Research & Publication

Dr. KARUN RAWAT

Assistant Professor

Department of Electronics and communication Engineering

IIT Roorkee

Research Thrust

 

 Broad-band power efficient amplification scheme for high crest factor signals and LTE carrier aggregation.

 Multi-port networks for wideband wireless communication signals with high power direct modulation.

 All-digital transmitters with spectral and energy efficient power amplification.

 Broad-band/Multi-band harmonically terminated power amplifiers.

 CMOS and GaN MMIC based power amplifiers design.

 

 

Project Grant and Consultancy

 

1. Broad-Band Gallium Nitride Based Doherty Power Amplifier for Efficient Amplification of High Crest Factor Signals”, Sponsoring Agency: Department of Science & Technology Grant, Government of India, Amount: Rs. 53.64 Lac, Duration: 3 years, (Status: Completed, Report Submitted.)

 

2. "Study of Design Feasibility for High Power GaN based Power Amplifier at Ku-Band in Hybrid MIC Technology", Sponsoring Agency: Advanced Semiconductor Technology (ASemiT), DRDO, Government of India, Amount: Rs. 24.48 Lacs, Duration: 1.5 years, Status: Ongoing.

 

3. .Infrastructural grant, Sponsoring Agency: DeitY, Government of India, under Visvesvaraya PhD Scheme for Electronics and IT, Amount: Rs. 5 Lac, Duration: 1.5 years, Status: Ongoing.

 

4. "Study and Design Challenges in GaN MMIC based Power Amplifier at Ku-Band" Sponsoring Agency: Advanced Semiconductor Technology (ASemiT), DRDO, Government of India, Amount: Rs. 23 Lacs, Duration: 3 years, Status: Ongoing.

 

5. Consultancy project “Experiments development for Software defined radio SDR-Lab” by Industrial Client Amitec Electronics Ltd., New Delhi, Amount: Rs. 5.86 Lac, Duration: 6 Months, Status: Completed.

 

6. Consultancy project "RF Power Amplifier Design based on SSPL GaN Devices”, Sponsoring Agency: Solid State Physics Laboratory, DRDO, Government of India, Amount: Rs. 9.5 Lac, Duration: 1.5 years, Status: Completed.

 

7. " Design & Characterization of High Efficiency Radio Frequency Switch Mode Power Amplifiers", Faculty Initiation grant, IIT Roorkee, Amount: Rs. 10.0 Lac, Duration: 1 year, Status: Completed.

 

8. “Lab Facility for RF and Baseband techniques in Software Defined Radio” IIT Delhi, Amount: Rs. 28.0 Lac, Duration: 1 year, Status: Completed.

 

9. "Multiband/Multi-Standard Concurrent Doherty Power Amplifier", Faculty Initiation grant, IIT Delhi, Amount: Rs. 10.0 Lac, Duration: 1.5 year, Status: Completed.

 

 

Books

 

1. Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi, "Multiband RF Circuits and Techniques for Wireless Transmitters", Publisher: Springer, ISBN/DOI: ISBN: 978-3-662-50438-3, DOI: 10.1007/978-3-662-50440-6, Edition 1, 2016.

 

 

 

 

 

 

 

 

 

 

 

2. "Bandwidth and Efficiency Enhancement in Radio Frequency Power Amplifiers for Wireless Transmitters" Springer 2018 (accepted contract signed).

 

3. Chapter 12: Power amplifier design based on nonlinear embedding models with particular examples, in IET Book “Radio Frequency and Microwave Power Amplifiers: Theory, Design and Applications”, Guest Editor: Andrea Grebennikov.

 

 

Patents

 

1. Patent application on " Time Interleaved Digital Transmitter using Multi-Level Digital Quantization" filed at the Indian Patent Office on June, 2018 (File No. 201811021993).

 

 

Journals

 

2018

  1. C. Pathak, K. Rawat, " Nonlinear Characterization & Distortion Mitigation in Six-Port Modulator", IEEE Transactions on Instrumentation and Measurement. (accepted for publication)

 

  1. R. Kalyan, K. Rawat, S. K. Koul, "A Digitally assisted dual-input dual-band Doherty power amplifier with enhanced efficiency and linearity", IEEE Transactions on Circuits and Systems-II. (accepted)

 

  1. A. Barthwal, K. Rawat, S. K. Koul, "A Design Strategy for Bandwidth Enhancement in Three-stage Doherty Power Amplifier with Extended Dynamic Range", IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 2, pages: 1024-1033, Feb. 2018.

