Electronics Research Laboratory
Dept. of Microelectronics

dr. S.M. Alavi

Associate Professor
Electronic Circuits and Architectures (ELCA), Department of Microelectronics

PhD thesis (Jun 2014): All-Digital I/Q RF-DAC
Promotor: Bogdan Staszewski, Leo de Vreede

Expertise: RF Integrated Circuit

Themes: RF electronics

Biography

Morteza S. Alavi was born in Tehran, Iran. He received the B.S.E.E. and M.S.E.E. degrees from the Iran University of Science and Technology and the University of Tehran in 2003 and 2006, respectively, and his Ph.D. in electrical engineering from the Delft University of Technology (TU-Delft), Delft, The Netherlands, in 2014.

He was a Co-Founder and the CEO of DitIQ BV, Delft, a local company developing energy-efficient, wideband wireless transmitters for the next generation of the cellular network. Since September 2016, he has been with the Electronic Circuits and Architectures (ELCA) Research Group, TU-Delft, where he has been an Associate Professor. His main areas of research interest are designing single-chip RFICs for wireless and cellular communication systems and CMOS wireline transceivers. He has co-authored Radio-Frequency Digital-to-Analog Converter (Elsevier, 2016).

He was the Best Paper Award recipient of the 2011 IEEE International Symposium on Radio-Frequency Integrated Technology (RFIT). He received the Best Student Paper Award (Second Place) at the 2013 Radio-Frequency Integrated Circuits (RFIC) Symposium. His Ph.D. student also won the Best Student Paper Award (First Place) of the 2017 RFIC Symposium held in Honolulu, HI, USA. His research group received the 2021 Institute of Semiconductor Engineers (ISE) President Best Paper Award of the International SoC Design Conference (ISOCC). 

One of his Ph.D. students also received the Platinum Award (first place) for Huawei student RFIC design content 2021, and another student was awarded the 2021-2022 IEEE SSCS Predoctoral Achievement award. 

 

EE2C2 Mixed-Signal Circuits and Systems

EE4615 Digital IC design II

Designing digital CMOS circuit such as frequency dividers and time-to-digital (TDC) circuits

EE4C13 Wireless systems for electrical engineering applications

Commonly used RF electronics architectures in wireless systems, with the requirements on their building blocks.

ET4371 Mixed-mode wireless transceivers

Digital RF/Microwave System, Digital-Passive, All-digital RF synthesizers, transmitters and receivers

Education history

EE4600 Wireless Concepts and Systems

(not running) Basic concepts of RF design, such as noise, nonlinearity, Impedance Matching, Analog/Digital Modulation, Pulse-shaping, Mixer, Oscillator, Link-budget, Transmitter/Receiver Architectures

Digital RF Power

DISRUPT is an ERC Synergy project that aims to deliver fully digital, energy-efficient transmitters for applications in 5G and 6G wireless networks, targeting a 50% reduction in the overall energy consumption of wireless networks.

Digital tRAnSmitTer ICs

This project aims to develop silicon DTX ICs for highly-integrated and energy-efficient mMIMO base stations.

Energy Efficient Radar TX

In the next years, advanced driver assistance systems (ADAS) are expected to transform cars into securely-connected self-driving robots with the capability of sensing the environment, thinking, and acting autonomously. CRUISE facilitates transforming to this near era.

Projects history

High Power RF-DAC

This project investigates the next generation of high power RF-DACs and digital intensive receivers

Energy Efficient Wideband Transmitter, NXP Partnership ‘Advanced 5G Solutions’

This project providing enhanced average efficiency in wideband wireless transmitters while withstanding the changing load conditions that can occur in handheld devices and MIMO/smart-antenna communication systems.

smart Everything everywhere Access to content through Small cells Technologies

EAST is focused on the development of Small cell technologies for 5G applications up to 6 GHz

  1. A 4×Two-Way mm-Wave Doherty CMOS PA
    Kumaran, Anil Kumar; Wu, Yizhuo; Pashaeifar, Masoud; Nachouane, Hamza; Gao, Chang; Cornelis Nicolaas de Vreede, Leonardus; Alavi, Morteza S.;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 73, Issue 10, pp. 7482-7499, 2025. DOI: 10.1109/TMTT.2025.3569155
    Keywords: ... Impedance;Power combiners;Power amplifiers;Power generation;Bandwidth;Peak to average power ratio;Inductors;5G mobile communication;Capacitors;CMOS technology;Adaptive biasing;artificial intelligence (AI);compact;digital predistortion (DPD);Doherty;lumped components;millimeter-wave (mm-wave);power amplifier (PA);power combiner;three-stage;voltage standing wave ratio (VSWR).

  2. A Millimeter-Wave Power Amplifier With an Integrated CMOS Isolator/Circulator/Receiver
    Pashaeifar, Masoud; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    pp. 1-13, 2025. DOI: 10.1109/JSSC.2025.3570656
    Keywords: ... Full-duplex system;Phased arrays;Bandwidth;Isolators;Circulators;Antennas;Sensitivity;Power amplifiers;ISO;Power generation;Blocker-tolerant receiver (RX);circulator;CMOS;duplexer;fifth-generation (5G);frequency division duplex (FDD);full-duplex;gyrator;in-band full-duplex;isolator;millimeter-wave (mm-wave);mutual coupling;N-path filter;power amplifiers (PAs);voltage standing wave ratio (VSWR) resilience.

