Christian Fager

Biträdande professor at Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Projects

2016–2019

All-Digital Radio-over-Fiber: A New Radio Transmitter Architecture for Future Wireless Applications

Christian Fager Microwave Electronics
Johan Gustavsson Photonics
Ibrahim Can Sezgin Microwave Electronics
Thomas Eriksson Communication Systems
Swedish Research Council (VR)

2016–2018

Millimeter-wave Backhaul Links at above 100 Gbits/s - Taking smart antennas to the limits

Thomas Eriksson Communication Systems
Christian Fager Microwave Electronics
Koen Buisman Microwave Electronics
Dhecha Nopchinda Microwave Electronics
Marianna Ivashina Antennas
Herbert Zirath Microwave Electronics
Amina Piemontese Communication Systems
VINNOVA

2016–2017

Compact Millimeter Wave Integration Concept for Future Wireless and Sensor Systems

Christian Fager Microwave Electronics
Niklas Rorsman Microwave Electronics
Mattias Thorsell Microwave Electronics
Koen Buisman Microwave Electronics
VINNOVA

2013–2017

Energy efficient millimeter wave transmitters

Christian Fager Microwave Electronics
Niklas Rorsman Microwave Electronics
Dan Kuylenstierna Microwave Electronics
William Hallberg Microwave Electronics
Herbert Zirath Microwave Electronics
Mattias Thorsell Microwave Electronics
VINNOVA

2012–2015

Modeling and Signal Design for Multiple Antenna Architectures

Thomas Eriksson Communication Systems
Christian Fager Microwave Electronics
Swedish Research Council (VR)

2011–2014

High efficiency electronic cooking systems (HEECS)

Christian Fager Microwave Electronics
European Commission (FP7)

There might be more projects where Christian Fager participates, but you have to be logged in as a Chalmers employee to see them.

Publications

2017

Digital predistortion parameter identification technique using real-valued measurement output data

MUSTAFA ÖZEN, Jessica Chani Cahuana, Christian Fager et al
IEEE Transactions on Circuits and Systems II: Express Briefs. Vol. 64 (10)
Journal article
2017

Design of linear and efficient power amplifiers by generalization of the Doherty theory

MUSTAFA ÖZEN, Christian Fager, William Hallberg et al
Proceedings of the 2017 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, PAWR 2017, p. 29-32
Conference contribution
2017

Vector-corrected Nonlinear Multi-port IQ-mixer Characterization using Modulated Signals

Mattias Thorsell, Sebastian Gustafsson, Koen Buisman et al
Paper in proceedings
2017

Driver Topologies for RF Doherty Power Amplifiers

Hossein Mashad Nemati, Christian Fager, Paul Saad et al
IEEE Microwave and Wireless Components Letters. Vol. 27 (1), p. 67-69
Journal article
2017

Analysis of nonlinear distortion in phased array transmitters

Koen Buisman, Katharina Hausmair, Christian Fager et al
Paper in proceedings
2017

A Generalized Combiner Synthesis Technique for Class-E Outphasing Transmitters

M. P. Van Der Heijden, R. Jos, Christian Fager et al
IEEE Transactions on Circuits and Systems I: Regular Papers. Vol. 64 (5), p. 1126-1139
Journal article
2016

Current scaled Doherty amplifier for high efficiency and high linearity

MUSTAFA ÖZEN, William Hallberg, Christian Fager
Journal of Logic and Computation, p. Art. no. 7540185-
Paper in proceedings
2016

A Doherty Power Amplifier Design Method for Improved Efficiency and Linearity

Koen Buisman, MUSTAFA ÖZEN, William Hallberg et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 64 (12), p. 4491-4504
Journal article
2016

Iterative Learning Control for RF Power Amplifier Linearization

P. N. Landin, Jessica Chani Cahuana, Christian Fager et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 64 (9), p. 2778-2789
Journal article
2016

Structured Digital Predistorter Model Derivation Based on Iterative Learning Control

Thomas Eriksson, Christian Fager, P. N. Landin et al
2016 46th European Microwave Conference, p. 178-181
Paper in proceedings
2016

Symmetrical Doherty Power Amplifier With Extended Efficiency Range

MUSTAFA ÖZEN, K. Andersson, Christian Fager
IEEE Transactions on Microwave Theory and Techniques. Vol. 64 (4), p. 1273-1284
Journal article
2016

Accurate Circuit Characterization Methods for mm‐Wave 5G Systems

Christian Fager, Jörgen Stenarson, Sebastian Gustafsson et al
Conference contribution
2016

Digital Predistorter Model Derivation Based on Iterative Learning Control

Jessica Chani Cahuana, Thomas Eriksson, Per Landin et al
Paper in proceedings
2016

