Sashank Krishnamurthy

Assistant Professor, IIT Madras

Email: sashank@ee.iitm.ac.in

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Publications

Journal Articles

  1. Analysis and Design of Channel-Selective, Bandwidth Reconfigurable, Wideband Low Noise Amplifier with Dual-Frequency N-Path Filters , IEEE Transactions on Microwave Theory and Techniques, Accepted, S. Gupta, S. Krishnamurthy*, A. Ravi, O. Degani, A. Natarajan.
  2. A 108 Gb/s PAM-4 VCSEL-Based Direct-Drive Optical Engine for Co-Packaged Optics Applications , IEEE Journal of Solid State Circuits 61(1), S. Mondal*, S. Krishnamurthy*, J. Qiu, T. Acikalin, S. Bose, S. Yamada, J. Jaussi, M. Mansuri.
  3. A 4× 50Gb/s 2.9pJ/b NRZ VCSEL-Based Co-Packaged Optical Link With Fiber-Termination , IEEE Journal of Solid State Circuits – Early Access, S. Krishnamurthy, S. Mondal, J. Qiu, J. Kennedy, S. Bose, T. Acikalin, S. Yamada, J. Jaussi, M. Mansuri.
  4. A 4Ch 64Gbps/Ch NRZ VCSEL-Based Co-Packaged and Fiber-Terminated Optical TX and 80Gbps Optical Driver , IEEE Journal of Solid State Circuits 61(2), S. Mondal, J. Qiu, S. Krishnamurthy, J. Kennedy, S. Bose, T. Acikalin, S. Yamada, J. Jaussi, M. Mansuri.
  5. A -11.6dBm OMA Sensitivity 0.55pJ/bit 40Gb/s Optical Receiver Designed Using a 2-Port-Parameter Based Design Methodology , IEEE Open Journal of the Solid-State Circuits Society, Y. Li, T. Wang, M.G. Ahmed, R. Xia, K-S. Park, M.A. Khalil, S. Krishnamurthy, Z. Xuan, G. Balamurugan, P.K. Hanumolu.
  6. Design of High-Linearity Mixer-First Receivers for mm-Wave Digital MIMO Arrays , IEEE Journal of Solid State Circuits, JSSC 56(11), 2021, S. Krishnamurthy, L. Iotti, A.M. Niknejad.
  7. Analysis and Design of Submilliwatt Interference-Tolerant Receivers Leveraging N-Path Filter-Based Translational Positive Feedback , IEEE Transactions on Microwave Theory and Techniques, TMTT 69(7), 2021, S. Krishnamurthy, F. Maksimovic, L. Iotti, A.M. Niknejad.
  8. An Enhanced Mixer-First Receiver With Distortion Cancellation, Achieving 80-dB/decade RF Selectivity and +8-dBm B1dB for Adjacent Channel Blockers , IEEE Solid State Circuits Letters 4, 2021, S. Krishnamurthy, A.M. Niknejad.
  9. Synthesis and Design of Enhanced N-Path Filters With 60-dB/decade RF Selectivity , IEEE Solid State Circuits Letters 3, 2020, S. Krishnamurthy, A.M. Niknejad.
  10. A Low-Power 70–100-GHz Mixer-First RX Leveraging Frequency-Translational Feedback , IEEE Journal of Solid State Circuits 55(8), 2020, L. Iotti, S. Krishnamurthy, G. LaCaille, A.M. Niknejad.
  11. Design and analysis of enhanced mixer-first receivers achieving 40-dB/decade RF selectivity , IEEE Journal of Solid State Circuits 55(5), 2020, S. Krishnamurthy, A.M. Niknejad.

