Analysis and Design of Radio-Frequency Linear Periodically-Time-Varying Circuits
Prof. Eric Klumperink
Twente University
|
Prof. Harish Krishnaswamy
Columbia University
|
Prof. Sudhakar Pamarti
University of California, Los Angeles
|
Prof. Ramesh Harjani
University of Minnesota
|
Abstract
Radio-frequency (RF) linear periodically-time-varying (LPTV) circuits have drawn tremendous research interest over the past several years, as they are theoretically appealing, enable functionalities that cannot be realized within conventional linear time-invariant (LTI) circuits, and have found practical application in emerging wireless communication paradigms, including software-defined radio and full-duplex wireless. While LPTV circuits have been studied for several decades, and discrete-time LPTV circuits have found widespread application, examples of recent exciting RF LPTV developments include the N-path filter, the mixer-first receiver, higher-order filters exploiting aliasing, and non-reciprocal circuits such as circulators and isolators. There have also been several interesting developments in the analysis of LPTV circuits including time-domain kernel-based analysis, frequency-domain conversion-matrix-based analysis and analysis using inter-reciprocity. This tutorial will bring together the leading experts in the field to take the attendees on a journey from the first demonstration 7 years ago to the rich tapestry of research that we are witnessing today.
Radio-frequency (RF) linear periodically-time-varying (LPTV) circuits have drawn tremendous research interest over the past several years, as they are theoretically appealing, enable functionalities that cannot be realized within conventional linear time-invariant (LTI) circuits, and have found practical application in emerging wireless communication paradigms, including software-defined radio and full-duplex wireless. While LPTV circuits have been studied for several decades, and discrete-time LPTV circuits have found widespread application, examples of recent exciting RF LPTV developments include the N-path filter, the mixer-first receiver, higher-order filters exploiting aliasing, and non-reciprocal circuits such as circulators and isolators. There have also been several interesting developments in the analysis of LPTV circuits including time-domain kernel-based analysis, frequency-domain conversion-matrix-based analysis and analysis using inter-reciprocity. This tutorial will bring together the leading experts in the field to take the attendees on a journey from the first demonstration 7 years ago to the rich tapestry of research that we are witnessing today.
History, Motivation and Focus
Linear, periodically-time-varying (LPTV) circuits have arguably become the hottest research topic in the RFIC community over the past 5-10 years. Following a seminal paper published in 2011 by Prof. Eric Klumperink and Prof. Bram Nauta on the N-path filter [1],[2], which revitalized a concept that was originally postulated nearly 70 years ago, it has become clear that LPTV circuits can achieve functionalities that are fundamentally impossible to achieve using the more conventional LTI circuits. Concurrently, Prof. Al Molnar at Cornell University developed similar concepts in the context of mixer-first receivers [3],[4], as did Drs. Ahmad Mirzaie and Hooman Darabi at Broadcom in the context of SAW-less receivers [5]. N-path filters and mixer-first receivers enable the realization of inductor-free tunable high-quality-factor filters at radio-frequencies, an advance that is both theoretically fascinating and practically critical for interference mitigation in software-defined RF radios. Subsequently, in 2013, Prof. Sudhakar Pamarti of UCLA showed that a time-varying resistor can be used to achieve functionality beyond the basic N-path filter, namely to realize a purely-passive, inductor-free higher-order high-Q tunable filter [6]. In 2015, Prof. Harish Krishnaswamy at Columbia showed that N-path-filter-like LPTV circuits could be used to realize large-valued compact bandpass delays for wideband self-interference cancellation [7]. In 2016, his group showed that LPTV circuits could realize passive, non-magnetic, non-reciprocal circuits, such as circulators and isolators, again both theoretically interesting in both the engineering and pure science communities and practically critical for the realization of full-duplex wireless transceivers [8]. This work was subsequently extended to millimeter-wave frequencies, thus expanding the reach of LPTV circuits [9]. In parallel, since 2012, Prof. Ramesh Harjani has been pursuing the use of LPTV charge-domain signal processors for various applications, including cognitive radio and wideband beamformers [10],[11].
