Christian Fager
Christian Fager received his Ph.D. degree from Chalmers University of Technology, Sweden, in 2003. He became Full Professor at the same university in 2019 and is currently Head of the Microwave Electronics Laboratory. Dr. Fager is an IEEE Fellow and currently serves as Associate Editor of IEEE Microwave Magazine and also as a member of the MTT-S technical coordination committee on Wireless Communications. Dr. Fager is Board of Directors member of the European Microwave Association (EuMA). He has served as chair/co-chair of the 2020 & 2021 IEEE Topical Conferences on RF/microwave Power Amplifiers and also TPC co-chair for the 2020 European Microwave Integrated Circuits Conference.
Dr. Fager is performing research that spans from nonlinear transistor modeling, energy efficient power amplifier and transmitter architectures, nonlinear distortion analysis and behavioral modeling, digital pre-distortion linearization, nonlinear and wideband measurement techniques, to digital radio-over-fiber solutions for distributed MIMO systems. He is co-inventor of 8 patents/patent applications and published more than 250 papers in refereed international journals and conferences. He also co-authored the book: Nonlinear Transistor Model Parameter Extraction Techniques (Cambridge University Press, 2011).
Dr. Fager received Chalmers Supervisor of the Year Award in 2018, the inaugural Chalmers Area of Advance Award in 2010, and the IEEE International Microwave Symposium Best Student Paper Award in 2002.
Showing 272 publications
On the Implementation of Capacitance Models in Electronic Computer-Aided Design Tools
A Ka-Band Doherty-Like Non-Load Modulated Power Amplifier
Sigma-Delta-Over-Fiber With WDM Serial Connection for Distributed MIMO
Over-the-Air Linearization of Phased Array Transmitters Affected by Load Modulation
AI-Assisted Deep-Learning-Based Design of High-Efficiency Class F Power Amplifiers
K/Ka-Band Eight-Way Power-Combined Power Amplifier in 180 nm E-Mode GaAs
EVM Analysis of Distributed Massive MIMO with 1-Bit Radio-Over-Fiber Fronthaul
6G Radio Testbeds: Requirements, Trends, and Approaches
56% PAE mm-Wave SiGe BiCMOS Power Amplifier Employing Local Backside Etching
A GaN MMIC Wideband Continuous-Mode Doherty Power Amplifier for 6G FR3 cmWave Applications
Recent Developments in Active Load Modulation PA Architectures
A Wideband 60-100 GHz GaAs Low-Noise Amplifier as a Pre-Amplifier to a CMOS Receiver
A TDD Distributed MIMO Testbed Using a 1-bit Radio-Over-Fiber Fronthaul Architecture
Deep-Learning-Based Channel Estimation for Distributed MIMO with 1-bit Radio-Over-Fiber Fronthaul
W-band Distributed Antenna System Using Low-Pass Sigma-Delta-over-Fiber
Analysis and Design of RF-Input Doherty-Like Circulator Load Modulated Amplifier
Mm-wave Distributed MIMO Radio-over-Fiber Communication Architecture Using Sigma-Delta Modulation
Wideband mm-wave 6 × 2 Distributed MIMO Transmitter using Sigma-Delta-over-Fiber
Dual-Band Dual-Output Doherty Power Amplifier for Unsynchronized Time-Division Duplexing
Enhancement of Power-Added Efficiency in GaAs Power Amplifiers by Dynamic Gate Biasing
Wideband mm-wave Spectrum-Efficient Transmitter Using Low-Pass Sigma–Delta-Over-Fiber Architecture
Symmetrical Doherty Power Amplifier with High Efficiency and Extended Bandwidth
Improved Digital Predistortion for Concurrent Multiband Transmission Using Frequency Relocation
Dual-Band Dual-Output Four-Way Doherty Power Amplifier for Unsynchronized Time-Division Duplexing
Design and Validation of a Concurrent Dual-Band 1.84/2.65 GHz GaN Doherty Power Amplifier
VNA-Based Large-Signal Drain-Modulated Power Amplifier Measurement Setup With Digital Pre-Distortion
Multilevel Outphasing With Over-the-Air Combining in Large Antenna Arrays