Doherty's Legacy

Christian Fager, R. Pengelly, MUSTAFA ÖZEN
IEEE Microwave Magazine. Vol. 17 (2), p. 41-58
Journal article
2016

Wideband RF characterization setup with high dynamic range low frequency measurement capabilities

Sebastian Gustafsson, Koen Buisman, Mattias Thorsell et al
Paper in proceedings
2015

A new variant of the indirect learning architecture for the linearization of power amplifiers

Christian Fager, Jessica Chani Cahuana, Thomas Eriksson
2015 European Microwave Conference (EuMIC), p. 444-447
Paper in proceedings
2015

Symmetry based Nonlinear Model for GaN

Klas Yhland, Mattias Thorsell, Christian Fager et al
2015 10th European Microwave Integrated Circuits Conference (Eumic), p. 85-88
Journal article
2015

WebLab: A Web-Based Setup for PA Digital Predistortion and Characterization

Christian Fager, Sebastian Gustafsson, Thomas Eriksson et al
IEEE Microwave Magazine. Vol. 16 (1), p. 138-140
Journal article
2015

A class-J power amplifier with varactor-based dynamic load modulation across a large bandwidth

Christian Fager, William Hallberg, Christer Andersson et al
Journal of Logic and Computation
Paper in proceedings
2015

An Oscilloscope Correction Method for Vector-Corrected RF Measurements

Christian Fager, Sebastian Gustafsson, Mattias Thorsell et al
IEEE Transactions on Instrumentation and Measurement. Vol. 64 (9), p. 2541-2547
Journal article
2015

Symmetry based nonlinear model for GaN HEMTs

Christian Fager, Ankur Prasad, Mattias Thorsell et al
10th European Microwave Integrated Circuits Conference (EuMIC), 2015, p. 85-88
Paper in proceedings
2015

Optimized Design of a Dual-Band Power Amplifier With SiC Varactor-Based Dynamic Load Modulation

Christer Andersson, Cesar Sanchez Perez, MUSTAFA ÖZEN et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 63 (8), p. 2579-2588
Journal article
2015

A new variant of the indirect learning architecture for the linearization of power amplifiers

Jessica Chani Cahuana, Christian Fager, Thomas Eriksson
European Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings, 2015 45th European Microwave Conference Proceedings, EuMC, p. 1295-1298
Paper in proceedings
2015

Analysis of thermal effects in active antenna array transmitters using a combined EM/circuit/thermal simulation technique

Thomas Eriksson, Katharina Hausmair, Christian Fager et al
Paper in proceedings
2015

Outphasing combiner synthesis from transistor load pull data

M Pamoin-Gonzalez, Cesar Sanchez Perez, Christian Fager et al
Journal of Logic and Computation
Paper in proceedings
2014

Efficient and Wideband Power Amplifiers for Wireless Infrastructure Applications

Thomas Eriksson, Christer Andersson, Mustafa Acar et al
Conference contribution
2014

Efficiency optimization for phase controlled multi-source microwave oven

F. Dughiero, P. Korpas, M. Bullo et al
International Journal of Applied Electromagnetics and Mechanics. Vol. 44 (2), p. 235-241
Journal article
2014

A GaN MMIC Modified Doherty PA With Large Bandwidth and Reconfigurable Efficiency

Iltcho Angelov, Jessica Chani Cahuana, David Gustafsson et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 62 (12), p. 3006-3016
Journal article
2014

Symmetrical modeling of GaN HEMTS

Klas Yhland, Christer Andersson, Christian Fager et al
Technical Digest - IEEE Compound Semiconductor Integrated Circuit Symposium, CSIC
Paper in proceedings
2014

On the Impact of Hardware Impairments on Massive MIMO

Lars Svensson, Christian Fager, Katharina Hausmair et al
IEEE Globecom 2014 Workshop - Massive MIMO: From Theory to Practice, 2014-12-08, Austin, Texas, USA, p. 294-300
Paper in proceedings
2014

Prediction of smart antenna transmitter characteristics using a new behavioral modeling approach

Katharina Hausmair, Jessica Chani Cahuana, Christian Fager et al
Journal of Logic and Computation
Paper in proceedings
2014

Linearization of dual-input Doherty power amplifiers

Thomas Eriksson, David Gustafsson, Per Landin et al
International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, INMMiC 2014, p. Art. no. 6815085-
Paper in proceedings
2014

Scalability Analysis and Modeling of Future Massive MIMO Antenna Array Systems

Christian Fager, Thomas Eriksson, Rob Maaskant et al
Conference contribution
2014

Symmetrical Large-Signal Modeling of Microwave Switch FETs

Christian Fager, Klas Yhland, Mattias Thorsell et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 62 (8), p. 1590-1598
Journal article
2014