 

 

2017

  1. E. Aggrawal, K. Rawat, P. Roblin, "Investigating Continuous Class-F Power Amplifier Using Nonlinear Embedding Model", IEEE Microwave Wireless Component Letters, vol. 27, no. 6, pages 593–595, July 2017.

 

  1. R. Kalyan, K.Rawat, S.K. Koul, "Reconfigurable and Concurrent Dual-band Doherty Power Amplifier for Multi-band and Multi-standard Applications", IEEE Transactions on Microwave theory and Techniques, vol. 65, no. 1, pages: 198-208, Jan. 2017.

 

2016

  1. S. Saxena, K. Rawat, P. Roblin, "Continuous Class-B/J Power Amplifier Using Nonlinear Embedding Technique", IEEE Transactions on Circuit & System-II, vol. 64, Issue 7, pages 837–841, July 2017.

 

 

2015

  1. K. Rawat, G. Gowrish, G. Ajmera, A. Basu, S.K. Koul, "Design scheme for broadband Doherty power amplifier using broadband load combiner", Wiley International Journal of RF and Microwave Computer-Aided Engineering, vol. 25, Issue 8, pages 655–674, October 2015.

 

  1. R. Kalyan, K. Rawat, K. S.K. Koul, " Design strategy of concurrent multi-band Doherty power amplifier", IET Microwaves, Antenna & Propagation, vol. 9, no. 12, pages:1313-1322, Sep. 2015.

 

  1. A. Barthwal, K. Rawat, S.K. Koul, "Bandwidth Enhancement of Three-Stage Doherty Power Amplifier Using Symmetric Devices", IEEE Transactions on Microwave theory and Techniques, vol. 63, no. 8, pages: 2399-2410, Aug. 2015.

 

  1. M. Jouzdani, M. M. Ebrahimi, K. Rawat, M. Helaoui, F.M. Ghannouchi, “Envelope Tracked Pulse Gate Modulated GaN HEMT Power Amplifier for Wireless Transmitters, ” in IEEE Transaction on circuits and Systems-I, vol. 62, no. 2, pages:571-579, Feb. 2015.

 

  1. R. Bhattacharya, A. Basu, K. Rawat, S.K. Koul, “A high efficiency inductor-less broadband fully integrated CMOS power amplifier, ” in Wiley International Journal of RF and Microwave Computer-Aided Engineering, Vol. 25, no. 4, pages 311–320, May 2015.

 

2014

  1. M. Rawat, K. Rawat, R. Darraji, F. E. Alfaro, S. A. Bassam, M. Helaoui, F. M. Ghannouchi, M. Fattouche and F. Falcone, “Cooperative network solution and implementation for emergency applications with enhanced position estimation capability,” Wireless Networks, Vol. 20, no. 5, pp 1157–1168 ,July 2014

 

  1. L. Azpilicueta, M. Rawat, K. Rawat, F. Ghannouchi, and F. Falcone, “A Ray Launching-Neural Network Approach for Radio Wave Propagation Analysis in Complex Indoor Environments, ” in IEEE Transactions on Antenna and Propagation, IEEE Transactions on Antenna and Propagation, vol. 62, no. 5, pp. 2777-2786, May 2014.

 

  1. R. Bhattacharya, R. Gupta, A. Basu, K. Rawat & S. K. Koul, "A Fully Integrated Dual-Band CMOS Power Amplifier Using a Variable Switched Interstage Matching Network", IETE Journal of Research, Volume 60, Issue 2, 2014,pp- 139-144.

 

  1. M. Rawat, K. Rawat, F. Ghannouchi, S. Bhattacharjee and H. Leung, “Generalized Rational Functions for Reduced Complexity Behavioral Modeling and Digital Predistortion of Broadband Wireless Transmitters,” IEEE Transactions on Instrumentation and Measurement., vol. 63, no. 2, pp. 485 - 498, February 2014.

 

2013

  1. K. Rawat, M. Rawat, M.S. Hashmi, F.M. Ghannouchi, “Dual Band branch-line hybrid with distinct power division ratio at two bands ” in Wiley International Journal of RF and Microwave Computer-Aided Engineering, vol. 23, no. 1, Jan. 2013, pages 90–98.