  3. 5.8 A 20W CMOS/LDMOS All-Digital Transmitter with Dynamic Retiming and Glitch-Free Phase Mapper, Achieving 68%/62% Peak Drain/System Efficiency
    Mul, Dieuwert Peter Nicolaas; Bootsman, Rob J; Beikmirza, Mohammadreza; El Boustani, Ossama; Shen, Yiyu; Maassen, Daniel; van Velzen, Bart; Rousstia, Mohadig; Koster, Ronald; Gajadharsing, John R; Fritzsch, Thomas; Alavi, Morteza; De Vreede, Leo C.N.;
    In 2025 IEEE International Solid-State Circuits Conference (ISSCC),
    pp. 104-106, 2025. DOI: 10.1109/ISSCC49661.2025.10904650
    Keywords: ... Base stations;Frequency modulation;Transmitters;Switches;Logic gates;Solid state circuits;Wideband;Signal resolution;Power generation;Switching circuits.

  4. The Efficiency and Power Utilization of Current-Scaling Digital Transmitters
    Mul, Dieuwert P. N.; Bootsman, Robert J.; Beikmirza, Mohammadreza; Alavi, Morteza S.; Vreede, Leo C. N. de;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 72, Issue 7, pp. 4350-4366, 2024. DOI: 10.1109/TMTT.2023.3336984
    Keywords: ... Switches;Radio frequency;Logic gates;Transmitters;Power generation;Loading;Power amplifiers;Current control;Peak to average power ratio;Current mode;current scaling;digital transmitter (DTX);Doherty;efficiency;multiphase;peak-to-average-power ratio (PAPR);polar;power utilization;RF-DAC;signed Cartesian (SC);upconversion.

  5. A Single-Supply Balun-First Three-Way mm-Wave Doherty PA
    Kumaran, Anil Kumar; Pashaeifar, Masoud; Alexanderson, Mats; Vreede, Leonardus Cornelis Nicolaas de; Alavi, Morteza S.;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 72, Issue 5, pp. 2757-2772, 2024. DOI: 10.1109/TMTT.2024.3365697
    Keywords: ... Inductors;Integrated circuit modeling;5G mobile communication;Capacitors;Bandwidth;Impedance;Peak to average power ratio;Compact;Doherty;lumped components;millimeter wave;Norton transformation;power amplifier (PA);three-stage.

  6. A Chain-Weaver Balanced Power Amplifier With an Embedded Impedance/Power Sensor
    Pashaeifar, Masoud; Kumar Kumaran, Anil; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    Volume 59, Issue 12, pp. 3938-3951, 2024. DOI: 10.1109/JSSC.2024.3453213
    Keywords: ... Gain;Linearity;Impedance;Power demand;Power amplifiers;Loading;Bandwidth;5G;amplitude-to-amplitude (AM-AM);amplitude-to-phase (AM-PM);balanced power amplifier;chain weaver;impedance sensor;mutual coupling;power amplifier (PA);power sensor;quadrature hybrid coupler;rms detector (DET);transmission line (TL);voltage standing wave ratio (VSWR);wideband.

  7. MP-DPD: Low-Complexity Mixed-Precision Neural Networks for Energy-Efficient Digital Predistortion of Wideband Power Amplifiers
    Wu, Yizhuo; Li, Ang; Beikmirza, Mohammadreza; Singh, Gagan Deep; Chen, Qinyu; de Vreede, Leo C. N.; Alavi, Morteza; Gao, Chang;
    IEEE Microwave and Wireless Technology Letters,
    Volume 34, Issue 6, pp. 817-820, 2024. DOI: 10.1109/LMWT.2024.3386330
    Keywords: ... Power demand;Quantization (signal);Neural networks;Logic gates;Energy efficiency;Wideband;Data models;Digital systems;Deep neural network (DNN);digital predistortion (DPD);digital transmitter (DTX);power amplifier (PA);quantization.

  8. 32.7 A 25.2dBm PSAT, 35-to-43GHz VSWR-Resilient Chain-Weaver Eight-Way Balanced PA with an Embedded Impedance/Power Sensor
    Pashaeifar, Masoud; Kumaran, Anil K.; De Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2024 IEEE International Solid-State Circuits Conference (ISSCC),
    pp. 532-534, 2024. DOI: 10.1109/ISSCC49657.2024.10454427
    Keywords: ... Time-frequency analysis;5G mobile communication;Transmitters;Linearity;Power amplifiers;Solid state circuits;Reliability.

  9. OpenDPD: An Open-Source End-to-End Learning & Benchmarking Framework for Wideband Power Amplifier Modeling and Digital Pre-Distortion
    Wu, Yizhuo; Singh, Gagan Deep; Beikmirza, Mohammadreza; de Vreede, Leo C. N.; Alavi, Morteza; Gao, Chang;
    In 2024 IEEE International Symposium on Circuits and Systems (ISCAS),
    pp. 1-5, 2024. DOI: 10.1109/ISCAS58744.2024.10558162
    Keywords: ... Codes;Transmitters;OFDM;Power amplifiers;Artificial neural networks;Documentation;Benchmark testing;digital pre-distortion;behavioral modeling;deep neural network;power amplifier;digital transmitter.

