Rui Ma

Rui Ma
  • Biography

    Prior to joining MERL in 2012, Rui was a Senior Power Amplifier Research Engineer at Nokia Siemens Networks. His research interests include RF Power Device Modeling, Power Amplifier / Radio Front-End Architectures, non-linear microwave circuit design, and high frequency measurement techniques. He is an Associate Editor of IEEE Transactions on Microwave Theory and Techniques, and Associate Editor of IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology.

  • Recent News & Events

    •  NEWS   Rui Ma gives invited IEEE course on the latest insights in advanced radio frequency amplifiers
      Date: October 13, 2020
      Where: online
      MERL Contact: Rui Ma
      Research Areas: Communications, Electronic and Photonic Devices
      Brief
      • MERL researcher Dr. Rui Ma is invited to give a talk on the latest insights on RF power Amplifier design, which is one of series invited courses organized by IEEE Boston Section.

        Dr. Ma is addressing the advancement of digital radio transmitter based on enabling technology of GaN for next generation wireless communications.

        This six week lecture series is intended to give a broad overview of state-of-the-art RF PA techniques with practical aspects for working professionals together with students for future RF PA designers, from fundamentals to applications. It begins with a review of RF power amplifier concepts then teaches handset PA design techniques, issues and solutions faced with designing RF PAs for mobile applications. It also discusses high efficiency amplifier structures with different classes of operation, and other architectures. A high linearity techniques lecture with behavioral modelling will follow. GaAs/GaN MMIC level millimeter-wave amplifier design tutorials and techniques will be lectured including foundry/technology selection, loadpull, loadline analysis and simulations with EDA tools. Lastly, digital perspective transmitters will be presented using GaN technology together with FPGA and ASICs.
    •  
    •  TALK   Microwaving a Biological Cell Alive ‒ Broadband Label-Free Noninvasive Electrical Characterization of a Live Cell
      Date & Time: Tuesday, August 25, 2020; 11:00 AM
      Speaker: Prof. James Hwang, Cornell University
      MERL Host: Rui Ma
      Research Areas: Applied Physics, Electronic and Photonic Devices
      Brief
      • Microwave is not just for cooking, smart cars, or mobile phones. We can take advantage of the wide electromagnetic spectrum to do wonderful things that are more vital to our lives. For example, microwave ablation of cancer tumor is already in wide use, and microwave remote monitoring of vital signs is becoming more important as the population ages. This talk will focus on a biomedical use of microwave at the single-cell level. At low power, microwave can readily penetrate a cell membrane to interrogate what is inside a cell, without cooking it or otherwise hurting it. It is currently the fastest, most compact, and least costly way to tell whether a cell is alive or dead. On the other hand, at higher power but lower frequency, the electromagnetic signal can interact strongly with the cell membrane to drill temporary holes of nanometer size. The nanopores allow drugs to diffuse into the cell and, based on the reaction of the cell, individualized medicine can be developed and drug development can be sped up in general. Conversely, the nanopores allow strands of DNA molecules to be pulled out of the cell without killing it, which can speed up genetic engineering. Lastly, by changing both the power and frequency of the signal, we can have either positive or negative dielectrophoresis effects, which we have used to coerce a live cell to the examination table of Dr. Microwave, then usher it out after examination. These interesting uses of microwave and the resulted fundamental knowledge about biological cells will be explored in the talk.
    •  

    See All News & Events for Rui
  • Awards

    •  AWARD   Former Intern Receives IBM Scientific Award Honorable Mention
      Date: January 16, 2019
      Awarded to: Daniel Dinis
      MERL Contact: Rui Ma
      Research Areas: Communications, Signal Processing
      Brief
      • Former MERL intern Daniel Dinis from University of Aveiro (UA), Portugal has received the 2018 IBM Scientific Award with Honorable Mention referring to the contributions on "Real-time Tunable Delta-sigma modulators for All-Digital RF Transmitters" in his Ph.D. study.