 

  1. M. Rawat, K. Rawat, M. Younes and F. M. Ghannouchi, "Joint Mitigation of Non-Linearity and modulator imperfections in a dual-band Concurrent Transmitter Using Neural Networks," IET Electronics Letters, Vol. 49: Issue 4, pp. 253-255, February 2013.

 

  1. M. Rawat, K. Rawat, and F. M. Ghannouchi, “Three-Layered Biased Memory Polynomial for Dynamic Modeling and Predistortion of Transmitters,” in IEEE Transaction on circuits and Systems-I, vol. 60, no. 3, pages:768-777, March 2013.

 

2012

  1. K. Rawat, M.S. Hashmi, F.M. Ghannouchi, “Double the band and optimize” in IEEE Microwave Magazine, vol. 13, no. 2, April 2012, pages: 69-82.

 

  1. K. Rawat, M.S. Hashmi, F.M. Ghannouchi, “Dual-Band RF Circuits and Components for Multi-standard Software Defined Radios” in IEEE Circuit and Sys. Magazine, vol. 12, no. 1, Mar. 2012, pages: 12-32.

 

  1. K. Rawat, F.M. Ghannouchi, “Design methodology for dual-band Doherty power amplifier with performance enhancement using dual-Band offset lines,” in IEEE Trans. Industrial Electronics, vol.59, no. 12, Dec. 2012, pages:4831-4842.

 

2011

  1. K. Rawat, F.M. Ghannouchi, “A Novel Dual-Band Matching Technique Based on Dual-Characteristic Impedance Transformer for Dual-Band Power Amplifier Design” in IET Microwaves, Antennas & Propagation, vol. 5, no. 14, Nov 2011, pages: 1720-1729.

 

  1. K. Rawat, F.M. Ghannouchi, M.Rawat, M.S. Hashmi, “Analysis of Frequency Selective Impedance Loading of Transmission Lines for Dual Band Couplers,” in Wiley International Journal of RF and Microwave Computer-Aided Engineering, vol. 21, no. 3, May 2011, pages: 325-335.

 

  1. W. Chen, S.A. Bassam, Li Xiang, Liu Yucheng, K. Rawat, M. Helaoui, F.M. Ghannouchi and F. Zhenghe,“ Design and linearization of concurrent dual-band Doherty power amplifier with frequency-dependent power ranges,” in IEEE Transactions on Microwave theory and Techniques, vol. 59, no. 10, pp. 2537–2546, Oct. 2011.

 

  1. M. Rawat, K. Rawat, and F. M. Ghannouchi, “Recent Advances on Signal Processing Solutions for Distortion Mitigation Due to Power Amplifier and Non-Ideality of Transmitter System,” in journal Recent Patents on Signal Processing, vol. 1: no. 2, pp. 135-142, December 2011.

 

2010

  1. K. Rawat, M. Rawat, F.M. Ghannouchi, “Compensating I-Q Imperfections in Hybrid RF/Digital Predistortion with Adapted Look up Table Implemented in FPGA,” in IEEE Transactions on Circuits and Systems II, vol. 57, no. 5, May 2010, pages: 389-393.

 

  1. M. S. Hashmi, F. M. Ghannouchi, P. J. Tasker, K. Rawat, “Highly Reflective Load-Pull Techniques for Microwave Power Device Characterization,” in IEEE microwave Magazine, vol.12 , no.4, pages: 96 - 107, Jan 2010.

 

  1. M. Rawat, K. Rawat, F.M. Ghannouchi, “Adaptive Digital Predistortion of Wireless Power Amplifiers/Transmitters Using Dynamic Real-Valued Focused Time-Delay Line Neural Networks,” in IEEE Transactions on Microwave theory and Techniques, vol.58 , no.1, pages: 95-104, Jan 2010.

 

2009

  1. K. Rawat, F.M. Ghannouchi, “A Design Methodology for Miniaturized Power Dividers using Periodically Loaded Slow Wave Structure with Dual Band Applications,” in IEEE Transactions on Microwave theory and Techniques , vol. 57, no. 12, part 2, Dec 2009, pages: 3380-3388.

 

 

Conferences

2018

  1. A. K. Sahoo, K. Rawat, “A Wideband Rat-race Coupler Using Stepped Impedance Resonator,” accepted in IEEE International Wireless Symposium, Chengdu, China, May 2018.

