## Contact

- Email:nataraja@eecs.oregonstate.edu

School of EECS,

1148 Kelley Engineering Center

Oregon State University

Corvallis, OR 97331-5501

- K. Raghavan, J. Kang, Y. Ramadass, and A. Natarajan, "A cm-Scale 2.4 GHz Wireless Energy Harvester with Co-Design of Antenna, Rectifier and Boost Converter for WiFi Powering of Sensor Nodes," (revisions under review) IEEE Journal of Solid-State Circuits
- A. Agrawal and A. Natarajan, "Analysis and Design of N-Path RF Band-Stop Filters Using Walsh-Function Based Sequence Mixing," (revisions under review) IEEE Transactions on Microwave Theory and Techniques
- J. Kang, P. Chiang, and A. Natarajan, "Bootstrapped Rectifier-Antenna Co-Integration for Increased Sensitivity in Wirelessly-Powered Sensors," accepted (minor revisions) to IEEE Transactions on Microwave Theory and Techniques
- A. Agrawal and A. Natarajan, "An Interferer-Tolerant CMOS Code-Domain Receiver Based on N-Path Filters," in IEEE Journal of Solid-State Circuits, vol. 53, no. 5, pp. 1387-1397, May 2018.
- R. Garg and A. Natarajan, "A 28-GHz Low-Power Phased-Array Receiver Front-End With 360° RTPS Phase Shift Range," in IEEE Transactions on Microwave Theory and Techniques, vol. 65, no. 11, pp. 4703-4714, Nov. 2017.
- A. Agrawal, and A. Natarajan, “Series Resonator Mode-Switching for Area-Efficient Octave Tuning-Range CMOS LC Oscillators,” IEEE Transactions on Microwave Theory and Techniques, vol. 65, no. 5, pp. 1569-1579, May 2017.
- L. Zhang, A. Natarajan, H. Krishnaswamy, “Scalable Spatial Notch Suppression in Spatio-Spectral-Filtering MIMO Receiver Arrays for Digital Beamforming,” IEEE Journal of Solid-State Circuits, vol. 51, no. 12, pp. 3152-3166, Dec. 2016.
- J. Kang, S. Rao, P. Chiang, and A. Natarajan, “Design and Optimization of Area-Constrained Wirelessly-Powered CMOS UWB SoC for Localization Applications”, IEEE Transactions on Microwave Theory and Techniques, vol. 64, no. 4, pp. 1042-1054, April 2016.
- Y. Liu, A. Agrawal, and A. Natarajan, “Millimeter-wave IC-Antenna Cointegration for Integrated Transmitters and Receivers,” in IEEE Antennas and Wireless Propagation Letters, vol. 15, pp. 1848-1852, Mar. 2016.
- X. Gu, A. Valdes-Garcia, A. Natarajan, B. Sadhu, D. Liu, and S. K. Reynolds, “W-band Scalable Phased Arrays for Imaging and Communications,” IEEE Communications Magazine, vol. 54, no. 4, pp. 196-204 Apr. 2015.
- A. Natarajan, A. Valdes-Garcia, B. Sadhu, S. Reynolds, B. Parker, “W-Band Dual-Polarization Phased-Array Transceiver Frontend in SiGe BiCMOS,” IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 6, pp. 1989-2002, June 2015.
- J. Cheng, N. Qi, P. Chiang, A. Natarajan, "A Low-Power, Low-Voltage WBAN-Compatible Sub-Sampling PSK Receiver in 65 nm CMOS," IEEE Journal of Solid-State Circuits (JSSC), vol.49, no.12, pp. 3018-3030, Dec. 2014.
- S. Sun, F. Wang, S. Yaldiz, X. Li, L. Pileggi, A. Natarajan, M. Ferriss, J.-O. Plouchart, B. Sadhu, B. Parker, A. Valdes-Garcia, M. Sanduleanu, J. Tierno, and D. Friedman, "Indirect Performance Sensing for On-Chip Self-Healing of Analog and RF Circuits," IEEE Transactions of Circuits and Systems-I, vol. 61, no. 8, pp. 2243-2252, Aug. 2014.
- J.-O. Plouchart, M. Ferriss, A. Natarajan, A. Valdes-Garcia, B. Sadhu, A. Rylyakov, B. Parker, M. Beakes, A. Babakhani, S. Yaldiz, L. Pileggi, R. Harjani, S. Reynolds, J. A. Tierno, and D. Friedman, "A 23.5GHz PLL with an Adaptively Biased VCO in 32nm SOI-CMOS," IEEE Transactions of Circuits and Systems-I, vol. 60, Aug. 2013, pp. 2009-2017.