Digital predistortion of concurrent multiband communication systems

Christian Fager, Thomas Eriksson
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, p. 3918-3922
Paper in proceedings
2014

Wideband and efficient watt-level SiGe BiCMOS switching mode power amplifier using continuous class-E modes theory

MUSTAFA ÖZEN, D.M.W. Leenaerts, M.P. Van Der Heijden et al
Digest of Papers - 2014 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2014; Tampa Bay, FL; United States; 1 June 2014 through 3 June 2014, p. 243-246
Paper in proceedings
2014

Linearization of Difficult Cases - MIMO, GaN and Deep Compression

Per Landin, Thomas Eriksson, Christian Fager et al
Conference contribution
2014

Symmetrical doherty amplifier with high efficiency over large output power dynamic range

MUSTAFA ÖZEN, Christian Fager
Journal of Logic and Computation
Paper in proceedings
2014

Design Method for Quasi-Optimal Multiband Branch-Line Couplers

F. Giannini, P. Colantonio, Kristoffer Andersson et al
International Journal of RF and Microwave Computer-Aided Engineering. Vol. 24 (1), p. 117-129
Journal article
2013

Behavioral modeling of outphasing amplifiers considering memory effects

Christian Fager, Atila Alvandpour, Per Landin et al
Journal of Logic and Computation, p. 1-4
Paper in proceedings
2013

An analysis of the suitability of using CW-theory when designing Doherty PAs for wideband or concurrent multi-band operation

Christer Andersson, David Gustafsson, Christian Fager
43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013, Nuremberg, Germany, 7-10 October 2013, p. 287-290
Paper in proceedings
2013

A Novel Active Load-pull System with Multi-Band Capabilities

Sebastian Gustafsson, Mattias Thorsell, Christian Fager
Paper in proceedings
2013

Linearity, Intermodulation Distortion and ACLR in Outphasing Amplifiers

A. Alvandpour, J Fritzin, Christian Fager et al
Journal of Logic and Computation
Paper in proceedings
2013

A 44 dBm 1.0-3.0 GHz GaN Power Amplifier with over 45% PAE at 6 dB back-off

David Gustafsson, Richard Hellberg, Christian Fager et al
Paper in proceedings
2013

A Wideband and Compact GaN MMIC Doherty Amplifier for Microwave Link Applications

David Gustafsson, Jessica Chani Cahuana, Dan Kuylenstierna et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 61 (2), p. 922-930
Journal article
2013

LDMOS Modeling

Szhau Lai, Christian Fager, Iltcho Angelov et al
IEEE Microwave Magazine. Vol. 14 (1), p. 108-116
Journal article
2013

A Modified Doherty Power Amplifier With Extended Bandwidth and Reconfigurable Efficiency

David Gustafsson, Christer Andersson, Christian Fager
IEEE Transactions on Microwave Theory and Techniques. Vol. 61 (1), p. 533-542
Journal article
2013

A 1-3-GHz Digitally Controlled Dual-RF Input Power-Amplifier Design Based on a Doherty-Outphasing Continuum Analysis

David Gustafsson, Jessica Chani Cahuana, Christian Fager et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 61 (10), p. 3743-3752
Journal article
2013

A packaged 86 W GaN transmitter with SiC varactor-based dynamic load modulation

Eigo Kuwata, Christer Andersson, Yoshihito Hirano et al
43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013, Nuremberg, Germany, 7-10 October 2013, p. 283-286
Paper in proceedings
2013

Investigation of Push-Pull Microwave Power Amplifiers Using an Advanced Measurement Setup

Christian Fager, Kristoffer Andersson, Mattias Thorsell et al
IEEE Microwave and Wireless Components Letters. Vol. 23 (4), p. 220-222
Journal article
2012

Oscilloscope based two-port measurement system using error-corrected modulated signals

Kristoffer Andersson, Christian Fager
Paper in proceedings
2012

Modeling of Long Term Memory Effects in RF Power Amplifiers with Dynamic Parameters

Thomas Eriksson, Ali Soltani Tehrani, Christian Fager
Journal of Logic and Computation, p. Art. no. 6259496-
Paper in proceedings
2012

Digital Predistortion for High Efficiency Power Amplifier Architectures Using a Dual-input Modeling Approach

Haiying Cao, Hossein Mashad Nemati, Ali Soltani Tehrani et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 60 (2), p. 361-369
Journal article
2012

Design and characterization of SiC varactor-based phase shifters

Roberto Quaglia, Christian Fager, Christer Andersson et al
7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012; Amsterdam; Netherlands; 29 October 2012 through 30 October 2012, p. 897-900
Paper in proceedings
2012