  10. A Wideband Energy-Efficient Multi-Mode CMOS Digital Transmitter
    Beikmirza, Mohammadreza; Shen, Yiyu; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    Volume 58, Issue 3, pp. 677-690, 2023. DOI: 10.1109/JSSC.2022.3222028
    Keywords: ... Radio frequency;Clocks;Baseband;Wideband;OFDM;Power generation;Mixers;Balun;Cartesian;CMOS;digital power amplifier (DPA);digital pre-distortion (DPD);digital transmitter (DTX);efficient;load insensitive class-E;Marchand;multi-phase;radio frequency digital-to-analog converter (RF-DAC);reactance compensation;re-entrant;wideband.

  11. A Wideband Digital-Intensive Current-Mode Transmitter Line-Up
    Shen, Yiyu; Hoogelander, Martijn; Bootsman, Rob; Alavi, Morteza S.; de Vreede, Leo C. N.;
    IEEE Journal of Solid-State Circuits,
    Volume 58, Issue 9, pp. 2489-2500, 2023. DOI: 10.1109/JSSC.2023.3279235
    Keywords: ... Radio frequency;Linearity;Power amplifiers;Harmonic analysis;Energy efficiency;Power generation;Impedance;Common-gate (CG)/common-base (CB) power amplifier (PA);current division path;digital pre-distortion (DPD)-free;direct-digital RF modulator (DDRM);dynamic biasing;harmonic rejection (HR);IQ-mapping;quadrature up-converter;radio frequency digital-to-analog converter (RFDAC);TX line-up.

  12. An Inverted Doherty Power Amplifier Insensitive to Load Variation With an Embedded Impedance Sensor in Its Output Power-Combining Network
    Singh, Gagan Deep; Nemati, Hossein Mashad; Alavi, Morteza S.; de Vreede, Leonardus Cornelis Nicolaas;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 71, Issue 12, pp. 5194-5208, 2023. DOI: 10.1109/TMTT.2023.3277081
    Keywords: ... Impedance;Bandwidth;Wideband;Power amplifiers;DC-DC power converters;Tunable circuits and devices;Phase shifters;DC--DC power converters;impedance sensor;inverted Doherty power amplifier (IDPA);load-insensitive power amplifiers (PAs);tunable phase shifter;tunable resonators (TRs).

  13. PA Output Power and Efficiency Enhancement Across the 2:1 VSWR Circle using Static Active Load Adjustment
    Singh, Gagan Deep; Nemati, Hossein Mashad; Alavi, Morteza S.; de Vreede, Leo C.N.;
    In 2023 IEEE/MTT-S International Microwave Symposium - IMS 2023,
    pp. 211-214, 2023. DOI: 10.1109/IMS37964.2023.10188045
    Keywords: ... Loading;Power amplifiers;Couplers;Microwave theory and techniques;Microwave amplifiers;Power generation;Power Amplifier;VSWR;Coupler;Gallium Nitrite (GaN);HEMT.

  14. A Low-Complexity Digital Predistortion Technique For Digital I/Q Transmitters
    Beikmirza, Mohammadreza; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2023 IEEE/MTT-S International Microwave Symposium - IMS 2023,
    pp. 787-790, 2023. DOI: 10.1109/IMS37964.2023.10187914
    Keywords: ... Microwave measurement;Constellation diagram;Transmitters;Bandwidth;Microwave theory and techniques;Predistortion;Digital pre-distortion;DPD;constellation;mapping;digital transmitter;RF-DAC.

  15. A 26GHz Balun-First Three-Way Doherty PA in 40nm CMOS with 20.7 dBm Psat and 20dB Power Gain
    Kumaran, Anil Kumar; Pashaeifar, Masoud; Nemati, Hossein Mashad; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2023 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 189-192, 2023. DOI: 10.1109/RFIC54547.2023.10186161
    Keywords: ... Power measurement;5G mobile communication;Radio transmitters;Power amplifiers;Radiofrequency integrated circuits;Frequency measurement;Scattering parameters;Doherty;3-stage Power amplifier;Compact;Millimeter wave;Lumped components;Norton transformation.

  16. A Millimeter-Wave CMOS Series-Doherty Power Amplifier With Post-Silicon Inter-Stage Passive Validation
    Pashaeifar, Masoud; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    Volume 57, Issue 10, pp. 2999-3013, 2022. DOI: 10.1109/JSSC.2022.3175685
    Keywords: ... Modulation;Impedance;Power generation;Bandwidth;5G mobile communication;Resonant frequency;Power combiners;Doherty power amplifier (DPA);impedance inverter;power amplifier (PA);root mean square (rms) detector;series-DPA (SDPA);transformer;wideband.