 

  1. C. Pathak, K. Rawat, “Quadrature modulation using radio frequency wave correlation in multiport network,” 5th IEEE International Conference on Signal Processing and Integrated Networks (SPIN), New Delhi, India, Feb 2018, pp.1-3.

 

2017

  1. N. Kumar, Jai Datt Poonia, Karun Rawat, " Class S Power Amplifier based on CSCD with Delta-Sigma Modulation", IEEE Applied Electromagnetics Conference (AEMC-2017), 19th-22nd December,2017, Aurangabad, India.

 

  1. N. Kumar, K. Rawat, " Efficiency Enhancement in Delta-Sigma Modulator based Transmitter using Level Transformation", IEEE International Microwave and RF Conference (IMaRC2017), Ahmedabad, Dec., 2017.

 

  1. K. Rawat, Shiban Koul, "Efficiency and Bandwidth Enhancement in Power Amplifiers for Wireless Communication" invited paper in IEEE European Microwave Conference (EuMW), Nuremberg, Germany, Oct., 2017

 

  1. Pankaj Kakkad, Ekta Aggrawal, Karun Rawat, "De-embedded Model based Class-E Power Amplifier Using Waveform Engineering", IEEE International Conference on Computing Communication and Networking Technologies (ICCCNT-2017), New Delhi, India, 3-5 July, 2017.

 

  1. K. Rawat, S. Saxena, P. Roblin, " Continuous Class-B/J Power Amplifier Using Nonlinear Embedding Technique", invited paper in special session of TCAS, in IEEE International Symposium on circuits & Systems (ISCAS) 2017, Baltimore, USA, May, 2017.

 

2016

  1. Ayushi Barthwal, Karun Rawat, Shiban Koul, "Wideband Tri-stage Doherty Power Amplifier with Asymmetric current ratios" IEEE International Microwave and RF Conference (IMaRC-2016), New Delhi, India, Dec. 2016.

 

  1. R. Kalyan, K. Rawat, S. K. Koul, “Design of reconfigurable concurrent dual-band power amplifiers using reconfigurable concurrent dual-band matching network”, IEEE International Wireless Symposium (IWS 2016), Beijing, China, May 2016.

 

  1. Ekta Aggrawal, Samarth Saxena, Karun Rawat, " Broadband Power Ampliifer Design by Exploring Design Space of Continous ClassF mode" IEEE Asia Pacific Microwave Conference (APMC-2016), New Delhi, India, 2016.

 

  1. Lalbahadur Dube, Karun Rawat, Anajan Basu, Shiban K. Koul, “Modulator Design Using Six Port Microwave Network at a Carrier Frequency of 1.9 GHz”, IEEE International Conference on Wireless networks and Embedded systems, Punjab, India, Oct. 2016.

 

2015

  1. Samarth Saxena, Karun Rawat, Patrick Roblin, “Class-F GaN Power Amplifier Design Using Model- Based Nonlinear Embedding”, IEEE Applied Electromagnetics Conference (AEMC-2015) (IEEExplore), Guwahati, Assam, December 2015.

 

  1. Robin Kalyan, Karun Rawat, Shiban K. Koul, “Design of Reconfigurable Concurrent Dual-Band Quarter-Wave Transformer with Application of Power Combiner/Divider”, IEEE International Microwave and RF Conference (IMaRC2014) (IEEExplore), Hyderabad, December 2015.

 

2014

  1. K. Rawat, Gowrish B, Girish Ajmera, Robin Kalyan, Ananjan Basu, Shiban Koul, and Fadhel Ghannouchi, "Design Strategy for Tri-Band Doherty Power Amplifier" in 15th Annual IEEE Wireless and Microwave Technology Conference (WAMICON), Tampa, Florida, USA, June 2014.

 

  1. A. Barthwal, G. Ajmera, K. Rawat, A. Basu, S.K. Koul, “Design scheme for dual-band three stage Doherty Power Amplifiers”, in proceedings of IEEE International Microwave and RF Conference (IMaRC), 2014, Bangalore, Karnataka, India, Dec. 2014, Pages: 80-83.

 

  1. R. Bhattacharya, R. Gupta, A. Basu, K. Rawat, S.-K. Koul, “A Fully integrated CMOS Broad Band Power Amplifier Using a Low-Q Matching Strategy”, presented in 2014 Asia Pacific Microwave Conference, Sendai, Japan, Nov. 2014 (accepted and presented).