Continuous Class-E Power Amplifier Modes

Christian Fager, Hendrikus Jos, MUSTAFA ÖZEN
IEEE Transactions on Circuits and Systems II: Express Briefs. Vol. 59 (11), p. 731-735
Journal article
2012

2-D Enhanced Hammerstein Behavior Model for Concurrent Dual-Band Power Amplifier

Christian Fager, Bumman Kim, Paul Saad et al
Paper in proceedings
2012

2-D enhanced hammerstein behavior model for concurrent dual-band power amplifiers

Christian Fager, Paul Saad, J. Moon et al
European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012, p. 1249-1252
Paper in proceedings
2012

Design of a Concurrent Dual-Band 1.8-2.4-GHz GaN-HEMT Doherty Power Amplifier

P. Colantonio, L. Piazzon, Paul Saad et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 60 (6), p. 1840-1849
Journal article
2012

A novel wideband and reconfigurable high average efficiency power amplifier

Christian Fager, Christer Andersson, David Gustafsson
Journal of Logic and Computation
Paper in proceedings
2012

An RF Carrier Bursting System using Partial Quantization Noise Cancellation

Thomas Eriksson, Paul Saad, Christian Fager et al
IEEE Transactions on Circuits and Systems I: Regular Papers. Vol. 59 (3), p. 515-528
Journal article
2012

Digital Predistortion Using a Vector Switched Model

Christian Fager, Thomas Eriksson, Sepideh Afsar Doost
IEEE Transactions on Microwave Theory and Techniques. Vol. 60 (4), p. 1166-1174
Journal article
2012

Theory and Design of Class-J Power Amplifiers With Dynamic Load Modulation

David Gustafsson, Masatoshi Nakayama, Eigo Kuwata et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 60 (12), p. 3778-3786
Journal article
2012

Linearization Study of a Highly Efficient CMOS-GaN RF Pulse Width Modulation Based Transmitter

Christian Fager, MUSTAFA ÖZEN, Christer Andersson et al
European Microwave Conference, p. 136-139
Paper in proceedings
2012

Concurrent Dual-Band GaN-HEMT Power Amplifier at 1.8 GHz and 2.4 GHz

P. Colantonio, Kristoffer Andersson, Bumman Kim et al
Paper in proceedings
2012

Decade bandwidth high efficiency GaN HEMT power amplifier designed with resistive harmonic loading

B. Kim, J. Moon, Niklas Rorsman et al
Journal of Logic and Computation
Paper in proceedings
2012

Multi-band/Multi-mode and Efficient Transmitter Based on a Doherty Power Amplifier

Paul Saad, L. Piazzon, F. Giannini et al
7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012; Amsterdam; Netherlands; 29 October 2012 through 30 October 2012, p. 1031-1034
Paper in proceedings
2012

Digital Predistortion for Dual-Input Doherty Amplifiers

Jawad Qureshi, Christian Fager, Thomas Eriksson et al
RWW 2012 - Proceedings. 2012 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, PAWR 2012. Santa Clara, CA, 15-18 January 2012, p. 45-48
Paper in proceedings
2012

Branch-Line Coupler Design Operating in Four Arbitrary Frequencies

Christian Fager, Kristoffer Andersson, F. Giannini et al
IEEE Microwave and Wireless Components Letters. Vol. 22 (2), p. 67-69
Journal article
2011

Uncertainties in small-signal equivalent circuit modeling

Christian Fager, Kristoffer Andersson, Mattias Ferndahl
Chapter in monograph, book
2011

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Haiying Cao, Talha Khan, Thomas Eriksson et al
IEEE Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), 2011, p. 1-4
Paper in proceedings
2011

A double stub impedance tuner with SiC diode varactors

Roberto Quaglia, Christer Andersson, Christian Fager et al
Asia Pacific Microwave Conference APMC 2011; Melbourne, VIC; 5 - 8 December 2011, p. 267-270
Paper in proceedings
2011

Measurement setup for digital predistortion adaptation

Ali Soltani Tehrani, Thomas Eriksson, Christian Fager
Conference contribution
2011

High efficiency power amplifier design using switch mode optimized transistor models

Paul Saad, Hossein Mashad Nemati, Christian Fager et al
Conference contribution
2011

Highly efficient GaN-HEMT power amplifiers at 3.5 GHz and 5.5 GHz

Paul Saad, Kristoffer Andersson, Hossein Mashad Nemati et al
Paper in proceedings
2011

Nonlinear Transistor Model Parameter Extraction Techniques

Christian Fager, David Root, Mathias Rudolph
Edited book
2011

High-Efficiency RF Pulsewidth Modulation of Class-E Power Amplifiers

Christer Andersson, MUSTAFA ÖZEN, Hendrikus Jos et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 59 (11), p. 2931-2942
Scientific journal article - non peer reviewed
2011