- B. Sadhu, M. Ferriss, A. Natarajan, S. Yaldiz, J.-O. Plouchart, A. Rylyakov, A. Valdes-Garcia, B. Parker, A. Babakhani, S. Reynolds, X. Li, L. Pileggi, R. Harjani, J. Tierno and D. Friedman, "A Linearized, Low Phase Noise VCO Based 25GHz PLL with Autonomic Biasing," IEEE Journal of Solid-State Circuits, vol. 48, May 2013, pp. 1138-1150.
- M. Ferriss, J. -O. Plouchart, A. Natarajan, A. Rylyakov, B. Parker, J. Tierno, A. Babakhani, S. Yaldiz, A. Valdes-Garcia, B. Sadhu, and D. Friedman, "An Integral Path Self-Calibration Scheme for a Dual-Loop PLL," IEEE Journal of Solid-State Circuits, vol. 48, Mar. 2013.
- D. G. Kam, D. Liu, A. Natarajan, S. Reynolds, and B. A. Floyd, “Organic Packages with Embedded Phased-Array Antennas for 60-GHz Wireless Chipsets,” IEEE Transactions on Components, Packaging and Manufacturing Technology. vol. 1, Nov. 2011, pp. 1806-1814.
- A. Natarajan, S.K. Reynolds, M. D. Tsai, S.T. Nicolson, J.-H.C. Zhan, D. G. Kam, D. Liu, Y.-L.O. Huang, A. Valdes-Garcia, and B. A. Floyd, “A Fully-Integrated 16-Element Phased-Array Receiver in SiGe BiCMOS for 60-GHz Communications,” IEEE Journal of Solid-State Circuits, vol. 46, May 2011, pp. 1059-1075.
- A. Valdes-Garcia, S. Reynolds, A. Natarajan, D. Kam, D. Liu, J.-W. Lai, Y.-L.O. Huang, P.-Y. Chen, M.-D. Tsai, J.-H.C. Zhan, S. Nicolson, and B. Floyd, “Single-Element and Phased-Array Transceiver Chipsets for 60-ghz Gb/s Communications,” IEEE Communications Magazine, vol. 49, Apr. 2011, pp.120-131.
- D. G. Kam, D. Liu, A. Natarajan, S. Reynolds, H-C. Chen, and B. A. Floyd, “LTCC Packages With Embedded Phased-Array Antennas for 60 GHz Communications,” IEEE Microwave and Wireless Components Letters, vol. 21, Mar. 2011, pp. 142-144.
- A. Valdes-Garcia, S.T. Nicolson, J.-W. Lai, A. Natarajan, P.-Y. Chen, S.K. Reynolds, J.-H.C. Zhan, D.G. Kam, D. Liu, and B.A. Floyd, “A Fully Integrated 16-Element Phased-Array Transmitter in SiGe BiCMOS for 60-GHz Communications,” IEEE Journal of Solid-State Circuits, vol. 45, Dec. 2010, pp. 2757-2773.
- S. Jeon, Y-J. Wang, H. Wang, F. Bohn, A. Natarajan, A. Babakhani, and A. Hajimiri, “A Scalable 6-to-18 GHz Concurrent Dual-Band Quad-Beam Phased-Array Receiver in CMOS,” IEEE Journal of Solid-State Circuits, vol. 43, Dec. 2008, pp. 2660-2673.
- A. Babakhani, X. Guan, A. Komijani, A. Natarajan, A. Hajimiri, “A 77-GHz Phased-Array Transceiver with On-Chip Antennas in Silicon: Receiver and Antennas,” IEEE Journal of SolidState Circuits, vol. 41, Dec. 2006, pp. 2795-2806.
- A. Natarajan, A. Komijani, X. Guan, A. Babakhani, and A. Hajimiri, “A 77-GHz Phased-Array Transceiver with On-Chip Antennas in Silicon: Transmitter and Local LO-Path Phase Shifting,” IEEE Journal of Solid-State Circuits, vol. 41, Dec. 2006, pp. 2807-2819.
- A. Natarajan, A. Komijani, and A. Hajimiri, “A Fully Integrated 24-GHz Phased-Array Transmitter in CMOS,” IEEE Journal of Solid-State Circuits, vol. 40, Dec. 2005, pp. 2502-2514.
- A. Komijani, A. Natarajan, and A. Hajimiri, “A 24-GHz, +14.5-dBm Fully Integrated Power Amplifier in 0.18-µm CMOS,” IEEE Journal of Solid-State Circuits, vol. 40, Sep. 2005, pp. 1901-1908.
- A. Hajimiri, H. Hashemi, A. Natarajan, X. Guan, and A. Komijani, “Integrated Phased Array Systems in Silicon,” Proceedings of the IEEE, vol. 93, Sep. 2005, pp. 1637-1655.
- A. Hajimiri, A. Komijani, A. Natarajan, R. Chunara, X. Guan, and H. Hashemi, “Phased Array Systems in Silicon,” IEEE Communications Magazine, vol. 42, Aug. 2004, pp. 122-130.