As RF LPTV circuits have grown over the past several years to enable newer functionalities and find newer applications, there has been exciting progress in the circuits and systems (CAS) community on techniques to analyze their behavior. LPTV circuits fundamentally exhibit harmonic conversion effects which are not seen in LTI circuits. Prof. Eric Klumperink and Prof. Bram Nauta first published a time-domain analysis technique that enables computation of the harmonic transfer functions [12]. While mathematically rigorous, the technique is arguably cumbersome for more complex circuits. Prof. Sudhakar Pamarti then applied the conversion-matrix approach [13], a frequency-domain technique that lends itself to software-based computation, to the analysis of RF N-path filters [14]. More recently, Prof. Shanthi Pavan and Prof. Eric Klumperink have pioneered an approach that enables computation of LPTV response based on LTI equivalent circuits based on ideas of inter-reciprocity [15],[16]. This enables both hand analysis of the response and the development of intuition. Prof. Al Molnar concurrently has been addressing a theoretical treatment of N-path filters and mixer-first receivers that enables systematic design optimization [17] as well as an understanding of the impact of clock phase noise, the latter being a critical impairment that has confounded practitioners for years [18].
Switch-based LPTV circuits are notoriously hard to simulate using conventional device models, as traditional models do not handle the switch polarity reversal accurately. In this context, Prof. Molnar and Prof. Krishnaswamy have been working on device modeling approaches that overcome this challenge and allow designers to evaluate circuit linearity performance accurately [13],[14].
This tutorial will bring together the experts mentioned above to cover these advances in one sitting.
Linear, periodically-time-varying (LPTV) circuits have arguably become the hottest research topic in the RFIC community over the past 5-10 years. Following a seminal paper published in 2011 by Prof. Eric Klumperink and Prof. Bram Nauta on the N-path filter [1],[2], which revitalized a concept that was originally postulated nearly 70 years ago, it has become clear that LPTV circuits can achieve functionalities that are fundamentally impossible to achieve using the more conventional LTI circuits. Concurrently, Prof. Al Molnar at Cornell University developed similar concepts in the context of mixer-first receivers [3],[4], as did Drs. Ahmad Mirzaie and Hooman Darabi at Broadcom in the context of SAW-less receivers [5]. N-path filters and mixer-first receivers enable the realization of inductor-free tunable high-quality-factor filters at radio-frequencies, an advance that is both theoretically fascinating and practically critical for interference mitigation in software-defined RF radios. Subsequently, in 2013, Prof. Sudhakar Pamarti of UCLA showed that a time-varying resistor can be used to achieve functionality beyond the basic N-path filter, namely to realize a purely-passive, inductor-free higher-order high-Q tunable filter [6]. In 2015, Prof. Harish Krishnaswamy at Columbia showed that N-path-filter-like LPTV circuits could be used to realize large-valued compact bandpass delays for wideband self-interference cancellation [7]. In 2016, his group showed that LPTV circuits could realize passive, non-magnetic, non-reciprocal circuits, such as circulators and isolators, again both theoretically interesting in both the engineering and pure science communities and practically critical for the realization of full-duplex wireless transceivers [8]. This work was subsequently extended to millimeter-wave frequencies, thus expanding the reach of LPTV circuits [9]. In parallel, since 2012, Prof. Ramesh Harjani has been pursuing the use of LPTV charge-domain signal processors for various applications, including cognitive radio and wideband beamformers [10],[11].
As RF LPTV circuits have grown over the past several years to enable newer functionalities and find newer applications, there has been exciting progress in the circuits and systems (CAS) community on techniques to analyze their behavior. LPTV circuits fundamentally exhibit harmonic conversion effects which are not seen in LTI circuits. Prof. Eric Klumperink and Prof. Bram Nauta first published a time-domain analysis technique that enables computation of the harmonic transfer functions [12]. While mathematically rigorous, the technique is arguably cumbersome for more complex circuits. Prof. Sudhakar Pamarti then applied the conversion-matrix approach [13], a frequency-domain technique that lends itself to software-based computation, to the analysis of RF N-path filters [14]. More recently, Prof. Shanthi Pavan and Prof. Eric Klumperink have pioneered an approach that enables computation of LPTV response based on LTI equivalent circuits based on ideas of inter-reciprocity [15],[16]. This enables both hand analysis of the response and the development of intuition. Prof. Al Molnar concurrently has been addressing a theoretical treatment of N-path filters and mixer-first receivers that enables systematic design optimization [17] as well as an understanding of the impact of clock phase noise, the latter being a critical impairment that has confounded practitioners for years [18].