        The award-winning work includes research conducted under the supervision of Arnaldo Oliveira and José Neto Vieira, professors from the Department of Electronics and Information Technology (DETI) of the UA, as well as contributions made during Daniel's 7 month internship in 2017 at MERL.

        The ceremony for the presentation of the 28th IBM Scientific Prize took on January 16th, at the Noble Hall of the Superior Technical Institute. It was chaired by Marcelo Rebelo de Sousa, President of the Portuguese Republic.
    •  
    See All Awards for MERL
  • Internships with Rui

    • MD1370: Machine Learning based DPD for Power Amplifier

      MERL is looking for a talented intern to work on the next generation Digital-predistortion algorithms for power amplifier linearization such as 5G. The development of a DPD system involves aspects of signal processing and statistical algorithm design, RF components and instrumentation, digital hardware and software. It is therefore both a challenging and intellectually rewarding experience. This will involve MATLAB coding, interfacing to test equipment such as power sources, signal generators and analyzers and construction and calibration of RF component assemblies. The ideal candidate should have knowledge and experience in adaptive signal processing, machine learning, and radio communication. Good practical laboratory skills are needed. RF semiconductor devices and circuit knowledge is a plus. Duration is 3 to 6 months.

    See All Internships at MERL
  • MERL Publications

    •  Sakata, S., Kato, K., Teranishi, E., Sugitani, T., Ma, R., Chuang, K., Wu, Y., Fukunaga, K., Komatsuszaki, Y., Kenichi, H., Yamanaka, K., Shinjo, S., "A Fully-Integrated GaN Doherty Power Amplifier Module with a Compact Frequency-Dependent Compensation Circuit for 5G massive MIMO Base Stations", IEEE International Microwave Symposium (IMS), June 2020.
      BibTeX TR2020-077 PDF
      • @inproceedings{Sakata2020jun,
      • author = {Sakata, Shuichi and Kato, Katsuya and Teranishi, Eri and Sugitani, Takumi and Ma, Rui and Chuang, Kevin and Wu, Yuchen and Fukunaga, Kei and Komatsuszaki, Yuji and Kenichi, Horiguchi and Yamanaka, Koji and Shinjo, Shintaro},
      • title = {A Fully-Integrated GaN Doherty Power Amplifier Module with a Compact Frequency-Dependent Compensation Circuit for 5G massive MIMO Base Stations},
      • booktitle = {IEEE International Microwave Symposium (IMS)},
      • year = 2020,
      • month = jun,
      • url = {https://www.merl.com/publications/TR2020-077}
      • }
    •  Komatsuszaki, Y., Ma, R., Sakata, S., Nakatani, K., Shinjo, S., "A Dual-Mode Bias Circuit Enabled GaN Doherty Amplifier Operating in 0.85-2.05GHz and 2.4-4.2GHz", IEEE International Microwave Symposium (IMS), June 2020.
      BibTeX TR2020-080 PDF
      • @inproceedings{Komatsuszaki2020jun,
      • author = {Komatsuszaki, Yuji and Ma, Rui and Sakata, Shuichi and Nakatani, Keigo and Shinjo, Shintaro},