A Wideband and Highly Efficient Circulator Load Modulated Power Amplifier Architecture
Flexible Mm-Wave Sigma-Delta-Over-Fiber MIMO Link
TX Beamforming EVM Performance of a 65 dBm-EIRP Slant-Polarized Gapwaveguide Phased Array at 28 GHz
Investigation of Fiber Length Differences in Distributed MIMO Sigma-Delta-over-Fiber Systems
Design of a Compact GaN Power Amplifier with High Efficiency and Beyond Decade Bandwidth
Comparison of Co-located and Distributed MIMO for Indoor Wireless Communication
Localization With Distributed MIMO Using a High-Speed Sigma-Delta-Over-Fiber Testbed
A Generic Theory for Design of Efficient Three-stage Doherty Power Amplifiers
A third order analogue pre-distorter MMIC for E-band PA linearisation
Algorithmic Radar, a Novel Low-Power Architecture for High-Accuracy PMCW Radar
Multi-Stage Gate Modulation of E-Band MMIC Power Amplifier for Efficiency Improvement
FORMAT: A Reconfigurable Tile-Based Antenna Array System for 5G and 6G Millimeter-Wave Testbeds
Complexity Optimized Digital Predistortion Model of RF Power Amplifiers
Wideband Sequential Circulator Load Modulated Amplifier with Back-off Efficiency Enhancement
RF PA Predistortion using Non-Linear RF-DACs
Infinite Impulse Response Structure for Amplifier Modeling and Linearization
Investigation of power amplifier performance under load mismatch conditions
A Real-Valued 4D Memory Polynomial Algorithm for Mixer Modeling
Amplitude Varying Phased Array Linearization
Evaluation of Simultaneous Wireless Information and Power Transfer with Distributed Antennas
E/W-Band CPW-based Amplifier MMICs Fabricated in a 60 nm GaN-on-Silicon Foundry Process
Millimeter-Wave Power Amplifier Integrated Circuits for High Dynamic Range Signals
A W-Band Single-Chip Receiver in a 60 nm GaN-on-Silicon Foundry Process
Circulator Load Modulated Amplifier: A Non-Reciprocal Wideband and Efficient PA Architecture
Implementation challenges and opportunities in beyond-5G and 6G communication
Analyzing the Back-Gating Effect in GaN HEMTs with Field-Plates Using an Empirical Trap Model
Emulation of Load Modulated Amplifiers Using Tabulated Load-Pull Data from a Single Amplifier
Automatic Distributed MIMO Testbed for beyond 5G Communication Experiments
Doherty Load Modulation Based on Non-Reciprocity
A 2x6b 8GS/s 17-24GHz I/Q RF-DAC based Transmitter in 22nm FDSOI CMOS
Welcome to the 15th European Microwave Integrated Circuits Conference
Antenna Systems for 5G mm-Wave Radio Access
Thermal analysis of GaN/SiC-on-Si assemblies: Effect of bump pitch and thickness of SiC Layer
IC Design Aspects for 5G mm-Wave Systems
Performance simulation of a 5G hybrid beamforming millimeter-wave system
Hybrid Beamforming Transmitter Modeling for Millimeter-Wave MIMO Applications
Emulation of Doherty Amplifiers Using Single- Amplifier Load-Pull Measurements
A Wideband and Low-Loss Spatial Power Combining Module for mm-Wave High-Power Amplifiers
Distributed Massive MIMO via all-Digital Radio Over Fiber
Effect of VCSEL Characteristics on Ultra-High Speed Sigma-Delta-Over-Fiber Communication Links
Intra-Array Coupling Estimation for MIMO Transceivers Utilizing Blind Over-The-Air Measurements
Augmented Hammerstein model for the calibration of six-port based dual band wireless receivers
Single Digital Predistortion Technique for Phased Array Linearization
Evaluation of Distributed MIMO Communication Using a Low-Complexity Sigma-Delta-over-Fiber Testbed
Reducing Motion Artifacts in Microwave-Based Hemorrhagic Stroke Detection
Massive MU-MIMO-OFDM uplink with direct RF-sampling and 1-Bit ADCs
Thermal characteristics of vertically-integrated GaN/SiC-on-Si assemblies: A comparative study
Combiner synthesis for active load-modulationbased power amplifiers
Improvement of AM-PM in a 33-GHz CMOS SOI Power Amplifier Using pMOS Neutralization