  17. Load-Modulation-Based IMD3 Cancellation for Millimeter-Wave Class-B CMOS Power Amplifiers Achieving EVM < 1.2%
    Pashaeifar, Masoud; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Microwave and Wireless Components Letters,
    Volume 32, Issue 6, pp. 716-719, 2022. DOI: 10.1109/LMWC.2022.3166257
    Keywords: ... Modulation;OFDM;Power generation;Logic gates;Linearity;5G mobile communication;Wireless communication;5G New Radio (NR);Doherty;intermodulation distortion;load modulation;millimeter-wave;power amplifiers (PAs).

  18. High-Power Digital Transmitters for Wireless Infrastructure Applications (A Feasibility Study)
    Bootsman, Robert J.; Mul, Dieuwert P. N.; Shen, Yiyu; Hashemi, Mohsen; Heeres, Rob M.; van Rijs, Fred; Alavi, Morteza S.; de Vreede, Leo C. N.;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 70, Issue 5, pp. 2835-2850, 2022. DOI: 10.1109/TMTT.2022.3153000
    Keywords: ... Radio frequency;CMOS technology;Power generation;Logic gates;Transmitters;Threshold voltage;Switches;Class-E;CMOS;digital predistortion (DPD);digital transmitter (DTX);efficient;GaN;high-power RF;laterally-diffused MOS (LDMOS);mixing power digital-to-analog converter (DAC);polar.

  19. A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters
    Shen, Yiyu; Bootsman, Robert; Alavi, Morteza S.; de Vreede, Leo C. N.;
    IEEE Journal of Solid-State Circuits,
    Volume 57, Issue 5, pp. 1446-1456, 2022. DOI: 10.1109/JSSC.2022.3144362
    Keywords: ... Radio frequency;Modulation;Computer architecture;Power generation;Microprocessors;Delays;Clocks;Current-steering digital-to-analog converter (DAC);digital pre-distortion (DPD)-free;digital-intensive transmitter (DTX);direct-digital RF modulator (DDRM);I/Q image;IQ-mapping;mixing DAC;PA pre-driver;quadrature up-converter;radio-frequency digital-analog converter (RFDAC).

  20. A Low-Spur Fractional-N PLL Based on a Time-Mode Arithmetic Unit
    Gao, Zhong; He, Jingchu; Fritz, Martin; Gong, Jiang; Shen, Yiyu; Zong, Zhirui; Chen, Peng; Spalink, Gerd; Eitel, Ben; Alavi, Morteza S.; Staszewski, Robert Bogdan; Babaie, Masoud;
    IEEE Journal of Solid-State Circuits,
    pp. 1-20, 2022. DOI: 10.1109/JSSC.2022.3209338

  21. A Load Insensitive Doherty Power Amplifier with better than −39dBc ACLR on 2:1 VSWR Circle using a Constant 50 Ω Trained Pre-distorted Signal
    Singh, Gagan Deep; Mul, Dieuwert; Nemati, Hossein Mashad; Alavi, Morteza S.; de Vreede, Leo C.N.;
    In 2022 52nd European Microwave Conference (EuMC),
    pp. 222-225, 2022. DOI: 10.23919/EuMC54642.2022.9924452
    Keywords: ... Phased arrays;Printed circuits;Power amplifiers;Prototypes;Load management;Telephone sets;Microwave circuits;self-healing transmitter;VSWR;control circuit;Doherty;six-port reflectometers;tunable matching networks.

  22. A 39 W Fully Digital Wideband Inverted Doherty Transmitter
    Bootsman, Robert; Shen, Yiyu; Mul, Dieuwert; Rousstia, Mohadig; Heeres, Rob; van Rijs, Fred; Gajadharsing, John; Alavi, Morteza S.; de Vreede, Leo C.N.;
    In 2022 IEEE/MTT-S International Microwave Symposium - IMS 2022,
    pp. 979-982, 2022. DOI: 10.1109/IMS37962.2022.9865405
    Keywords: ... Radio frequency;Power demand;Three-dimensional displays;Transmitters;Power combiners;Power system harmonics;Harmonic analysis;digital transmitters;LDMOS;CMOS;inverted Doherty;wideband.

  23. A Wideband Two-Way Digital Doherty Transmitter in 40nm CMOS
    Beikmirza, Mohammadreza; Shen, Yiyu; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2022 IEEE/MTT-S International Microwave Symposium - IMS 2022,
    pp. 975-978, 2022. DOI: 10.1109/IMS37962.2022.9865506
    Keywords: ... Transmitters;Power combiners;OFDM;Power amplifiers;Microwave amplifiers;Wideband;Power generation;Cartesian;class-E;Doherty;efficient;wideband;digital power amplifier;RF-DAC;DPD;DTX;Balun;CMOS.

  24. A Millimeter-Wave Front-End for FD/FDD Transceivers Featuring an Embedded PA and an N-Path Filter Based Circulator Receiver
    Pashaeifar, Masoud; De Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 11-14, 2022. DOI: 10.1109/RFIC54546.2022.9863209
    Keywords: ... Wireless communication;Circulators;Power amplifiers;Insertion loss;Transmission line measurements;Transceivers;Radiofrequency integrated circuits;Blocker-tolerant receiver;CMOS circulator;FDD;full-duplex;mm-wave;N-path filter;power amplifiers.