- K. Raghavan, J. Kang, Y. Ramadass, and A. Natarajan, “A 960pW Co-Integrated-Antenna Wireless Energy Harvester for WiFi Backchannel Wireless Powering”, IEEE ISSCC, Feb. 2018.
- S. Jain, A. Agrawal, M. Johnson, and A. Natarajan, “An 0.55GHz-0.9GHz 2.7dB NF Full-Duplex Hybrid-Coupler Circulator with 56MHz 40dB TX SI Suppression”, IEEE ISSCC, Feb. 2018.
- S. Liverman, Q. Wang, Y-C. Chu, A. Borah, S. Wang, A. Natarajan, T. Nguyen, A. Wang, "Indoor communications networks realized through hybrid free-space optical and Wi-Fi links", Proc. SPIE 10559, Broadband Access Communication Technologies XII, 105590H, Jan. 2018
- Y. Liu and A. Natarajan, "60 GHz concurrent dual-polarization RX front-end in SiGe with Antenna-IC Co-Integration," IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), Oct. 2017
- Q. Wang, S. Liverman, Y-J. Chu, A. Borah, S. Wang, T. Nguyen, A. Natarajan, A. Wang, "WiFO: A Hybrid WiFi Free-Space Optical Communication Networks of Femtocells," Proc. of 20th ACM Intl. Conf. on Modelling, Analysis and Simulation of Wireless and Mobile Systems, pp. 35-42, Nov. 2017
- A. Agrawal and A. Natarajan, “A 0.3 GHz to 1.4 GHz N-path Mixer-based Code-Domain RX with TX Self-Interference Rejection”, IEEE RFIC, June 2017
- K. Raghavan, J. Kang, S. Jain, Y. Ramadass, and A. Natarajan, “A 365nW -61.5dBm Sensitivity, 1.875cm2 2.4GHz Wake-up Receiver with Rectifier-Antenna Co-design for Passive Gain,” IEEE RFIC, June 2017
- A. Agrawal and A. Natarajan, “A Concurrent Dual-Frequency/Angle-of-Incidence Spatio-spectral Notch Filter using Walsh Function Passive Sequence Mixers,” IEEE IMS, June 2017
- K. Zhan, A. Agrawal, M. Johnson, A. Ramachandran, T. Anand, and A. Natarajan, “An Integrated 7-Gb/s 60-GHz Communication Link Over Single Conductor Wire using Sommerfeld Wave Propagation in 65-nm CMOS,” IEEE IMS, June 2017
- K. Zhan, J. Kang, G. Wang, T. Kamgaing, R. Khanna, H. Liu, and A. Natarajan, “A Low-Power FSK/Spatial Modulation Transmitter for mm-Wave Wireless Links,” IEEE IMS, June 2017
- A. Ramachandran, A. Natarajan, and T. Anand, “A 16Gb/s, 3.6pJ/bit Wireline Transceiver with Phase Domain Equalization Scheme: Integrated Pulse Width Modulation (iPWM) in 65nm CMOS,” IEEE Intl. Solid-State Circuits Conf. (ISSCC), Feb. 2017.
- G. Wang, K. Zhan, T. Kamgaing, R. Khanna, H. Liu and A. Natarajan, "Measurement-based channel modeling for mmWave wireless links in enclosed server platforms," 2017 IEEE Radio and Wireless Symposium (RWS), Phoenix, AZ, 2017, pp. 141-143.
- S. Jain, Y. Wang, and A. Natarajan, "A 10GHz CMOS RX Frontend with Spatial Cancellation of Co-channel Interferers for MIMO/Digital Beamforming Arrays,” IEEE RFIC Symp., May 2016
- A. Tork and A. Natarajan, “Reconfigurable X-Band 4_4 Butler Array in 32nm CMOS SOI for Angle-Reject Arrays” to be presented at IEEE International Microw. Symp. (IMS), May 2016
