jin Zhou, Tsung-Hao Chuang, Tolga Dinc and Harish Krishnaswamy, “Integrated Wideband Self-Interference Cancellation in the RF Domain for FDD and Full-Duplex Wireless,” (invited paper) IEEE Journal of Solid-State Circuits, vol. 50, no. 12, pp. 3015-3031, Dec. 2015.
  • Jin Zhou, Anandaroop Chakrabarti, Peter R. Kinget and Harish Krishnaswamy, “Low-Noise Active Cancellation of Transmitter Leakage and Transmitter Noise in Broadband Wireless Receivers for FDD/Co-Existence,” (invited paper) IEEE Journal of Solid-State Circuits, vol. 49, no. 12, pp. 3046 – 3062, December 2014.
  • Anandaroop Chakrabarti and Harish Krishnaswamy, “High Power, High Efficiency Stacked mmWave Class-E-like CMOS Power Amplifiers: Theory and Implementation,” IEEE Transactions on Microwave Theory and Techniques, vol. 62, no. 8, pp. 1686 – 1704, August 2014.