Varactor-Based Dynamic Load Modulation of RF PAs

Ali Soltani Tehrani, Christer Andersson, Hendrikus Jos et al
Conference contribution
2011

High-Efficiency Power Amplifier

Hossein Mashad Nemati, Paul Saad, Christian Fager et al
IEEE Microwave Magazine. Vol. 12 (1), p. 81-84
Journal article
2011

High efficiency RF pulse width modulation with tunable load network class-E PA

R. Jos, MUSTAFA ÖZEN, M. P. Van Der Heijden et al
Paper in proceedings
2010

High Efficiency Transmitter Using Varactor Based Dynamic Load Modulation

Haiying Cao, Ali Soltani Tehrani, Herbert Zirath et al
IEEE International Microwave Workshop Series on “RF Front-ends for Software Defined and Cognitive Radio Solutions”, p. 37-40
Paper in proceedings
2010

Linearization of Efficiency-Optimized Dynamic Load Modulation Transmitter Architectures

Thomas Eriksson, Hossein Mashad Nemati, Haiying Cao et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 58 (4), p. 873-881
Journal article
2010

Band-reconfigurable LDMOS power amplifier

Hossein Mashad Nemati, Christian Fager, Jan Grahn
2010 European Microwave Conference, p. 978-981
Paper in proceedings
2010

Low-complexity volterra modeling of power amplifiers

Ali Soltani Tehrani, Thomas Eriksson, Christian Fager et al
2010 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, INMMiC 2010; Goteborg; 26 April 2010 through 27 April 2010, p. 136-139
Paper in proceedings
2010

A broadband, efficient, overdriven class-J RF power amplifier for burst mode operation

P. Singerl, D.R. Parveg, A. Wiesbauer et al
European Microwave Week 2010: Connecting the World, EuMIC 2010 - Conference Proceedings, p. 424-427
Conference contribution
2010

A highly efficient 3.5 GHz inverse class-F GaN HEMT power amplifier

Hossein Mashad Nemati, Herbert Zirath, Haiying Cao et al
International Journal of Microwave and Wireless Technologies. Vol. 2 (3-4), p. 317-324
Journal article
2010

A highly efficient 1-GHz, 15-W power amplifier design based on a 50-V LDMOS transistor

Peter Singerl, C Schuberth, F. Dielacher et al
Journal of Logic and Computation, p. 1102-1105
Paper in proceedings
2010

Evaluation of a GaN HEMT transistor for load- and supply-modulation applications using intrinsic waveform measurements

Jan Grahn, Herbert Zirath, Steve C. Cripps et al
Journal of Logic and Computation, p. 509-512
Paper in proceedings
2010

Design of Highly Efficient Load Modulation Transmitter for Wideband Cellular Applications

Christian Fager, B. Almgren, Hossein Mashad Nemati et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 58 (11), p. 2820-2828
Journal article
2010

Design of a Highly Efficient 2–4-GHz Octave Bandwidth GaN-HEMT Power Amplifier

Kristoffer Andersson, Paul Saad, Christian Fager et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 58 (7), p. 1677-1685
Journal article
2010

Linearization of Efficiency-Optimized Dynamic Load Modulation Transmitter Architectures

Haiying Cao, Hossein Mashad Nemati, Ali Soltani Tehrani et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 58 (4), p. 873-881
Journal article
2010

Successive Cancellation of Power Amplifier Distortion for Multiuser Detection

Thomas Eriksson, Ali Behravan, Haiying Cao et al
2010 IEEE 72nd Vehicular Technology Conference Fall, VTC2010-Fall; Ottawa, ON; Canada; 6 September 2010 through 9 September 2010
Paper in proceedings
2010

A broadband, efficient, overdriven class-J RF power amplifier for burst mode operation

D.R. Parveg, A. Wiesbauer, Christian Fager et al
European Microwave Week 2010: Connecting the World, EuMIC 2010 - Conference Proceedings, p. 424-427
Conference contribution
2010

Model-Based Adaptation of RF Power Amplifiers

Ali Soltani Tehrani, Christian Fager, Thomas Eriksson
Conference contribution
2010

Quantization Noise Minimization in ΣΔ-modulation based RF Transmitter Architectures

Christian Fager, Ulf Gustavsson, Thomas Eriksson
IEEE Transactions on Circuits and Systems I: Regular Papers. Vol. 57 (12), p. 3082-3091
Journal article
2010

Evaluation of a GaN HEMT transistor for load- and supply-modulation applications using intrinsic waveform measurements

Johannes Benedikt., Herbert Zirath, Paul J. Tasker et al
Journal of Logic and Computation, p. 509-512
Paper in proceedings
2010

Complexity Analysis of Power Amplifier Behavioral Models

Thomas Eriksson, Ali Soltani Tehrani, Haiying Cao et al
International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits, p. 102-105
Paper in proceedings
2010