- L. Zhang, A. Natarajan and H. Krishnaswamy, "A Scalable 0.1-to-1.7GHz Spatio-Spectral-Filtering 4-Element MIMO Receiver Array with Spatial Notch Suppression Enabling Digital Beamforming", IEEE Intl. Solid-State Circuits Symp. (ISSCC), Feb. 2016
- A. Agrawal and A. Natarajan, “A Scalable 28GHz Coupled-PLL in 65nm CMOS with Single-Wire Synchronization for Large-Scale 5G mm-Wave Arrays”, IEEE Intl. Solid-State Circuits Symp. (ISSCC), Feb 2016
- J. Kang, P. Chiang, and A. Natarajan, “A 1.2cm
^{2}2.4GHz Self-Oscillating Rectifier-Antenna Achieving -34.5dBm Sensitivity for Wirelessly Powered Sensors”, IEEE Intl. Solid-State Circuits Symp. (ISSCC), Feb 2016 - Y. Wang, Y. Liu, A. Agrawal, and A. Natarajan, "A 74.6GHz - 83.6GHz Digitally Controlled Oscillator with 370kHz Frequency Resolution in 65nm CMOS", IEEE Topical Meetings on Silicon Monolithic Integrated Circuits in RF Systems (SiRF), Jan 2016
- J. Kang, S. Rao, P. Chiang, and A. Natarajan, "Area-constrained Wirelessly-Powered UWB SoC Design for Small Insect Localization", invited to IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Jan 2016
- A. Agrawal and A. Natarajan, “A 6.39GHz-14GHz Series Resonator Mode-Switching Oscillator with 186-188dB FoM and 197dB FoMA in 65nm CMOS”, IEEE Radio Freq. IC Symp. (RFIC), May 2015
- J. Kang, P. Chiang, and A. Natarajan, “A 3.6 cm
^{2}Wirelessly-Powered UWB SoC with -30.7dBm Rectifier Sensitivity and Sub-10cm Range Resolution”, IEEE Radio Freq. IC Symp. (RFIC), May 2015, (nominated for Best Student Paper Award) - X. Gu, D. Liu, C. Baks, A. Valdes-Garcia, B. Parker, Md. R. Islam, A. Natarajan and S. Reynolds, "A Compact Four-Chip Package with 64 Embedded Dual-Polarization Antennas for W-Band Phased-Array Transceivers," IEEE Electronic Components and Technology Conference (ECTC), May 2014
- A. Valdes-Garcia, A. Natarajan, X. Gu, D. Liu, B. Sadhu, M. Sandulenau, M. Ferriss, C. Baks, J.-O. Plouchart, H. Ainspan, B. Parker, and S. Reynolds, "A Scalable System-in-Package Dual-Polarization 64-Element 94GHz Phased-Array Transceiver," Government Microcircuits Applications and Critical Technology Conference (GOMAC), Mar. 2014.
- J. Cheng, N. Qi, P. Y. Chiang, and A. Natarajan, “A 1.3mW, 0.6V, WBAN-Compatible, Sub-Sampling PSK Receiver in 65nm-CMOS,” to be presented at IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2014.
- S. Sun, F. Wang, S. Yaldiz, X. Li, L. Pileggi, A. Natarajan, M. Ferriss, J.-O.Plouchart, B. Sadhu, B. Parker, A. Valdes-Garcia, M. Sanduleanu, J. Tierno, and D. Friedman, "Indirect performance sensing for on-chip analog self-healing via Bayesian model fusion," IEEE Custom Integrated Circuits Conference (CICC), Sept. 2013.