A Low-Complexity Distributed-MIMO Testbed Based on High-Speed Sigma-Delta-Over-Fiber
A Flexible Multi-Gbps Transmitter Using Ultra-High Speed Sigma- Delta-over- Fiber
A Generalized 3-dB Wilkinson Power Divider/Combiner With Complex Terminations
Investigations of Active Antenna Doherty Power Amplifier Modules Under Beam-Steering Mismatch
Modeling and Linearization of Multi-Antenna Transmitters Using Over-the-Air Measurements
Accurate Modeling of GaN HEMT RF Behavior Using an Effective Trapping Potential
Lower Bound for the Normalized Mean Square Error in Power Amplifier Linearization
RF Front-End Circuits and Architectures for IoT/LTE-A/5G Connectivity
Design Considerations and Evaluation of a High-Speed SAR ADC
Characterization of linear power amplifiers for LTE applications
Analysis of Thermal Effects in Integrated Radio Transmitters
Digital Predistortion for Multi-Antenna Transmitters Affected by Antenna Crosstalk
Design and Large-Signal Characterization of High-Power Varactor-Based Impedance Tuners
Analysis and Design of a Doherty-Like RF-Input Load Modulated Balanced Amplifier
Driver Topologies for RF Doherty Power Amplifiers
Prediction of Nonlinear Distortion in Wideband Active Antenna Arrays
Vector-corrected Nonlinear Multi-port IQ-mixer Characterization using Modulated Signals
Analysis of thermal coupling effects in integrated MIMO transmitters
Analysis of nonlinear distortion in phased array transmitters
Design of linear and efficient power amplifiers by generalization of the Doherty theory
Efficient Millimeter Wave Doherty PA Design Based on a Low-Loss Combiner Synthesis Technique
A Generalized Combiner Synthesis Technique for Class-E Outphasing Transmitters
Digital Predistortion Parameter Identification for RF Power Amplifiers Using Real-Valued Output Data
Digital Predistorter Model Derivation Based on Iterative Learning Control
Accurate Circuit Characterization Methods for mm‐Wave 5G Systems
Symmetrical Doherty Power Amplifier With Extended Efficiency Range
A Doherty Power Amplifier Design Method for Improved Efficiency and Linearity
Wideband RF characterization setup with high dynamic range low frequency measurement capabilities
Current scaled Doherty amplifier for high efficiency and high linearity
Iterative Learning Control for RF Power Amplifier Linearization
Structured Digital Predistorter Model Derivation Based on Iterative Learning Control
Outphasing combiner synthesis from transistor load pull data
A class-J power amplifier with varactor-based dynamic load modulation across a large bandwidth
WebLab: A Web-Based Setup for PA Digital Predistortion and Characterization
Symmetry based nonlinear model for GaN HEMTs
A new variant of the indirect learning architecture for the linearization of power amplifiers
An Oscilloscope Correction Method for Vector-Corrected RF Measurements
Symmetry based Nonlinear Model for GaN
Optimized Design of a Dual-Band Power Amplifier With SiC Varactor-Based Dynamic Load Modulation
Linearization of Difficult Cases - MIMO, GaN and Deep Compression
Design Method for Quasi-Optimal Multiband Branch-Line Couplers
Efficient and Wideband Power Amplifiers for Wireless Infrastructure Applications
Scalability Analysis and Modeling of Future Massive MIMO Antenna Array Systems
On the Impact of Hardware Impairments on Massive MIMO
A GaN MMIC Modified Doherty PA With Large Bandwidth and Reconfigurable Efficiency
Efficiency optimization for phase controlled multi-source microwave oven
Prediction of smart antenna transmitter characteristics using a new behavioral modeling approach
Digital predistortion of concurrent multiband communication systems
Symmetrical doherty amplifier with high efficiency over large output power dynamic range
Linearization of dual-input Doherty power amplifiers