Conference Papers

  1. A 5-7GHz Channel and Bandwidth Selective Shunt N-Path LNA Based Receiver with +6dBm OOC IB1dB, <-71dBm LO Re-Radiation for WiFi 7 Multi-Link Operation , IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2026, R. Krichman, A. Ravi, N. Ershengoren, R. Banin, S. Krishnamurthy, U. Grosglik, O. Tal, N. Sharvit, O. Avraham, S. Zur, O. Degani.
  2. An 800 Gbps/Fiber Silicon Photonic Microring-Based DWDM Transceiver in an Open-Cavity Package , IEEE VLSI Symposium on Technology and Circuits, 2026, C.S. Levy , J. Sharma, Z. Xuan, D. Huang, J. Gao, S. Liu, X. Wu, X. Wang, S. Mondal , S. Krishnamurthy, D. Lake, J. Jaussi.
  3. 50-GBaud+ VCSEL-Based Co-Packaged Optical Links: An Overview of Circuits and Systems , IEEE Custom Integrated Circuits Conference (CICC), 2026 – Invited Paper, S. Krishnamurthy*, S. Mondal*, J. Qiu, S. Yamada, Z. Zhou, J. Kennedy, J. Jaussi, M. Mansuri.
  4. A 32Gb/s/lane 0.83Tb/s/mm UCIe Compliant Die-to-Die Link Over 25mm Standard Package , IEEE Custom Integrated Circuits Conference (CICC), 2026 – Accepted, Z. Liu, S. Mondal, Y. Zhu, S. Krishnamurthy, S. Yamada, J. Qiu, S. Bose, Z. Wu, G. Pasdast, J. Jaussi, M. Mansuri.
  5. A 48Gb/s/lane 1.24Tb/s/mm UCIe-Compliant Die-to-Die Link Over 30mm Standard Package , IEEE International Solid State Circuits Conference (ISSCC), 2026, S. Mondal*, S. Krishnamurthy*, S. Yamada, Z.Liu, J. Qiu, S. Bose, Z. Wu, G. Pasdast, J. Jaussi, M. Mansuri.
  6. A Channel-Selective, Bandwidth-Reconfigurable Wideband Low Noise Amplifier with Dual-Frequency N-Path Filters , IEEE Radio and Wireless Symposium 2026, Los Angeles, CA – Accepted, S. Gupta, S. Krishnamurthy, A. Ravi, O. Degani, A. Natarajan.
  7. A 0.9pJ/b 108Gb/s PAM4 VCSEL-Based Direct-Drive Optical Engine , IEEE International Solid State Circuits Conference (ISSCC), 2025, S. Krishnamurthy*, S. Mondal*, J. Qiu, T. Acikalin, S. Bose, S. Yamada, J. Jaussi, M. Mansuri.
  8. A 4× 50Gb/s NRZ 1.5pJ/b Co-Packaged and Fiber-Terminated 4-Channel Optical RX , IEEE VLSI Symposium on Technology and Circuits, 2024, S. Krishnamurthy, S. Mondal, J. Qiu, J. Kennedy, S. Bose, T. Acikalin, S. Yamada, J. Jaussi, M. Mansuri.
  9. A Fully-Passive 4-Channel RF Beamformer with Ultra-Low Insertion Loss at 12GHz X/Ku-Band for Low-Power Applications in 28nm CMOS , IEEE MTT-S International Microwave Symposium (IMS), 2024, M.G. Anderson, S. Krishnamurthy, A.M. Niknejad, J. Rabaey.
  10. A 4x64Gb/s NRZ 1.3pJ/b Co-Packaged and Fiber-Terminated 4-Ch VCSEL-Based Optical Transmitter , IEEE International Solid State Circuits Conference (ISSCC), 2024, S. Mondal, J. Qiu, S. Krishnamurthy, J. Kennedy, S. Bose, T. Acikalin, S. Yamada, J. Jaussi, M. Mansuri.
  11. A D-Band Packaged CMOS Integrated Transmitter for MU-MIMO Applications , IEEE Asian Solid-State Circuits Conference (A-SSCC), 2022, M. Wei, N. Baniasadi, E. Chou, H. Beshary, S. Krishnamurthy, E. Alon, A.M. Niknejad.
  12. 10–35GHz Passive Mixer-First Receiver Achieving +14dBm in-band IIP3 for Digital Beam-forming Arrays , IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2020, S. Krishnamurthy, A.M. Niknejad.
  13. A Fully Integrated, Dual Channel, Flip Chip Packaged 113 GHz Transceiver in 28nm CMOS supporting an 80Gb/s Wireless Link , IEEE Custom Integrated Circuits Conference (CICC), 2020, A. Townley, N. Baniasadi, S. Krishnamurthy, C. Sideris, A. Hajimiri, E. Alon, A.M. Niknejad.
  14. Enhanced Passive Mixer-first Receiver Driving an Impedance with 40dB/decade Roll-off, Achieving +12dBm Blocker-P1dB, +33dBm IIP3 and sub-2dB NF Degradation for a 0dBm Blocker , IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2019, S. Krishnamurthy, A.M. Niknejad.
  15. 580µW 2.2–2.4GHz receiver with +3.3dBm out-of-band IIP3 for IoT applications , IEEE European Solid State Circuits Conference (ESSCIRC), 2018, S. Krishnamurthy, F. Maksimovic, A.M. Niknejad.

Patents

Granted

  1. Tunable bandpass low noise amplifier , US Patent 17/819,329, S. Krishnamurthy, A. Ravi, O. Degani.

Filed / Pending

  1. Miller N-Path Filter With Negative Resistance , US Patent App. 19/422,503, R. Banin, O. Degani, S. Krishnamurthy, A. Ravi.
  2. Interconnect Receiver Noise Mitigation , US Patent App. 19/340,195, S. Krishnamurthy, M. Mansuri, S. N. Tiagaraj, G. Pasdast.
  3. Voltage-Mode Amplifier , US Patent App. 18/979,656, S. Krishnamurthy, A. Ravi, O. Degani, S. Gupta, U. Grosglik.
  4. Post-Distortion Scheme for A Dual-Radio Wideband Receiver , US Patent App. 18/743,124, E. Banin, O.E. Avraham, A. Ravi, S. Krishnamurthy, O. Degani.
  5. Feedforward Equalizers , US Patent App. 18/619,714, S. Krishnamurthy, M. Mansuri.
  6. Wideband Channel Selective Amplifier Structures , US Patent App. 18/476,384, A. Ravi, O. Degani, S. Krishnamurthy, S. Gupta.
  7. Complex-Zero Equalizer Circuit , US Patent App. 18/467,659, S. Krishnamurthy, M. Mansuri.
  8. Methods and Arrangements for a Low-Noise Amplifier , US Patent App. 18/400,217, A. Ravi, S. Krishnamurthy, S. Gupta, O.E. Avraham, O. Degani.
  9. Methods and Arrangements for an N-Path Filter Using a Fourth Order All-Pole Driving Point Impedance , US Patent App. 18/372,604, S. Krishnamurthy.
  10. Edge combining sub-harmonic N-path filter , US Patent App. 18/088,928, R. Levinger, S. Gupta, S. Krishnamurthy, A. Ravi, O. Degani.