  25. A 1-to-4GHz Multi-Mode Digital Transmitter in 40nm CMOS Supporting 200MHz 1024-QAM OFDM signals with more than 23dBm/66% Peak Power/Drain Efficiency
    Beikmirza, Mohammadreza; Shen, Yiyu; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2022 IEEE Custom Integrated Circuits Conference (CICC),
    pp. 01-02, 2022. DOI: 10.1109/CICC53496.2022.9772797
    Keywords: ... Transmitters;OFDM;Modulation;Nanoscale devices;Energy efficiency;Delays;Synchronization.

  26. A 1.66Gb/s and 5.8pJ/b Transcutaneous IR-UWB Telemetry System with Hybrid Impulse Modulation for Intracortical Brain-Computer Interfaces
    Song, Minyoung; Huang, Yu; Shen, Yiyu; Shi, Chengyao; Breeschoten, Arjan; Konijnenburg, Mario; Visser, Huib; Romme, Jac; Dutta, Barundeb; Alavi, Morteza S.; Bachmann, Christian; Liu, Yao-Hong;
    In 2022 IEEE International Solid- State Circuits Conference (ISSCC),
    pp. 394-396, 2022. DOI: 10.1109/ISSCC42614.2022.9731608

  27. A 2.6-to-4.1GHz Fractional-N Digital PLL Based on a Time-Mode Arithmetic Unit Achieving -249.4dB FoM and -59dBc Fractional Spurs
    Gao, Zhong; He, Jingchu; Fritz, Martin; Gong, Jiang; Shen, Yiyu; Zong, Zhirui; Chen, Peng; Spalink, Gerd; Eitel, Ben; Yamamoto, Ken; Staszewski, Robert Bogdan; Alavi, Morteza S.; Babaie, Masoud;
    In 2022 IEEE International Solid- State Circuits Conference (ISSCC),
    pp. 380-382, 2022. DOI: 10.1109/ISSCC42614.2022.9731561

  28. A DPLL-Based Phase Modulator Achieving -46dB EVM with A Fast Two-Step DCO Nonlinearity Calibration and Non-Uniform Clock Compensation
    Gao, Zhong; Fritz, Martin; He, Jingchu; Spalink, Gerd; Staszewski, Robert Bogdan; Alavi, Morteza S.; Babaie, Masoud;
    In 2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits,
    pp. 14-15, 2022. DOI: 10.1109/VLSITechnologyandCir46769.2022.9830398

  29. Compact N-Way Doherty Power Combiners for mm-wave 5G Transmitters
    Kumaran, Anil Kumar; Nemati, Hossein Mashad; De Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2022 IEEE International Symposium on Circuits and Systems (ISCAS),
    pp. 438-442, 2022. DOI: 10.1109/ISCAS48785.2022.9937619
    Keywords: ... Q-factor;Power combiners;Transmitters;5G mobile communication;Layout;Metals;Bandwidth;Doherty;Power amplifier;Transmission line;Lumped-element;Peak-to-average power ratio..

  30. A Wideband Four-Way Doherty Bits-In RF-Out CMOS Transmitter
    Beikmirza, Mohammadreza; Shen, Yiyu; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    Volume 56, Issue 12, pp. 3768-3783, 2021. DOI: 10.1109/JSSC.2021.3105542
    Keywords: ... Clocks;OFDM;Logic gates;Wideband;Constellation diagram;Baseband;Timing;50%-LO clock distribution;8-shape inductor/balun;current-mode class-D (CMCD);efficiency enhancement;in-phase/quadrature (I/Q) interleaving;radio frequency digital-to-analog converter (RF-DAC);sign-bit.

  31. A Millimeter-Wave Mutual-Coupling-Resilient Double-Quadrature Transmitter for 5G Applications
    Pashaeifar, Masoud; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    Volume 56, Issue 12, pp. 3784-3798, 2021. DOI: 10.1109/JSSC.2021.3111126
    Keywords: ... 5G mobile communication;Quadrature amplitude modulation;Antennas;Phase modulation;Mixers;Transmitters;Power generation;Balanced power amplifier (PA);calibration free;direct upconverter;double-quadrature;image-rejection ratio (IRR);mutual-coupling;series-Doherty PA;transmitter (TX).

  32. 14.4 A 24-to-30GHz Double-Quadrature Direct-Upconversion Transmitter with Mutual-Coupling-Resilient Series-Doherty Balanced PA for 5G MIMO Arrays
    Pashaeifar, Masoud; de Vreede, Leo C. N.; Alavi, Morteza S.;
    In 2021 IEEE International Solid-State Circuits Conference (ISSCC),
    pp. 223-225, 2021. DOI: 10.1109/ISSCC42613.2021.9365776
    Keywords: ... 5G mobile communication;Transmitters;Robustness;Solid state circuits;Loaded antennas;Tuning;Time-varying systems.