Switch-based LPTV circuits are notoriously hard to simulate using conventional device models, as traditional models do not handle the switch polarity reversal accurately. In this context, Prof. Molnar and Prof. Krishnaswamy have been working on device modeling approaches that overcome this challenge and allow designers to evaluate circuit linearity performance accurately [13],[14].
This tutorial will bring together the experts mentioned above to cover these advances in one sitting.
Speakers
• Prof. Eric Klumperink, Twente University in Enschede, The Netherlands
• Prof. Harish Krishnaswamy, Columbia University, USA
• Prof. Sudhakar Pamarti, UCLA, USA
• Prof. Ramesh Harjani, University of Minnesota, USA
Basic Structure of the Tutorial
• Prof. Eric Klumperink introduces the N-path filter and discusses the large body of work across the globe over the last 7 years in developing the concept further.
• Prof. Harish Krishnaswamy talks about non-reciprocity through time-variance, and shows how LPTV circuits are enabling new wireless communication paradigms, such as full-duplex wireless, massive MIMO etc.
• Prof. Sudhakar Pamarti talks about filtering via aliasing, through time-varying resistors
• Prof. Ramesh Harjani connects RF switched-capacitor LPTV circuits to analog discrete-time switched-capacitor signal processors and frequency hopped transceivers and talks about recent developments in that field.
• Prof. Eric Klumperink, Twente University in Enschede, The Netherlands
• Prof. Harish Krishnaswamy, Columbia University, USA
• Prof. Sudhakar Pamarti, UCLA, USA
• Prof. Ramesh Harjani, University of Minnesota, USA
Basic Structure of the Tutorial
• Prof. Eric Klumperink introduces the N-path filter and discusses the large body of work across the globe over the last 7 years in developing the concept further.
• Prof. Harish Krishnaswamy talks about non-reciprocity through time-variance, and shows how LPTV circuits are enabling new wireless communication paradigms, such as full-duplex wireless, massive MIMO etc.
• Prof. Sudhakar Pamarti talks about filtering via aliasing, through time-varying resistors
• Prof. Ramesh Harjani connects RF switched-capacitor LPTV circuits to analog discrete-time switched-capacitor signal processors and frequency hopped transceivers and talks about recent developments in that field.
References
[1] Ghaffari, A., Klumperink, E.A. and Nauta, B., 2010, May. A differential 4-path highly linear widely tunable on-chip band-pass filter. In RFIC Symposium, 2010 IEEE (pp. 299-302). IEEE.
[2] Ghaffari, A., Klumperink, E.A., Soer, M.C. and Nauta, B., 2011. Tunable high-Q N-path band-pass filters: Modeling and verification. IEEE Journal of Solid-State Circuits, 46(5), pp.998-1010.
[3] Andrews, C. and Molnar, A.C., 2010, February. A passive-mixer-first receiver with baseband-controlled RF impedance matching,≪ 6dB NF, and≫ 27dBm wideband IIP3. In Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2010 IEEE International (pp. 46-47). IEEE.
[4] Andrews, C. and Molnar, A.C., 2010. A passive mixer-first receiver with digitally controlled and widely tunable RF interface. IEEE Journal of solid-state circuits, 45(12), pp.2696-2708.
[5] Mirzaei, A., Chen, X., Yazdi, A., Chiu, J., Leete, J. and Darabi, H., 2009, June. A frequency translation technique for SAW-less 3G receivers. In VLSI Circuits, 2009 Symposium on (pp. 280-281). IEEE.
[6] Rachid, M., Pamarti, S. and Daneshrad, B., 2013. Filtering by Aliasing. IEEE Transactions on Signal Processing, 61(9), pp.2319-2327.
[7] Zhou, J., Chuang, T.H., Dinc, T. and Krishnaswamy, H., 2015. Reconfigurable receiver with> 20MHz bandwidth self-interference cancellation suitable for FDD, co-existence and full-duplex applications. ISSCC Dig. Tech. Papers, pp.342-343.
[8] Reiskarimian, N. and Krishnaswamy, H., 2016. Magnetic-free non-reciprocity based on staggered commutation. Nature communications, 7.
[9] Dinc, T., Tymchenko, M., Nagulu, A., Sounas, D., Alu, A. and Krishnaswamy, H., 2017. Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity. Nature Communications, 8(1), p.795.