 

  1. Gowrish, B ; A. Bhat, A.B. Kiran, K. Rawat, "Optimal finite bit Pi representation", in proceedings of IEEE 2014 Region 10 Symposium, Kuala Lumpur, Malaysia, 14-16 April 2014, Pages: 387-390.

 

2013

  1. Gowrish B., K. Rawat, A. Basu, S. K. Koul, “Broad-band matching network using band-pass filter with device parasitic absorption”, in proceedings of 82nd ARFTG Microwave Measurement Conference, Columbus, Ohio, USA, Nov. 2013, Pages: 1-4.DOI: 10.1109/ARFTG-2.2013.6737361.

2012

  1. K. Rawat, F. M. Ghannouchi, “Load-pull assisted CAD design of inverted Doherty Amplifier without quarter-wave transformer” in proceedings of 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Montreal, Canada, April 29-May 2, 2012, Digital Object Identifier: 10.1109/CCECE.2012.6334931

 

  1. K. Rawat, M. Rawat, M.S. Hashmi, F. Falcone, F. M. Ghannouchi “ Dual-Band Phase Offset line with Required Transmission Phases at two Operational frequencies” in IEEE MTT-S International Microwave Symposium (IMS) 2012, Montreal, Canada, June 17-22, 2012. Digital Object Identifier: 10.1109/MWSYM.2012.6259591.

 

2011

  1. F. M. Ghannouchi, K. Rawat, “Doherty Power amplifier in software defined radio systems” invited paper in XXX URSI General Assembly and Scientific Symposium (GASS'2011), Istanbul, Turkey, 13-20 August 2011.

 

  1. Shubrajit Bhattacharjee, K. Rawat, Meenakshi Rawat, D. Wang, M. Helaoui, H. Leung, F. Ghannouchi, “Joint Evaluation and Mitigation of RF Impairments and Nonlinear Distortion in WiMAX Transceiver under Nakagami-m Fading Channel”, in proceedings of 24th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Niagara Falls, Ontario, May 2011, Pages: 1-4.

 

  1. M. Rawat, K. Rawat, F. Esparza, R. Darraji, V. Torres, Francisco Falcone, Fadhel Ghannouchi, “Directional beam forming for smart antenna with Ray-launching and neural networks”, in the 2011 IEEE AP-S International Symposium on Antennas and Propagation and 2011 USNC/URSI National Radio Science Meeting, Spokane, Washington, USA, July 3-8, 2011.

 

  1. V. Torres, F. Esparza, M. Rawat, K. Rawat, R. Darraji, F. M. Ghannouchi, Francisco Falcone, “Analysis of performance modeling of Wireless Systems in complex Indoor Scenarios”, in 2011 IEEE AP-S International Symposium on Antennas and Propagation and 2011 USNC/URSI National Radio Science Meeting, Spokane, Washington, USA, July 3-8, 2011.

 

  1. K. Rawat, F.M. Ghannouchi “C-Band microstrip based band-pass filter with design oriented transmission zeros allocation” in proceedings of 24th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Niagara Falls, Ontario, May 2011, Pages: 1-4.

 

2010

  1. F. E. Alfaro, M. Rawat, R. Darraji, K. Rawat, V. Torres, F. Falcone and F. M. Ghannouchi, "RF Environment Behavior Modeling Based on 3-D Ray-Tracing and Neural Networks to Mitigate Multipath in Indoor Position Estimation," in Wireless Innovation Conference, Washington DC, USA, Dec 2010.

 

2009

  1. K. Rawat, F.M. Ghannouchi “Design of Reduced Size Power Divider for Lower RF Band using Periodically Loaded Slow Wave Structure” in proceedings of IEEE International Microwave Symposium (IMS), Boston, June 2009, Pages: 613-616.

 

  1. K. Rawat, O. Hammi, F.M. Ghannouchi “Investigating Effects of Quadrature Imperfection of Vector Multiplier in Implementing RF/Digital Predistortion” in proceedings of IEEE Wireless and Microwave Conference (WAMICON), Florida, April 2009, Pages: 1-4.

 

  1. S. Tiwari, R. Darraji, S.A. Bassam, A. Kwan, K. Rawat, M. Rawat, M. Fattouche, F.M. Ghannouchi, “Practical result of wireless indoor position estimation by using hybrid TDOA/RSS algorithm” in proceedings of 23rd IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Calgary, April 2009, Pages: 1-5.