Highly Efficient Dynamic Load Modulation Transmitter

Haiying Cao, Thomas Eriksson, Ali Soltani Tehrani et al
Conference contribution
2010

A Comparative Analysis of the Complexity/Accuracy Tradeoff in Power Amplifier Behavioral Models

Thomas Eriksson, Christian Fager, Ali Soltani Tehrani et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 58 (6), p. 1510-1520
Journal article
2009

Characterization Setup for Device Level Dynamic Load Modulation Measurements

Kristoffer Andersson, Christian Fager, Mattias Thorsell
Paper in proceedings
2009

I/Q Imbalance Compensation Using a Nonlinear Modeling Approach

Ali Soltani Tehrani, Herbert Zirath, Christian Fager et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 57 (3), p. 513-518
Journal article
2009

An Inverse Class-F GaN HEMT Power Amplifier with 78% PAE at 3.5 GHz

Kristoffer Andersson, Hossein Mashad Nemati, Paul Saad et al
Microwave Conference, 2009. EuMC 2009. European, Sept. 29 2009-Oct. 1 2009, Rome, p. 496-499
Paper in proceedings
2009

Design of Varactor-Based Tunable Matching Networks for Dynamic Load Modulation of High Power Amplifiers

Christian Fager, Ulf Gustavsson, Hossein Mashad Nemati et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 57 (5), p. 1110-1118
Journal article
2009

High-Efficiency LDMOS Power-Amplifier Design at 1 GHz Using an Optimized Transistor Model

Herbert Zirath, Hossein Mashad Nemati, Christian Fager et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 57 (7), p. 1647-1654
Journal article
2009

A general method for passband quantization noise suppression in pulsed transmitter architectures.

Thomas Eriksson, Ulf Gustavsson, Christian Fager
Journal of Logic and Computation, p. 1529 - 1532
Journal article
2009

Evaluation of high efficiency PAs for use in supply- and load-modulation transmitters

Hendrikus Jos, Christian Fager, Herbert Zirath et al
Paper in proceedings
2009

Dynamic Load Modulation of High Power Amplifiers with Varactor-Based Matching Netwokrs

Thomas Eriksson, Haiying Cao, Hossein Mashad Nemati et al
Paper in proceedings
2009

Noise-Shaped Coding and Quantization Noise Suppression for Pulsed Transmitter Architectures

Ulf Gustavsson, Thomas Eriksson, Christian Fager
Conference contribution
2009

Time Mismatch Effects in a Dynamic Load Modulation Transmitter Architecture

Hossein Mashad Nemati, Thomas Eriksson, Ali Soltani Tehrani et al
Conference contribution
2009

Multi-line TRL calibration compared to a general de-embedding method

Kristoffer Andersson, Christian Fager, Mattias Ferndahl
ARFTG 73rd Microwave Measurement Conference. Vol. 1
Paper in proceedings
2009

Dual-Input Nonlinear Modeling for I/Q Modulator Distortion Compensation

Herbert Zirath, Thomas Eriksson, Haiying Cao et al
Paper in proceedings
2009

Nonideality sources and implementation considerations in polar transmitters

Anding Zhu, Christian Fager, Jose C. Pedro et al
International Journal of Microwave and Wireless Technologies. Vol. 1 (2), p. 109-116
Journal article
2009

Time Alignment in a Dynamic Load Modulation Transmitter Architecture

Christian Fager, Herbert Zirath, Thomas Eriksson et al
Proceedings of the 39th European Microwave Conference, EuMC 2009, Sept. 29-Oct. 1 2009, Rome, p. 1211 - 1214
Paper in proceedings
2009

Design of High Efficiency Ka-Band Harmonically Tuned Power Amplifiers

Christian Fager, Herbert Zirath, Hossein Mashad Nemati et al
Paper in proceedings
2008

SiC Varactors for Dynamic Load Modulation of High Power Amplifiers

Anne Henry, Ulf Gustavsson, Niklas Rorsman et al
IEEE Electron Device Letters. Vol. 29 (7), p. 728-730
Journal article
2008

Power Amplifier Behavioral Modeling Performance Comparison of the LSNA and the modulation-domain system

Christian Fager, Kristoffer Andersson, Magnus Isaksson et al
Paper in proceedings
2008

Identification of Distortions in a RF Measurement System

Haiying Cao, Ali Soltani Tehrani, Thomas Eriksson et al
Conference contribution
2008

Practical realizations of high efficiency switched mode power amplifiers

Andreas Ådahl, Christian Fager, Hossein Mashad Nemati et al
Conference contribution
2008

Modeling of dual-input power amplifiers

Herbert Zirath, Christian Fager, Ali Soltani Tehrani et al
Conference contribution
2008