[10] Sadhu, B., Sturm, M., Sadler, B.M. and Harjani, R., 2013. Analysis and Design of a 5 GS/s Analog Charge-Domain FFT for an SDR Front-End in 65 nm CMOS. IEEE Journal of Solid-State Circuits, 48(5), pp.1199-1211.
[11] Kalia, Sachin, Satwik A. Patnaik, Bodhisatwa Sadhu, Martin Sturm, Mohammad Elbadry, and Ramesh Harjani. "Multi-beam spatio-spectral beamforming receiver for wideband phased arrays." IEEE Transactions on Circuits and Systems I: Regular Papers 60, no. 8 (2013): 2018-2029.
[12] Soer, M.C., Klumperink, E.A., De Boer, P.T., Van Vliet, F.E. and Nauta, B., 2010. Unified frequency-domain analysis of switched-series-$ RC $ passive mixers and samplers. IEEE transactions on circuits and systems I: regular papers, 57(10), pp.2618-2631.
[13] Vanassche, P., Gielen, G. and Sansen, W., 2002. Symbolic modeling of periodically time-varying systems using harmonic transfer matrices. IEEE Transactions on computer-aided design of integrated circuits and systems, 21(9), pp.1011-1024.
[14] Hameed, S., Rachid, M., Daneshrad, B. and Pamarti, S., 2016. Frequency-Domain Analysis of N-Path Filters Using Conversion Matrices. IEEE Transactions on Circuits and Systems II: Express Briefs, 63(1), pp.74-78.
[15] Pavan, S. and Rajan, R.S., 2014. Interreciprocity in linear periodically time-varying networks with sampled outputs. IEEE Transactions on Circuits and Systems II: Express Briefs, 61(9), pp.686-690.
[16] Pavan, S. and Klumperink, E., 2017. Simplified Unified Analysis of Switched-RC Passive Mixers, Samplers, and N-Path Filters Using the Adjoint Network. IEEE TCAS I: Regular Papers.
[17] Yang, D., Andrews, C. and Molnar, A., 2015. Optimized design of N-phase passive mixer-first receivers in wideband operation. IEEE Transactions on Circuits and Systems I: Regular Papers, 62(11), pp.2759-2770.
[18] Tapen, T., Boynton, Z., Yüksel, H., Apsel, A. and Molnar, A., 2017. The Impact of LO Phase Noise in N-Path Filters. IEEE Transactions on Circuits and Systems I: Regular Papers.
[19] Yuksel, H., Yang, D. and Molnar, A.C., 2014, June. A circuit-level model for accurately modeling 3rd order nonlinearity in CMOS passive mixers. In Radio Frequency Integrated Circuits Symposium, 2014 IEEE (pp. 127-130). IEEE.
[20] Dastjerdi, M.B. and Krishnaswamy, H., 2017, June. A simplified CMOS FET model using surface potential equations for inter-modulation simulations of passive-mixer-like circuits. In Radio Frequency Integrated Circuits Symposium (RFIC), 2017 IEEE (pp. 132-135). IEEE.
[1] Ghaffari, A., Klumperink, E.A. and Nauta, B., 2010, May. A differential 4-path highly linear widely tunable on-chip band-pass filter. In RFIC Symposium, 2010 IEEE (pp. 299-302). IEEE.
[2] Ghaffari, A., Klumperink, E.A., Soer, M.C. and Nauta, B., 2011. Tunable high-Q N-path band-pass filters: Modeling and verification. IEEE Journal of Solid-State Circuits, 46(5), pp.998-1010.
[3] Andrews, C. and Molnar, A.C., 2010, February. A passive-mixer-first receiver with baseband-controlled RF impedance matching,≪ 6dB NF, and≫ 27dBm wideband IIP3. In Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2010 IEEE International (pp. 46-47). IEEE.
[4] Andrews, C. and Molnar, A.C., 2010. A passive mixer-first receiver with digitally controlled and widely tunable RF interface. IEEE Journal of solid-state circuits, 45(12), pp.2696-2708.
[5] Mirzaei, A., Chen, X., Yazdi, A., Chiu, J., Leete, J. and Darabi, H., 2009, June. A frequency translation technique for SAW-less 3G receivers. In VLSI Circuits, 2009 Symposium on (pp. 280-281). IEEE.
[6] Rachid, M., Pamarti, S. and Daneshrad, B., 2013. Filtering by Aliasing. IEEE Transactions on Signal Processing, 61(9), pp.2319-2327.