      • title = {A Dual-Mode Bias Circuit Enabled GaN Doherty Amplifier Operating in 0.85-2.05GHz and 2.4-4.2GHz},
      • booktitle = {IEEE International Microwave Symposium (IMS)},
      • year = 2020,
      • month = jun,
      • url = {https://www.merl.com/publications/TR2020-080}
      • }
    •  Sravan Kumar, P., Ma, R., "Design Considerations and FPGA Implementation of a Wideband All-Digital Transmit Beamformer with 50% Fractional Bandwidth", IEEE International Microwave Symposium (IMS), June 2020.
      BibTeX TR2020-078 PDF
      • @inproceedings{SravanKumar2020jun,
      • author = {Sravan Kumar, Pulipati and Ma, Rui},
      • title = {Design Considerations and FPGA Implementation of a Wideband All-Digital Transmit Beamformer with 50% Fractional Bandwidth},
      • booktitle = {IEEE International Microwave Symposium (IMS)},
      • year = 2020,
      • month = jun,
      • url = {https://www.merl.com/publications/TR2020-078}
      • }
    •  Tanovic, O., Ma, R., Orlik, P.V., Megretski, A., "Optimal Power Encoding of OFDM Signals in All-Digital Transmitters", IEEE Global Communications Conference (GLOBECOM), DOI: 10.1109/GLOBECOM38437.2019.9014289, December 2019, pp. 1-6.
      BibTeX TR2019-137 PDF
      • @inproceedings{Tanovic2019dec,
      • author = {Tanovic, Omer and Ma, Rui and Orlik, Philip V. and Megretski, Aleksandre},
      • title = {Optimal Power Encoding of OFDM Signals in All-Digital Transmitters},
      • booktitle = {IEEE Global Communications Conference (GLOBECOM)},
      • year = 2019,
      • pages = {1--6},
      • month = dec,
      • publisher = {IEEE},
      • doi = {10.1109/GLOBECOM38437.2019.9014289},
      • issn = {2576-6813},
      • isbn = {978-1-7281-0962-6},
      • url = {https://www.merl.com/publications/TR2019-137}
      • }
    •  Yamashita, G., Tsujita, W., Tsutada, H., Ma, R., Wang, P., Orlik, P.V., Suzuki, S., Dobroiu, A., Asada, M., "Terahertz Polarimetric Sensing for Linear Encoder Based on a Resonant-Tunneling-Diode and CFRP polarizing plates", International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), DOI: 10.1109/IRMMW-THz.2019.8873859, September 2019, pp. 1-2.
      BibTeX TR2019-089 PDF
      • @inproceedings{Yamashita2019sep,
      • author = {Yamashita, Genki and Tsujita, Wataru and Tsutada, Hiroyuki and Ma, Rui and Wang, Pu and Orlik, Philip V. and Suzuki, Safumi and Dobroiu, Adrian and Asada, M.},
      • title = {Terahertz Polarimetric Sensing for Linear Encoder Based on a Resonant-Tunneling-Diode and CFRP polarizing plates},
      • booktitle = {International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)},
      • year = 2019,
      • pages = {1--2},
      • month = sep,
      • doi = {10.1109/IRMMW-THz.2019.8873859},
      • issn = {2162-2027},
      • url = {https://www.merl.com/publications/TR2019-089}
      • }
    See All Publications for Rui
  • MERL Issued Patents