  33. 6.2 A 4-Way Doherty Digital Transmitter Featuring 50%-LO Signed IQ Interleave Upconversion with more than 27dBm Peak Power and 40% Drain Efficiency at 10dB Power Back-Off Operating in the 5GHz Band
    Beikmirza, Mohammadreza; Shen, Yiyu; Mehrpoo, Mohammadreza; Hashemi, Mohsen; Mul, Dieuwert; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2021 IEEE International Solid-State Circuits Conference (ISSCC),
    pp. 92-94, 2021. DOI: 10.1109/ISSCC42613.2021.9365831
    Keywords: ... Wireless communication;Transmitters;Peak to average power ratio;Nanoscale devices;Solid state circuits;Wideband;Standards.

  34. Efficiency and Linearity of Digital "Class-C Like" Transmitters
    Mul, Dieuwert P.N.; Bootsman, Rob J.; Bruinsma, Quinten; Shen, Yiyu; Krause, Sebastian; Quay, Rüdiger; Pelk, Marco J.; van Rijs, Fred; Heeres, Rob M.; Pires, Sergio; Alavi, Morteza; de Vreede, Leo C.N.;
    In 2020 50th European Microwave Conference (EuMC),
    pp. 1-4, 2021. DOI: 10.23919/EuMC48046.2021.9338122
    Keywords: ... Transmitters;Impedance matching;Power amplifiers;Linearity;Energy efficiency;Power generation;Next generation networking;Class-C;digital transmitter;efficiency;linearity;LDMOS;CMOS RFIC;polar transmitter;RFDAC;digital power amplifier.

  35. On-Chip Output Stage Design for a Continuous Class-F Power Amplifier
    Kumaran, Anil Kumar; Pashaeifar, Masoud; D’Avino, Marco; de Vreede, Leo C. N.; Alavi, Morteza S.;
    In 2021 IEEE International Symposium on Circuits and Systems (ISCAS),
    pp. 1-5, 2021. DOI: 10.1109/ISCAS51556.2021.9401788
    Keywords: ... Radio frequency;Layout;Power amplifiers;Power system harmonics;Harmonic analysis;System-on-chip;Inductors;Continuous class F (CCF);Output matching network;Power amplifier (PA);Harmonic termination;Differential-mode analysis;Common-mode analysis.

  36. A 24-to-32GHz series-Doherty PA with two-step impedance inverting power combiner achieving 20.4dBm Psat and 38%/34% PAE at Psat/6dB PBO for 5G applications
    Pashaeifar, Masoud; Kumaran, Anil K.; Beikmirza, Mohammadreza; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2021 IEEE Asian Solid-State Circuits Conference (A-SSCC),
    pp. 1-3, 2021. DOI: 10.1109/A-SSCC53895.2021.9634772
    Keywords: ... Power transmission lines;5G mobile communication;Power combiners;Broadband amplifiers;Transmitters;Modulation;Throughput.

  37. A Versatile and Efficient 0.1-to-11 Gb/s CML Transmitter in 40-nm CMOS
    Feng, Jun; Beikmirza, Mohammadreza; Mehrpoo, Mohammadreza; de Vreede, Leo C.N.; Alavi, Morteza S.;
    In 2021 18th International SoC Design Conference (ISOCC),
    pp. 41-42, 2021. DOI: 10.1109/ISOCC53507.2021.9613887
    Keywords: ... Transmitters;Bit error rate;Prototypes;Frequency division multiplexing;Frequency synchronization;Standards;Clocks.

  38. An 18.5 W Fully-Digital Transmitter with 60.4 % Peak System Efficiency
    Bootsman, R.J.; Mul, D.P.N.; Shen, Y.; Heeres, R.M.; van Rijs, F.; Alavi, M.S.; de Vreede, L.C.N.;
    In 2020 IEEE/MTT-S International Microwave Symposium (IMS),
    pp. 1113-1116, 2020. DOI: 10.1109/IMS30576.2020.9223942
    Keywords: ... Radio frequency;Microwave measurement;Thermometers;Power measurement;Transmitters;Power amplifiers;Prototypes;Digital transmitter;CMOS RFIC;LDMOS;polar transmitter;digital pre-distortion (DPD);power RFDAC;digital power amplifier.

  39. A 1–3 GHz I/Q Interleaved Direct-Digital RF Modulator As A Driver for A Common-Gate PA in 40 nm CMOS
    Shen, Yiyu; Bootsman, Rob; Alavi, Morteza S.; de Vreede, Leo C.N.;
    In 2020 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 287-290, 2020. DOI: 10.1109/RFIC49505.2020.9218324
    Keywords: ... Harmonic analysis;IP networks;Radio frequency;Clocks;Modulation;Computer architecture;Microprocessors;DDRM;PA driver;RF-DAC;CG PA;IQ-Interleaving;harmonic rejection;dynamic biasing;DPD-free.

  40. A 0.5-3 GHz I/Q Interleaved Direct-Digital RF Modulator with up to 320 MHz Modulation Bandwidth in 40 nm CMOS
    Shen, Yiyu; Bootsman, Rob; Alavi, Morteza S.; de Vreede, Leonardus;
    In 2020 IEEE Custom Integrated Circuits Conference (CICC),
    pp. 1-4, 2020. DOI: 10.1109/CICC48029.2020.9075949
    Keywords: ... Modulation;Bandwidth;Radio frequency;Computer architecture;Clocks;Distortion;Power generation;DDRM;RFDAC;quadrature up-converter;IQ-Mapping;Digital-Intensive Transmitter;DPD-free.