[7] Zhou, J., Chuang, T.H., Dinc, T. and Krishnaswamy, H., 2015. Reconfigurable receiver with> 20MHz bandwidth self-interference cancellation suitable for FDD, co-existence and full-duplex applications. ISSCC Dig. Tech. Papers, pp.342-343.
[8] Reiskarimian, N. and Krishnaswamy, H., 2016. Magnetic-free non-reciprocity based on staggered commutation. Nature communications, 7.
[9] Dinc, T., Tymchenko, M., Nagulu, A., Sounas, D., Alu, A. and Krishnaswamy, H., 2017. Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity. Nature Communications, 8(1), p.795.
[10] Sadhu, B., Sturm, M., Sadler, B.M. and Harjani, R., 2013. Analysis and Design of a 5 GS/s Analog Charge-Domain FFT for an SDR Front-End in 65 nm CMOS. IEEE Journal of Solid-State Circuits, 48(5), pp.1199-1211.
[11] Kalia, Sachin, Satwik A. Patnaik, Bodhisatwa Sadhu, Martin Sturm, Mohammad Elbadry, and Ramesh Harjani. "Multi-beam spatio-spectral beamforming receiver for wideband phased arrays." IEEE Transactions on Circuits and Systems I: Regular Papers 60, no. 8 (2013): 2018-2029.
[12] Soer, M.C., Klumperink, E.A., De Boer, P.T., Van Vliet, F.E. and Nauta, B., 2010. Unified frequency-domain analysis of switched-series-$ RC $ passive mixers and samplers. IEEE transactions on circuits and systems I: regular papers, 57(10), pp.2618-2631.
[13] Vanassche, P., Gielen, G. and Sansen, W., 2002. Symbolic modeling of periodically time-varying systems using harmonic transfer matrices. IEEE Transactions on computer-aided design of integrated circuits and systems, 21(9), pp.1011-1024.
[14] Hameed, S., Rachid, M., Daneshrad, B. and Pamarti, S., 2016. Frequency-Domain Analysis of N-Path Filters Using Conversion Matrices. IEEE Transactions on Circuits and Systems II: Express Briefs, 63(1), pp.74-78.
[15] Pavan, S. and Rajan, R.S., 2014. Interreciprocity in linear periodically time-varying networks with sampled outputs. IEEE Transactions on Circuits and Systems II: Express Briefs, 61(9), pp.686-690.
[16] Pavan, S. and Klumperink, E., 2017. Simplified Unified Analysis of Switched-RC Passive Mixers, Samplers, and N-Path Filters Using the Adjoint Network. IEEE TCAS I: Regular Papers.
[17] Yang, D., Andrews, C. and Molnar, A., 2015. Optimized design of N-phase passive mixer-first receivers in wideband operation. IEEE Transactions on Circuits and Systems I: Regular Papers, 62(11), pp.2759-2770.
[18] Tapen, T., Boynton, Z., Yüksel, H., Apsel, A. and Molnar, A., 2017. The Impact of LO Phase Noise in N-Path Filters. IEEE Transactions on Circuits and Systems I: Regular Papers.
[19] Yuksel, H., Yang, D. and Molnar, A.C., 2014, June. A circuit-level model for accurately modeling 3rd order nonlinearity in CMOS passive mixers. In Radio Frequency Integrated Circuits Symposium, 2014 IEEE (pp. 127-130). IEEE.
[20] Dastjerdi, M.B. and Krishnaswamy, H., 2017, June. A simplified CMOS FET model using surface potential equations for inter-modulation simulations of passive-mixer-like circuits. In Radio Frequency Integrated Circuits Symposium (RFIC), 2017 IEEE (pp. 132-135). IEEE.
Eric Klumperink received his PhD from Twente University in Enschede, The Netherlands, in 1997 where he is currently an Associate Professor. He teaches Analog and RF CMOS IC Design and guides research projects focussing on Software Defined Radio and Beamforming. Eric served as Associate Editor for IEEE TCAS-I, TCAS-II and the IEEE Journal of Solid-State Circuits (JSSC), as TPC member of ISSCC (2011-2016) and the RFIC Symposium (2011-..), and as SSC Distinguished Lecturer (2014/2015). He holds >10 patents, authored and co-authored >175 refereed journal and conference papers. He was recognized as top paper contributor to ISSCC, for >20 papers over 1954-2013, and was a co-recipient of the ISSCC 2002 and the ISSCC 2009 "Van Vessem Outstanding Paper Award".