Symmetrical modeling of GaN HEMTS
Symmetrical Large-Signal Modeling of Microwave Switch FETs
A packaged 86 W GaN transmitter with SiC varactor-based dynamic load modulation
Investigation of Push-Pull Microwave Power Amplifiers Using an Advanced Measurement Setup
Linearity, Intermodulation Distortion and ACLR in Outphasing Amplifiers
A 44 dBm 1.0-3.0 GHz GaN Power Amplifier with over 45% PAE at 6 dB back-off
A Modified Doherty Power Amplifier With Extended Bandwidth and Reconfigurable Efficiency
A Novel Active Load-pull System with Multi-Band Capabilities
A Wideband and Compact GaN MMIC Doherty Amplifier for Microwave Link Applications
Oscilloscope based two-port measurement system using error-corrected modulated signals
Branch-Line Coupler Design Operating in Four Arbitrary Frequencies
2-D Enhanced Hammerstein Behavior Model for Concurrent Dual-Band Power Amplifier
Design of a Concurrent Dual-Band 1.8-2.4-GHz GaN-HEMT Doherty Power Amplifier
Digital Predistortion for Dual-Input Doherty Amplifiers
Concurrent Dual-Band GaN-HEMT Power Amplifier at 1.8 GHz and 2.4 GHz
Multi-band/Multi-mode and Efficient Transmitter Based on a Doherty Power Amplifier
Linearization Study of a Highly Efficient CMOS-GaN RF Pulse Width Modulation Based Transmitter
2-D enhanced hammerstein behavior model for concurrent dual-band power amplifiers
A novel wideband and reconfigurable high average efficiency power amplifier
Theory and Design of Class-J Power Amplifiers With Dynamic Load Modulation
Decade bandwidth high efficiency GaN HEMT power amplifier designed with resistive harmonic loading
An RF Carrier Bursting System using Partial Quantization Noise Cancellation
Modeling of Long Term Memory Effects in RF Power Amplifiers with Dynamic Parameters
Continuous Class-E Power Amplifier Modes
Digital Predistortion Using a Vector Switched Model
Varactor-Based Dynamic Load Modulation of RF PAs
Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures
High-Efficiency Power Amplifier
Uncertainties in small-signal equivalent circuit modeling
Nonlinear Transistor Model Parameter Extraction Techniques
High-Efficiency RF Pulsewidth Modulation of Class-E Power Amplifiers
A double stub impedance tuner with SiC diode varactors
Highly efficient GaN-HEMT power amplifiers at 3.5 GHz and 5.5 GHz
High efficiency power amplifier design using switch mode optimized transistor models
High efficiency RF pulse width modulation with tunable load network class-E PA
Measurement setup for digital predistortion adaptation
Quantization Noise Minimization in ΣΔ-modulation based RF Transmitter Architectures
Design of Highly Efficient Load Modulation Transmitter for Wideband Cellular Applications
High Efficiency Transmitter Using Varactor Based Dynamic Load Modulation
A highly efficient 1-GHz, 15-W power amplifier design based on a 50-V LDMOS transistor
Successive Cancellation of Power Amplifier Distortion for Multiuser Detection
Band-reconfigurable LDMOS power amplifier
Linearization of Efficiency-Optimized Dynamic Load Modulation Transmitter Architectures
Highly Efficient Dynamic Load Modulation Transmitter
Design of a Highly Efficient 2–4-GHz Octave Bandwidth GaN-HEMT Power Amplifier
Complexity Analysis of Power Amplifier Behavioral Models
Model-Based Adaptation of RF Power Amplifiers
A broadband, efficient, overdriven class-J RF power amplifier for burst mode operation
A Comparative Analysis of the Complexity/Accuracy Tradeoff in Power Amplifier Behavioral Models
A highly efficient 3.5 GHz inverse class-F GaN HEMT power amplifier
Low-complexity volterra modeling of power amplifiers
Time Mismatch Effects in a Dynamic Load Modulation Transmitter Architecture
A general method for passband quantization noise suppression in pulsed transmitter architectures.