  41. Bits-In RF-Out Transmitters
    Morteza S. Alavi; Leo de Vreede,;
    In IEEE Radio Frequency Integrated Circuits (RFIC) Symposium Workshop,
    2019.

  42. A Wideband Linear $I/Q$ -Interleaving DDRM
    Mehrpoo, Mohammadreza; Hashemi, Mohsen; Shen, Yiyu; de Vreede, Leo C. N.; Alavi, Morteza S.;
    IEEE Journal of Solid-State Circuits,
    Volume 53, Issue 5, pp. 1361-1373, 2018. DOI: 10.1109/JSSC.2017.2786685
    Keywords: ... Radio frequency;Linearity;Modulation;Switches;Wideband;Transient analysis;Carrier aggregation (CA);counter-intermodulation (C-IM);direct-digital RF modulator (DDRM);harmonic rejection (HR);IQ-interleaving;RF digital-to-analog converter (DAC);second-order hold (SOH).

  43. Quasi-load insensitive class-E for Doherty and Outphasing Transmitters
    Leo de Vreede; Morteza S. Alavi;
    In IEEE MTT-S International Microwave Symposium (IMS), Workshop,
    2018.

  44. Pushing the Linearity Limits of a Digital Polar Transmitter
    Hashemi, Mohsen; Alavi, Morteza S.; De Vreede, Leo C.N.;
    In 2018 13th European Microwave Integrated Circuits Conference (EuMIC),
    pp. 174-177, 2018. DOI: 10.23919/EuMIC.2018.8539964
    Keywords: ... Table lookup;OFDM;Quantization (signal);Mathematical model;Radio frequency;Linearity;Convergence;Digital polar transmitter;DPD;quantization noise;RF - DAC;sampling spectral replica.

  45. A Wideband I/Q RFDAC-Based Phase Modulator
    Yiyu Shen; Michael Polushkin; Mohammad Reza Mehrpoo; Mohsen Hashemi; Earl McCune; Morteza S. Alavi; Leo C. N. de Vreede,;
    In (accepted RWS 2018).,
    2018.

  46. Bits-In / RF-Out Transmitters for 5G mMIMO
    Leo de Vreede; Morteza S. Alavi;
    In IEEE European Microwave Week (EuMIC) Workshop,
    2018.

  47. A wideband I/Q RFD AC-based phase modulator
    Shen, Yiyu; Polushkin, Michael; Mehrpoo, Mohammadreza; Hashemi, Mohsen; McCune, Earl; Alavi, Morteza S.; de Vreede, Leo C. N.;
    In 2018 IEEE 18th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF),
    pp. 8-11, 2018. DOI: 10.1109/SIRF.2018.8304215
    Keywords: ... Phase modulation;Power harmonic filters;Frequency modulation;Harmonic analysis;Wideband;Band-pass filters;Phase measurement;Phase modulator;RFDAC;wideband;frequency-agile;harmonic rejection.

  48. An Intrinsically Linear Wideband Polar Digital Power Amplifier
    Hashemi, Mohsen; Shen, Yiyu; Mehrpoo, Mohammadreza; Alavi, Morteza S.; de Vreede, Leo C. N.;
    IEEE Journal of Solid-State Circuits,
    Volume 52, Issue 12, pp. 3312-3328, 2017. DOI: 10.1109/JSSC.2017.2737647
    Keywords: ... Harmonic analysis;Power amplifiers;Linearity;Power generation;Transistors;Switches;Integrated circuit modeling;Class-E/F2;digital power amplifier (DPA);digital pre-distortion (DPD)-less;efficient;linear;multiphase RF clocking;nonlinear sizing;overdrive-voltage control;wideband.

  49. 17.5 An intrinsically linear wideband digital polar PA featuring AM-AM and AM-PM corrections through nonlinear sizing, overdrive-voltage control, and multiphase RF clocking
    Hashemi, Mohsen; Shen, Yiyu; Mehrpoo, Mohammadreza; Acar, Mustafa; van Leuken, René; Alavi, Morteza S.; de Vreede, Leonardus;
    In 2017 IEEE International Solid-State Circuits Conference (ISSCC),
    pp. 300-301, 2017. DOI: 10.1109/ISSCC.2017.7870380
    Keywords: ... Radio frequency;Clocks;Power amplifiers;Linearity;Tuning;Delays;Wideband.

  50. A wideband linear direct digital RF modulator using harmonic rejection and I/Q-interleaving RF DACs
    Mehrpoo, M.; Hashemi, M.; Shen, Y.; van Leuken, R.; Alavi, M. S.; de Vreede, L. C. N.;
    In 2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 188-191, 2017. DOI: 10.1109/RFIC.2017.7969049
    Keywords: ... Radio frequency;Harmonic analysis;Modulation;Baseband;Wideband;Linearity;Clocks;RF DAC;direct digital RF modulator;harmonic rejection;2nd-order-hold;carrier aggregation;LTE.