For publications, see: https://icd.ewi.utwente.nl/persons/Klumperink/
Harish Krishnaswamy (S’03–M’09) received the B.Tech. degree in electrical engineering from IIT Madras, Chennai, India, in 2001, and the M.S. and Ph.D. degrees in electrical engineering from the University of Southern California (USC), Los Angeles, CA, USA, in 2003 and 2009, respectively. In 2009, he joined the Electrical Engineering Department, Columbia University, New York, NY, USA, where he is currently an Associate Professor and the Director of the Columbia High-Speed and Millimeter-Wave IC Laboratory (CoSMIC). In 2017, he co-founded MixComm Inc., a venture-backed startup, to commercialize CoSMIC Laboratory’s advanced wireless research. His current research interests include integrated devices, circuits, and systems for a variety of RF, mmWave, and sub-mmWave applications.
Dr. Krishnaswamy was a recipient of the IEEE International Solid-State Circuits Conference Lewis Winner Award for Outstanding Paper in 2007, the Best Thesis in Experimental Research Award from the USC Viterbi School of Engineering in 2009, the Defense Advanced Research Projects Agency Young Faculty Award in 2011, the 2014 IBM Faculty Award, and the 2015 IEEE Radio Frequency Integrated Circuits Symposium Best Student Paper Award (First Place). He has been a member of the technical program committee of several conferences, including the IEEE International Solid-State Circuits Conference since 2015 and the IEEE Radio Frequency Integrated Circuits Symposium since 2013. He currently serves as a Distinguished Lecturer for the IEEE Solid-State Circuits Society.
For a list of publications, see http://www.ee.columbia.edu/~harish/publications.html.
Sudhakar Pamarti is a professor of electrical and computer engineering at the University of California, Los Angeles. He received his the Bachelor of Technology degree in electronics and electrical communication engineering from the Indian Institute of Technology, Kharagpur in 1995, and the Ph.D. degrees in electrical engineering from the University of California, San Diego in 2003. Prior to joining UCLA, he has worked at Rambus Inc. (‘03-`05) and Hughes Software Systems (‘95-`97). Dr. Pamarti is a recipient of the National Science Foundation’s CAREER award for developing digital signal conditioning techniques to improve analog, mixed-signal, and radio frequency integrated circuits. He currently serves as an Associate Editor of the IEEE Transactions on Circuits and Systems I: Regular Papers and as a member of the CICC and ISSCC Technical Program Committees.
For a list of publications, see http://www.seas.ucla.edu/spgroup/publications.html.
Ramesh Harjani is the E.F. Johnson Professor of Electronic Communications in the Department of Electrical & Computer Engineering at the University of Minnesota. He is a Fellow of the IEEE. He received his Ph.D. in Electrical Engineering from Carnegie Mellon University in 1989. He was at Mentor Graphics, San Jose before joining the University of Minnesota. He has been a visiting professor at Lucent Bell Labs, Allentown, PA and the Army Research Labs, Adelphi, MD. He co-founded Bermai, Inc, a startup company developing CMOS chips for wireless multi-media applications in 2001. His research interests include analog/RF circuits for wireless communication systems. Dr. Harjani received the National Science Foundation Research Initiation Award in 1991 and Best Paper Awards at the 1987 IEEE/ACM Design Automation Conference, the 1989 International Conference on Computer-Aided Design, and the 1998 GOMAC. His research group was the winner of the SRC Design Challenge in 2000 and 2003. He was the Technical Program Chair for the IEEE Custom Integrated Circuits Conference 2012-2013, the Chair of the IEEE Circuits and Systems Society technical committee on Analog Signal Processing 1999-2000 and a Distinguished Lecturer of the IEEE Circuits and Systems Society 2001-2002. He was an Associate Editor for IEEE Transactions on Circuits and Systems Part II, 1995-1997, Guest Editors for the International Journal of High-Speed Electronics and Systems and for Analog Integrated Circuits and Signal Processing in 2004 and a Guest Editor for the IEEE Journal of Solid-State Circuits, 2009-2011. He was a Senior Editor for the IEEE Journal on Emerging & Selected Topics in Circuits & Systems (JETCAS), 2011-2013. He has given several plenary and keynote lectures at IEEE conferences.