- A. Valdes-Garcia, A. Natarajan, D. Liu, M. Sanduleanu, X. Gu, M. Ferriss, B. Parker, C. Baks, J.-O. Plouchart, H. Ainspan, B. Sadhu, Md. R. Islam, and S. Reynolds, "A Fully-Integrated Dual-Polarization 16-Element W-band Phased-Array Transceiver in SiGe BiCMOS," IEEE Radio Frequency Integrated Circuits Symposium (RFIC), June 2013.
- X. Gu, D. G. Kam, D. Liu, M. Piz, A. Valdes-Garcia, A. Natarajan, C. Baks, B. Sadhu, and S. Reynolds, "Enhanced multilayer organic packages with embedded phased-array antennas for 60-GHz wireless communications," IEEE Electronic Components and Technology Conference (ECTC), May 2013
- A. Valdes-Garcia, A. Natarajan, D. Liu, M. Sanduleanu, X. Gu, M. Ferriss, B. Parker, C. Baks, J.-O. Plouchart, H. Ainspan, B. Sadhu, Md. R. Islam, and S. Reynolds, "A 16-Tx, 32-Rx W-Band SiGe Phased-Array Transceiver IC and Package with Integrated Antennas for Scalable Radar and Imaging Applications," Government Microcircuits Applications and Critical Technology Conference (GOMAC), Mar. 2013.
- J.-O. Plouchart, M. Ferriss, A. Natarajan, A. Valdes-Garcia, B. Sadhu, A. Rylyakov, B. Parker, M. Beakes, A. Babakhani, S. Yaldiz, L. Pileggi, R. Harjani, S. Reynolds, J. Tierno, and D. Friedman, "A 23.5GHz PLL with an adaptively biased VCO in 32nm SOI-CMOS," IEEE Custom Integrated Circuits Conference (CICC), Sep. 2012, pp. 1-4.
- B. Sadhu, M. Ferriss, J.-O. Plouchart, A. Natarajan, A. Rylyakov, A. Valdes-Garcia, B. Parker, S. Reynolds, A. Babakhani, S. Yaldiz, L. Pileggi, R. Harjani, J. Tierno, and D. Friedman, "21.8–27.5GHz PLL in 32nm SOI using Gm linearization to achieve −130dBc/Hz phase noise at 10MHz offset from a 22GHz carrier," IEEE Radio Frequency Integrated Circuits Symposium (RFIC), June 2012, pp. 75-78.
- M. Ferriss, J. -O. Plouchart, A. Natarajan, A. Rylyakov, B. Parker, A. Babakhani, S. Yaldiz, B. Sadhu, A. Valdes-Garcia, J. Tierno, and D. Friedman, "An integral path self-calibration scheme for a 20.1–26.7GHz dual-loop PLL in 32nm SOI CMOS," IEEE VLSI Circuits Symposium, June 2012, pp. 176-177.
- A. Natarajan, M. Piz, A. Valdes-Garcia and S. Reynolds, “Phased-array Radar and Multistatic Array Imaging with 16-element 60GHz SiGe Tx and Rx,” Government Microcircuits Applications and Critical Technology Conference (GOMAC), Mar. 2012.
- S. Yaldiz, V. Calayir, X. Li, L. Pileggi, A. Natarajan, M. A. Ferriss and J. Tierno, “Indirect Phase Noise Sensing for Self-Healing Voltage Controlled Oscillators,” IEEE Custom Integrated Circuits Conference, Mar. 2011.
- D. G. Kam, D. Liu, A. Natarajan, S. Reynolds, and B. Floyd, “Low-cost Antenna-in-package Solutions for 60-GHz Phased-Array Systems,” IEEE Electrical Performance of Electronic Packages and Systems Conference (EPEPS), Oct. 2010, pp. 93-96.
- S. Reynolds, A. Natarajan, M.-D. Tsai, S. Nicolson, J.-H. Zhan, D. Liu, D. G. Kam, O. Huang, A. Valdes-Garcia, and B. Floyd, “A 16-element phased-array receiver IC for 60-GHz communications in SiGe BiCMOS,” IEEE Radio Frequency Integrated Circuits Conference (RFIC), May 2010, pp. 461-464.