  51. A fully-integrated digital-intensive polar Doherty transmitter
    Shen, Yiyu; Mehrpoo, Mohammadreza; Hashemi, Mohsen; Polushkin, Michael; Zhou, Lei; Acar, Mustafa; van Leuken, Rene; Alavi, Morteza S.; de Vreede, Leo;
    In 2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 196-199, 2017. DOI: 10.1109/RFIC.2017.7969051
    Keywords: ... Phase modulation;System-on-chip;Baseband;Transmitters;Topology;Clocks;Power generation;Doherty transmitter;digital-intensive polar;efficiency enhancement;DPD;phase modulator;on-chip combiner.

  52. A 5.9 GHz RFDAC-based outphasing power amplifier in 40-nm CMOS with 49.2% efficiency and 22.2 dBm power
    Hu, Zhebin; de Vreede, Leo C.N.; Alavi, Morteza S.; Calvillo-Cortes, David A.; Staszewski, Robert Bogdan; He, Songbai;
    In 2016 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 206-209, 2016. DOI: 10.1109/RFIC.2016.7508287
    Keywords: ... CMOS integrated circuits;Modulation;Power generation;Switches;Loading;Dynamic range;Bandwidth;Outphasing power amplifier;Class-E;CMOS power amplifier;Chireix combiner;RFDAC.

  53. A Wideband 2$\times$ 13-bit All-Digital I/Q RF-DAC
    Alavi, Morteza S.; Staszewski, Robert Bogdan; de Vreede, Leo C. N.; Long, John R.;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 62, Issue 4, pp. 732-752, 2014. DOI: 10.1109/TMTT.2014.2307876
    Keywords: ... Radio frequency;Modulation;Clocks;Baseband;Switches;Power generation;Noise;Balun;class-E power amplifier;digital power amplifier (DPA);digital predistortion (DPD);digital-to-RF-amplitude converter (DRAC);in-phase/quadrature-phase (I/Q) modulator;MOS switch;RF digital-to-analog converter (RF-DAC);transformer;transmitter (TX).

  54. All-Digital I/Q RF-DAC
    S. M. Alavi;
    PhD thesis, Delft University of Technology, http://doi.org/10.4233/uuid:fd7dec40-1957-4aad-bb24-90d6f40b5268, 06 2014. Promotor: R.B. Staszewski.

  55. A 2×13-bit all-digital I/Q RF-DAC in 65-nm CMOS
    Alavi, Morteza S.; Voicu, George; Staszewski, Robert B.; de Vreede, Leo C. N.; Long, John R.;
    In 2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 167-170, 2013. DOI: 10.1109/RFIC.2013.6569551
    Keywords: ... Radio frequency;Power generation;Clocks;Frequency modulation;Transmitters;Baseband.

  56. All-Digital RF $I/Q$ Modulator
    Alavi, Morteza S.; Staszewski, Robert Bogdan; de Vreede, Leo C. N.; Visweswaran, Akshay; Long, John R.;
    IEEE Transactions on Microwave Theory and Techniques,
    Volume 60, Issue 11, pp. 3513-3526, 2012. DOI: 10.1109/TMTT.2012.2211612
    Keywords: ... Switches;Radio frequency;Modulation;Clocks;Power generation;Bandwidth;Radio transmitters;Balun;class-E power amplifier;digital power amplifier (DPA);digital-to-RF-amplitude converter (DRAC);in-phase/quadrature ($I/Q$) modulator;MOS switch;RF digital-to-analog converter (RF-DAC);transformer;transmitter.

  57. A 2-GHz digital I/Q modulator in 65-nm CMOS
    Alavi, Morteza S.; Visweswaran, Akshay; Staszewski, Robert B.; de Vreede, Leo C.N; Long, John R.; Akhnoukh, Atef;
    In IEEE Asian Solid-State Circuits Conference 2011,
    pp. 277-280, 2011. DOI: 10.1109/ASSCC.2011.6123565
    Keywords: ... Modulation;Clocks;Power generation;Radio frequency;Arrays;Transistors;CMOS integrated circuits.

  58. Orthogonal summing and power combining network in a 65-nm all-digital RF I/Q modulator
    Alavi, Morteza S.; Staszewski, Robert B.; de Vreede, Leo C. N.; Long, John R.;
    In 2011 IEEE International Symposium on Radio-Frequency Integration Technology,
    pp. 21-24, 2011. DOI: 10.1109/RFIT.2011.6141758
    Keywords: ... Modulation;Switches;Radio frequency;Power generation;Arrays;CMOS integrated circuits;Baseband.

  59. Efficient LDMOS device operation for envelope tracking amplifiers through second harmonic manipulation
    Alavi, Morteza. S.; van Rijs, Fred; Marchetti, Mauro; Squillante, Michele; Zhang, Tao; Theeuwen, Steven J.C.H.; Volokhine, Yuri; Jos, H.F.F.; Heijden, Mark P. v. d.; Acar, Mustafa; de Vreede, Leo C.N.;
    In 2011 IEEE MTT-S International Microwave Symposium,
    pp. 1-4, 2011. DOI: 10.1109/MWSYM.2011.5972665

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Last updated: 6 Aug 2025

Morteza Alavi

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