Nonideality sources and implementation considerations in polar transmitters
Multi-line TRL calibration compared to a general de-embedding method
Dual-Input Nonlinear Modeling for I/Q Modulator Distortion Compensation
Characterization Setup for Device Level Dynamic Load Modulation Measurements
High-Efficiency LDMOS Power-Amplifier Design at 1 GHz Using an Optimized Transistor Model
Design of High Efficiency Ka-Band Harmonically Tuned Power Amplifiers
Dynamic load modulation of high power amplifiers with varactor-based matching networks
Evaluation of high efficiency PAs for use in supply- and load-modulation transmitters
An Inverse Class-F GaN HEMT Power Amplifier with 78% PAE at 3.5 GHz
I/Q Imbalance Compensation Using a Nonlinear Modeling Approach
Noise-Shaped Coding and Quantization Noise Suppression for Pulsed Transmitter Architectures
Time Alignment in a Dynamic Load Modulation Transmitter Architecture
Compensation of Transmitter Distortion Using a Nonlinear Modeling Approach
Practical realizations of high efficiency switched mode power amplifiers
Comparative analysis of the complexity/accuracy tradeoff for power amplifier behavior models
Identification of Distortions in a RF Measurement System
Nonideality Sources and Implementation Considerations in Polar Transmitters
SiC Varactors for Dynamic Load Modulation of High Power Amplifiers
Modeling of dual-input power amplifiers
Orthonormal-basis power amplifier model reduction
An efficiency optimized controlling scheme for dynamic load modulation of power amplifiers
Voltage/Current mode class D amplifiers and their applications
On-wafer network analyser uncertainty estimation
60 GHz Single-Chip Front-End MMICs and Systems for Multi-Gbps Wireless Communication
Single stage CMOS Power Amplifier at 23 GHz
Large Signal IMD Behaviour: Load Line and Bias
Polar/ET Transmitters: Non-Idealities and Practical Implementation Aspects
System Level Modelling of RF Power Amplifiers Based on Large-Signal Measurements
High Efficiency Modulation of Switched Mode LDMOS Power Amplifiers
Modelling of LDMOSFET and GaN devices
Improvement of Oscilloscope Based RF Measurements by Statistical Averaging Techniques
Modelling of LDMOSFET and GaN devices (invited)
Single-Chip 60 GHz Transmitter and Receiver MMICs in a GaAs mHEMT Technology
Statistical estimation of the propagation constant in multiline calibrations
High Efficiency LDMOS Current Mode Class-D Power amplifier at 1 GHz
Highly Integrated 60 GHz Transmitter and Receiver MMICs in a GaAs pHEMT Technology
Understanding and accurate modelling of nonlinear LDMOS transistor dc characteristics
Systems and Applications for Broadband Wireless Communication in the 60 GHz band
Equivalent circuit modeling of LDMOS transistors
Understanding and prediction of IMD behaviour in power amplifiers
A general procedure for extraction of bias dependent dynamic self heating model parameters
Optimization of power amplifier transfer characteristics
Linearity versus efficiency in mobile handset power amplifiers: A battle without a loser
Statistical Estimation of small signal FET model parameters and their covariance
A comprehensive analysis of IMD behavior in RF CMOS power amplifiers
Intermodulation distortion behavior in LDMOS transistor amplifiers
Optimal parameter extraction and uncertainty estimation in intrinsic FET small-signal models
Prediction of IMD in LDMOS transistor amplifiers using a new large-signal model
Uncertainty estimation and optimal extraction of intrinsic FET small-signal model parameters
High output power, broadband 28-56 GHz MMIC frequency doubler
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Showing 25 research projects
D-MIMO for 6G: An online accessible testbed
Reconfigurable Transmit/Receive Front-End for Multifunctional Sensors
classIC - Chalmers Lund Center for Advanced Semiconductor System Design
Affordable smart GaN IC solutions as enabler of greener applications (ALL2GaN)
A Dual-frequency Distributed MIMO Approach for Future 6G Applications
European Core Technologies for Next Generation Communication-Computing Hardware
Center for III Nitride semiconductor technology (C3NiT) fas2
Helintegrerad suppereffektiv frekvenskam-sändare
Reconfigurable Intelligent Sustainable Environments for 6G Wireless Networks
Improving road safety by high-frequency 5G localization and sensing
Distributed massive MIMO with low-precision components
MyWave - Efficient Millimetre-Wave Communications for mobile users
gan-on-Silicon Efficient mm-wave euRopean systEm iNtegration plAtform (SERENA)
Compact Millimeter Wave Integration Concept for Future Wireless and Sensor Systems
Smarta radiosändare för framtidens millimetervågssystem
Compact Millimeter Wave Integration Concept for Future Wireless and Sensor Systems
Millimeter-wave Backhaul Links at above 100 Gbits/s - Taking smart antennas to the limits
All-Digital Radio-over-Fiber: A New Radio Transmitter Architecture for Future Wireless Applications
Energy efficient millimeter wave transmitters
Modeling and Signal Design for Multiple Antenna Architectures
High efficiency electronic cooking systems (HEECS)