    • Title: "Methods and Systems for Terahertz-Based Positioning"
      Inventors: Wang, Pu; Fu, Haoyu; Orlik, Philip V.; Koike-Akino, Toshiaki; Ma, Rui; Wang, Bingnan
      Patent No.: 10,795,151
      Issue Date: Oct 6, 2020
    • Title: "Mixed-mode Millimeter-wave Transmitter"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Nagai, Yukimasa
      Patent No.: 10,560,126
      Issue Date: Feb 11, 2020
    • Title: "System and Method for Generating High Speed Digitized-RF Signals"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Nagai, Yukimasa
      Patent No.: 10,523,478
      Issue Date: Dec 31, 2019
    • Title: "High Speed Digital Bit Generator for Optical Frontal Interface"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Nagai, Yukimasa
      Patent No.: 10,516,420
      Issue Date: Dec 24, 2019
    • Title: "Power Amplifier System and Learning-based Autotuning Method Thereof"
      Inventors: Ma, Rui; Benosman, Mouhacine; Manjunatha, Koushik; Niu, Sufeng; Da Cos, Daniel Antonio
      Patent No.: 10,454,427
      Issue Date: Oct 22, 2019
    • Title: "Digital Beamforming Transmitter Array System with Hardware Sharing and Reduction"
      Inventors: Wang, Bingnan; Peng, Zhengyu; Kim, Kyeong-Jin; Wang, Pu; Ma, Rui; Teo, Koon Hoo
      Patent No.: 10,270,510
      Issue Date: Apr 23, 2019
    • Title: "Multi-band radio frequency transmitter"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio; Teo, Koon Hoo; Orlik, Philip V.
      Patent No.: 10,187,232
      Issue Date: Jan 22, 2019
    • Title: "Noise Mitigating Quantizer for Reducing Nonlinear Distortion in Digital Signal Transmission"
      Inventors: Ma, Rui; Tanovic, Omer
      Patent No.: 10,177,776
      Issue Date: Jan 8, 2019
    • Title: "Methods and System of a Digital Transmitter with Reduced Quantization Noise"
      Inventors: Ma, Rui; Da Cos, Daniel Antonio
      Patent No.: 10,128,875
      Issue Date: Nov 13, 2018
    • Title: "Inter-Band CA Digital Transmitter with Multi-Stage Out-of-Band Noise Canceller"
      Inventors: Ma, Rui; Chung, SungWon; Teo, Koon Hoo
      Patent No.: 9,985,667
      Issue Date: May 29, 2018
    • Title: "Impedance Flattening Network for High Efficiency Wideband Doherty Power Amplifier"
      Inventors: Ma, Rui; Ali, Sheikh Nijam; Teo, Koon Hoo
      Patent No.: 9,948,246
      Issue Date: Apr 17, 2018
    • Title: "Wideband Self-Envelope Tracking RF Power Amplifier"
      Inventors: Ma, Rui; Teo, Koon Hoo; Chung, SungWon
      Patent No.: 9,780,730
      Issue Date: Oct 3, 2017
    • Title: "System and Method for Linearizing Power Amplifiers"
      Inventors: Koike-Akino, Toshiaki; Zhu, Qiuyao; Ma, Rui; Teo, Koon Hoo
      Patent No.: 9,749,163
      Issue Date: Aug 29, 2017
    • Title: "Method to Generate Multilevel Inverter Modulation Control Signals"
      Inventors: Duan, Chunjie; Teo, Koon Hoo; Ma, Rui
      Patent No.: 9,559,610
      Issue Date: Jan 31, 2017
    • Title: "Three-Way Sequential Power Amplifier System for Wideband RF Signal"
      Inventors: Ma, Rui; Shao, Jin; Teo, Koon Hoo
      Patent No.: 9,503,028
      Issue Date: Nov 22, 2016
    • Title: "System and Method for Generating Multi-Band Signal"
      Inventors: Ma, Rui; Chung, SungWon; Teo, Koon Hoo
      Patent No.: 9,294,079
      Issue Date: Mar 22, 2016
    • Title: "System and Method for Linearizing Power Amplifiers"
      Inventors: Koike-Akino, Toshiaki; Zhu, Qiuyao; Ma, Rui; Teo, Koon Hoo
      Patent No.: 9,270,504
      Issue Date: Feb 23, 2016
    • Title: "Output Matching Network for Wideband Power Amplifier with Harmonic Suppression"
      Inventors: Ma, Rui; Chung, SungWon; Teo, Koon Hoo
      Patent No.: 9,231,550
      Issue Date: Jan 5, 2016
    • Title: "Digital Power Encoder for Direct Digital-RF Transmitter"
      Inventors: Ma, Rui; Zhu, Qiuyao; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 9,100,265
      Issue Date: Aug 4, 2015
    • Title: "System and Method for Linearizing Power Amplifiers"
      Inventors: Ma, Rui; Zhu, Qiuyao; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 9,054,940
      Issue Date: Jun 9, 2015
    • Title: "Reconfigurable Output Matching Network for Multiple Power Mode Power Amplifiers"
      Inventors: Ma, Rui; Goswami, Sushmit; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 8,963,644
      Issue Date: Feb 24, 2015
    • Title: "Digital Power Encoder for Direct Digital-RF Transmitter"
      Inventors: Ma, Rui; Zhu, Qiuyao; Teo, Koon Hoo; Duan, Chunjie
      Patent No.: 8,953,670
      Issue Date: Feb 10, 2015
    • Title: "High Electron Mobility Transistor with Multiple Channels"
      Inventors: Teo, Koon Hoo; Feng, Peijie; Ma, Rui
      Patent No.: 8,907,378
      Issue Date: Dec 9, 2014
    See All Patents for MERL