Compensation of Transmitter Distortion Using a Nonlinear Modeling Approach

Thomas Eriksson, Haiying Cao, Christian Fager et al
International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits 2008, p. 131-134
Paper in proceedings
2008

Nonideality Sources and Implementation Considerations in Polar Transmitters

Christian Fager, Hossein Mashad Nemati, J.C. Pedro et al
Paper in proceedings
2008

A General Statistical Equivalent-Circuit-Based De-Embedding Procedure for High-Frequency Measurements

Peter Linner, Kristoffer Andersson, Christian Fager et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 56 (12), p. 2692-2700
Journal article
2008

Characterization of Switch Mode LDMOS and GaN Power Amplifiers for Optimal Use in Polar Transmitter Architectures

Christian Fager, Hossein Mashad Nemati, Ulf Gustavsson et al
Proc. IEEE International Microwave Symposium, p. 1505 - 1508
Paper in proceedings
2008

An efficiency optimized controlling scheme for dynamic load modulation of power amplifiers

Herbert Zirath, Hossein Mashad Nemati, Ulf Gustavsson et al
European Microwave Conf., Proc., Oct. 2008, p. 583-586
Paper in proceedings
2008

Voltage/Current mode class D amplifiers and their applications

Ulf Gustavsson, Christian Fager, B. Almgren et al
Conference contribution
2008

Orthonormal-basis power amplifier model reduction

Haiying Cao, Ali Soltani Tehrani, Christian Fager et al
Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, 2008. INMMIC 2008., p. 39 - 42
Paper in proceedings
2008

On-wafer network analyser uncertainty estimation

Jörgen Stenarson, Klas Yhland, Kristoffer Andersson et al
Conference contribution
2008

An efficiency optimized controlling scheme for dynamic load modulation of power amplifiers

Hossein Mashad Nemati, Herbert Zirath, Christian Fager et al
European Microwave Conf., Proc., Oct. 2008, p. 583-586
Paper in proceedings
2008

An efficiency optimized controlling scheme for dynamic load modulation of power amplifiers

Hossein Mashad Nemati, Herbert Zirath, Ulf Gustavsson et al
European Microwave Conf., Proc., Oct. 2008, p. 583-586
Paper in proceedings
2008

Comparative analysis of the complexity/accuracy tradeoff for power amplifier behavior models

Ali Soltani Tehrani, Christian Fager, Herbert Zirath et al
Conference contribution
2007

Design of highly efficient, high output power, L-band class D-1 RF power amplifiers using GaN MESFET devices

T. Lejon, Ulf Gustavsson, Christian Fager et al
Proc. European Conference on Wireless Technologies, p. 371-374
Paper in proceedings
2007

Single stage CMOS Power Amplifier at 23 GHz

Herbert Zirath, Hossein Mashad Nemati, Mattias Ferndahl et al
Conference contribution
2007

System Level Modelling of RF Power Amplifiers Based on Large-Signal Measurements

A. Zhu, Hossein Mashad Nemati, D Schreuers et al
Proc. European Microwave Integrated Circuits Conference, p. 131-134
Paper in proceedings
2007

Polar/ET Transmitters: Non-Idealities and Practical Implementation Aspects

J.C. Pedro, J.A. Garcia, Christian Fager et al
Conference contribution
2007

Large Signal IMD Behaviour: Load Line and Bias

Christian Fager
Conference contribution
2007

High Efficiency Modulation of Switched Mode LDMOS Power Amplifiers

Christian Fager, Ulf Gustavsson, Hossein Mashad Nemati et al
Paper in proceedings
2007

60 GHz Single-Chip Front-End MMICs and Systems for Multi-Gbps Wireless Communication

Herbert Zirath, Rumen Kozhuharov, Sten Gunnarsson et al
IEEE Journal of Solid-State Circuits. Vol. 42 (5), p. 1143 - 1157
Journal article
2006

Improvement of Oscilloscope Based RF Measurements by Statistical Averaging Techniques

Kristoffer Andersson, Christian Fager
Journal of Logic and Computation, p. 1460-1463
Paper in proceedings
2006

Modelling of LDMOSFET and GaN devices (invited)

N.B. Carvalho, Christian Fager
Conference contribution
2006

High Efficiency LDMOS Current Mode Class-D Power amplifier at 1 GHz

Hossein Mashad Nemati, Herbert Zirath, Christian Fager
36th European Microwave Conference. Vol. 1 (1), p. 176-9
Paper in proceedings
2006