For publications, see: http://people.ece.umn.edu/~harjani/publications1.html
For publications, see: https://icd.ewi.utwente.nl/persons/Klumperink/
Harish Krishnaswamy (S’03–M’09) received the B.Tech. degree in electrical engineering from IIT Madras, Chennai, India, in 2001, and the M.S. and Ph.D. degrees in electrical engineering from the University of Southern California (USC), Los Angeles, CA, USA, in 2003 and 2009, respectively. In 2009, he joined the Electrical Engineering Department, Columbia University, New York, NY, USA, where he is currently an Associate Professor and the Director of the Columbia High-Speed and Millimeter-Wave IC Laboratory (CoSMIC). In 2017, he co-founded MixComm Inc., a venture-backed startup, to commercialize CoSMIC Laboratory’s advanced wireless research. His current research interests include integrated devices, circuits, and systems for a variety of RF, mmWave, and sub-mmWave applications.
Dr. Krishnaswamy was a recipient of the IEEE International Solid-State Circuits Conference Lewis Winner Award for Outstanding Paper in 2007, the Best Thesis in Experimental Research Award from the USC Viterbi School of Engineering in 2009, the Defense Advanced Research Projects Agency Young Faculty Award in 2011, the 2014 IBM Faculty Award, and the 2015 IEEE Radio Frequency Integrated Circuits Symposium Best Student Paper Award (First Place). He has been a member of the technical program committee of several conferences, including the IEEE International Solid-State Circuits Conference since 2015 and the IEEE Radio Frequency Integrated Circuits Symposium since 2013. He currently serves as a Distinguished Lecturer for the IEEE Solid-State Circuits Society.
For a list of publications, see http://www.ee.columbia.edu/~harish/publications.html.
Sudhakar Pamarti is a professor of electrical and computer engineering at the University of California, Los Angeles. He received his the Bachelor of Technology degree in electronics and electrical communication engineering from the Indian Institute of Technology, Kharagpur in 1995, and the Ph.D. degrees in electrical engineering from the University of California, San Diego in 2003. Prior to joining UCLA, he has worked at Rambus Inc. (‘03-`05) and Hughes Software Systems (‘95-`97). Dr. Pamarti is a recipient of the National Science Foundation’s CAREER award for developing digital signal conditioning techniques to improve analog, mixed-signal, and radio frequency integrated circuits. He currently serves as an Associate Editor of the IEEE Transactions on Circuits and Systems I: Regular Papers and as a member of the CICC and ISSCC Technical Program Committees.
For a list of publications, see http://www.seas.ucla.edu/spgroup/publications.html.
Ramesh Harjani is the E.F. Johnson Professor of Electronic Communications in the Department of Electrical & Computer Engineering at the University of Minnesota. He is a Fellow of the IEEE. He received his Ph.D. in Electrical Engineering from Carnegie Mellon University in 1989. He was at Mentor Graphics, San Jose before joining the University of Minnesota. He has been a visiting professor at Lucent Bell Labs, Allentown, PA and the Army Research Labs, Adelphi, MD. He co-founded Bermai, Inc, a startup company developing CMOS chips for wireless multi-media applications in 2001. His research interests include analog/RF circuits for wireless communication systems. Dr. Harjani received the National Science Foundation Research Initiation Award in 1991 and Best Paper Awards at the 1987 IEEE/ACM Design Automation Conference, the 1989 International Conference on Computer-Aided Design, and the 1998 GOMAC. His research group was the winner of the SRC Design Challenge in 2000 and 2003. He was the Technical Program Chair for the IEEE Custom Integrated Circuits Conference 2012-2013, the Chair of the IEEE Circuits and Systems Society technical committee on Analog Signal Processing 1999-2000 and a Distinguished Lecturer of the IEEE Circuits and Systems Society 2001-2002. He was an Associate Editor for IEEE Transactions on Circuits and Systems Part II, 1995-1997, Guest Editors for the International Journal of High-Speed Electronics and Systems and for Analog Integrated Circuits and Signal Processing in 2004 and a Guest Editor for the IEEE Journal of Solid-State Circuits, 2009-2011. He was a Senior Editor for the IEEE Journal on Emerging & Selected Topics in Circuits & Systems (JETCAS), 2011-2013. He has given several plenary and keynote lectures at IEEE conferences.
For publications, see: http://people.ece.umn.edu/~harjani/publications1.html