- A. Valdes-Garcia, S. Nicolson, Jie-Wei Lai, A. Natarajan, Ping-Yu Chen, S. Reynolds, J.-H.C. Zhan, and B. Floyd, “A SiGe BiCMOS 16-element phased-array transmitter for 60GHz communications,” IEEE Solid-State Circuits Conference (ISSCC), Feb. 2010, pp. 218-219.
- A. Natarajan, M.-D. Tsai, and B. Floyd, “60GHz RF-path phase-shifting two-element phased-array front-end in Silicon,” IEEE Symposium on VLSI Circuits, June 2009, pp. 250-251.
- M.-D. Tsai and A. Natarajan, “60GHz passive and active RF-path phase shifters in silicon,” IEEE Radio Frequency Integrated Circuits Symposium (RFIC), June 2009, pp. 223-226.
- A. Natarajan, S. Nicolson, M.-D. Tsai, and B. Floyd, “A 60GHz variable-gain LNA in 65nm CMOS,” IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2008, pp. 117-120.
- F. Bohn, H. Wang, A. Natarajan, S. Jeon, and A. Hajimiri, “Fully integrated frequency and phase generation for a 6–18GHz tunable multi-band phased-array receiver in CMOS,” IEEE Radio Frequency Integrated Circuits Symposium (RFIC), June 2008, pp. 439-442.
- H. Wang, S. Jeon, Y.-J. Wang, F. Bohn, A. Natarajan, A. Babakhani, and A. Hajimiri, “A tunable concurrent 6-to-18GHz Phased-array system in CMOS,” IEEE Microwave Symposium Digest, June 2008, pp. 687-690.
- S. Jeon, Y.-J. Wang, H. Wang, F. Bohn, A. Natarajan, A. Babakhani, and A. Hajimiri, “A Scalable 6-to-18GHz Concurrent Dual-Band Quad-Beam Phased-Array Receiver in CMOS,” IEEE Solid-State Circuits Conference (ISSCC), Feb. 2008, pp. 186-605.
- A. Natarajan, B. Floyd, and A. Hajimiri, “A Bidirectional RF-Combining 60GHz Phased-Array Front-End,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2007, pp. 202-203.
- A. Babakhani, X. Guan, A. Komijani, A. Natarajan, and A. Hajimiri, “A 77GHz 4-Element Phased Array Receiver with On-Chip Dipole Antennas in Silicon,” IEEE Solid-State Circuits Conference (ISSCC), Feb. 2006, pp. 629-630.
- A. Natarajan, A. Komijani, X. Guan, A. Babakhani, Y. Wang, and A. Hajimiri, “A 77GHz PhasedArray Transmitter with Local LO-Path Phase-Shifting in Silicon,” IEEE Solid-State Circuits Conference (ISSCC), Feb. 2006, pp. 639-640.
- A. Natarajan, A. Komijani, and A. Hajimiri, “A 24 GHz phased-array transmitter in 0.18µm CMOS,” IEEE Design Automation Conference (DAC), June 2005, pp. 551- 552. [invited]
- A. Natarajan, A. Komijani, and A. Hajimiri, “A 24 GHz phased-array transmitter in 0.18µm CMOS,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2005, pp. 212-213.

- S. Reynolds, A. Valdes-Garcia, B. Floyd, Y. Katayama, and A. Natarajan, “Millimeter-Wave System Overview”, from Millimeter-Wave Antennas, Packaging and Beyond, Wiley, Chapter 16, 2009.

- Email:nataraja@eecs.oregonstate.edu

School of EECS,

1148 Kelley Engineering Center

Oregon State University

Corvallis, OR 97331-5501