Statistical estimation of the propagation constant in multiline calibrations

Christian Fager, Kristoffer Andersson
Paper in proceedings
2006

Single-Chip 60 GHz Transmitter and Receiver MMICs in a GaAs mHEMT Technology

Camilla Kärnfelt, Christian Fager, Arne Alping et al
Proceedings of IEEE MTT-S International Microwave Symposium, 11-16 June, 2006, p. 801-804
Paper in proceedings
2006

Modelling of LDMOSFET and GaN devices

N.B. Carvalho, Christian Fager
Conference contribution
2005

Understanding and prediction of IMD behaviour in power amplifiers

Christian Fager
Chapter in monograph, book
2005

Systems and Applications for Broadband Wireless Communication in the 60 GHz band

Sten Gunnarsson, U. Engström, Christian Fager et al
GigaHertz 2005. Vol. 1 (1), p. 175-80
Paper in proceedings
2005

Understanding and accurate modelling of nonlinear LDMOS transistor dc characteristics

Herbert Zirath, Christian Fager, K.-H. Eklund
GigaHertz 2005. Vol. 1 (1), p. 181-4
Paper in proceedings
2005

Equivalent circuit modeling of LDMOS transistors

Christian Fager
Conference contribution
2005

A general procedure for extraction of bias dependent dynamic self heating model parameters

Christian Fager, J.C. Pedro, Kristoffer Andersson
Microwave Symposium Digest, 2005 IEEE MTT-S International, p. 1159-1162
Paper in proceedings
2005

Single-Chip 60 GHz Transmitter and Receiver MMICs for Very High Speed (several Gigabit/s) Wireless Transmission

Sten Gunnarsson, Rumen Kozhuharov, Christian Fager et al
Conference contribution
2005

Highly Integrated 60 GHz Transmitter and Receiver MMICs in a GaAs pHEMT Technology

Sten Gunnarsson, Arne Alping, Christian Fager et al
Journal article
2005

A general procedure for extraction of bias dependent dynamic self heating model parameters

Christian Fager, Kristoffer Andersson, J.C. Pedro
Microwave Symposium Digest, 2005 IEEE MTT-S International, p. 1159-1162
Paper in proceedings
2004

Statistical Estimation of small signal FET model parameters and their covariance

Kristoffer Andersson, Herbert Zirath, Christian Fager et al
Paper in proceedings
2004

Linearity versus efficiency in mobile handset power amplifiers: A battle without a loser

Christian Fager, J.A. Garcia, N.B. Carvalho et al
Microwave Engineering Europe (Aug/Sept), p. 19-26
Journal article - popular science
2004

A comprehensive analysis of IMD behavior in RF CMOS power amplifiers

Herbert Zirath, M.J. Rosário, Christian Fager et al
IEEE Journal of Solid-State Circuits. Vol. 39 (1), p. 24-34
Journal article
2004

Linearity versus efficiency in mobile handset power amplifiers: A battle without a loser

Christian Fager, J.C. Pedro, J.A. Garcia et al
Microwave Engineering Europe (Aug/Sept), p. 19-26
Journal article - popular science
2004

Optimization of power amplifier transfer characteristics

Christian Fager, Herbert Zirath
European Microwave Conference, p. 1325-28
Paper in proceedings
2003

Microwave FET Modeling and Applications

Christian Fager
Doctoral thesis
2002

Optimal parameter extraction and uncertainty estimation in intrinsic FET small-signal models

Christian Fager, J.C. Pedro, Peter Linner
IEEE Transactions on Microwave Theory and Techniques. Vol. 50 (Dec.), p. 2797-803
Journal article
2002

Intermodulation distortion behavior in LDMOS transistor amplifiers

Christian Fager, Herbert Zirath, J.C. Pedro et al
IEEE MTT-S International Microwave Symposium. Vol. 1, p. 131-4
Paper in proceedings
2002

Prediction of IMD in LDMOS transistor amplifiers using a new large-signal model

J.C. Pedro, Herbert Zirath, N.B. Carvalho et al
IEEE Transactions on Microwave Theory and Techniques. Vol. 50 (Dec.), p. 2834-42
Journal article
2002

Uncertainty estimation and optimal extraction of intrinsic FET small-signal model parameters

J.C. Pedro, Peter Linner, Christian Fager
IEEE MTT-S International Microwave Symposium. Vol. 2, p. 729-32
Paper in proceedings
2001

MMIC FET frequency doublers and FMCW radar transceivers

Christian Fager
Licentiate thesis
2001

MMIC FET frequency doublers and FMCW radar transceivers

Christian Fager
Licentiate thesis
2000

High output power, broadband 28-56 GHz MMIC frequency doubler

Christian Fager, Lars Landén, Herbert Zirath
IEEE MTT-S International Microwave Symposium / Perkins, T., p. 1589-91 vol.3
Paper in proceedings
1999

Characterisation of an FMCW radar transceiver

Christian Fager
Report