We are looking for a PhD student who wants to work in a research project where you will investigate different approaches to analog linearization and energy efficiency enhancements and design transmitters incorporating such circuits. You will get the opportunity to work with simulation tools to design and analyze microwave circuits that will be implemented either on printed circuit boards or as integrated circuits. You will then measure your circuits using the world class measurement capabilities at MC2, learning state of the art measurement techniques but also develop your own methods.

Information about the research
Telecommunication is one of the key enablers of our modern society. Wireless technology allows us to be connected to an abundance of information anytime, anyplace, to a degree that was unthinkable less than 20 years ago. Telecommunication will also play a key role in transforming our society further and help solve key issues like climate change. It enables smarter devices, connected factories and transport solutions that will be more energy efficient and will facilitate an increased use of renewable energy sources and de-centralized storage, e.g. in electric car batteries. In the last 30 years the focus of wireless research has shifted from making communications possible, to making it more spectrally efficient - i.e. squeezing higher datarates into the same ammount of radio spectrum. While communication systems move to higher and higher frequencies, the availible spectrum is ultimately limited and needs to be shared by many services.

Current 5G and future 6G communication standards utilize very wide bandwidths and challenging waveforms that are optimized for spectral efficiency and have a noise-like amplitude distribution. This means that the average power of these signals is up to 10 times lower than the peak power that occurs rarely but still needs to be transmitted with high fidility. These requirements are in contrast to a power efficient operation of the transmitter circuits, particularly the power amplifier that forms the last step of a transmitter chain. Conventional approaches to boost efficiency while maintaining fidelity use digital computations to predistort the transmit signal to preemptively compensate for the distortions introduced in the transmitter. However, there is a general trend in digital systems that the power consumption for a given circuit scales linearly with the clock rate it is operated at. This means that pushing the bandwidth of this digital predistortion will lead to increased energy use by the digital circuitry.

The position is hosted by the Microwave Electronics Laboratory at MC2 you will have access to commercial state-of-the art MMIC and IC foundry processes and world-class measurement infrastructure allowing for a successful completion of this research project.  At the Microwave Electronics laboratory currently 5 students pursue their Ph.D. in a similar area, which plenty of opportunity to collaborate and learn from and with peers. You will also be an important part of a cross-disciplinary team of PhD students and senior researchers that perform research on future communication systems, ranging from component to system level.

Major responsibilities
Your major responsibilities as PhD student is to pursue your own doctoral studies, including both coursework and research. You are expected to develop your own scientific concepts and communicate the results of your research verbally and in writing. In addition, the position will normally include 20% departmental work, mostly teaching duties. 

The goal of your research is to enable transmitters with higher fidelities and power efficiencies than currently possible, since they are not bound by the limitations of conventional digital approaches. Your research will analyze the scalability of different linearization approaches in terms of frequency, output power, and size constraints and such assess its usability for future high-performance phased array systems. The research results may thus have strong impact in the realization of future wireless systems for communication, sensor, and imaging applications.

To qualify as a PhD student, you must have a master's level degree corresponding to at least 240 higher education credits in a relevant field. A suitable background for this position is a Master of Science in Electrical Engineering, Communication Engineering, or Engineering Physics with specialization in microwave electronics. Further, experience from RF circuit design, high frequency and microwave measurements, and/or advanced signal processing are important merits.

Since communication of research results is a central part of the work, communicative skills in English (oral as well as in writing) are vital. We expect that you can take on responsibility, take own initiatives and work independently when needed. At the same time it is important that you enjoy working in teams. Finally, you need to be able to disseminate results and knowledge within existing and new networks. This includes academia, industry and society at large.

If Swedish is not your native language, Chalmers offers Swedish courses.

Contract terms
Full-time temporary employment. The position is limited to a maximum of 5 years.

We offer
Chalmers offers a cultivating and inspiring working environment in the coastal city of Gothenburg
Read more about working at Chalmers and our benefits for employees.

Chalmers aims to actively improve our gender balance. We work broadly with equality projects, for example the GENIE Initiative on gender equality for excellence. Equality and diversity are substantial foundations in all activities at Chalmers.

Application procedure
The application should be marked with Ref 20220097 and written in English. The application should be sent electronically and be attached as pdf-files, as below:

CV: (Please name the document: CV, Family name, Ref. number)
• CV
• Other, for example previous employments or leadership qualifications and positions of trust.
• Two references that we can contact.

Personal letter: (Please name the document as: Personal letter, Family name, Ref. number)
1-3 pages where you:
• Introduce yourself
• Describe your previous experience of relevance for the position (e.g. education, thesis work and, if applicable, any other research activities)
• Describe your future goals and future research focus

Other documents:
• Copies of bachelor and/or master’s thesis.
• Attested copies and transcripts of completed education, grades and other certificates, e.g. TOEFL test results.

Please use the button at the foot of the page to reach the application form. The files may be compressed (zipped).

Application deadline: 31st of March

For questions, please contact:
Assistant Professor Gregor Lasser, Microwave Electronics Laboratory
Email: gregor.lasser@chalmers.se
Phone: +46-31-772 4635

Professor Christian Fager, Microwave Electronics Laboratory
Email: christian.fager@chalmers.se
Phone: +46-31-772 5047

*** Chalmers declines to consider all offers of further announcement publishing or other types of support for the recruiting process in connection with this position. *** 

Chalmers University of Technology conducts research and education in engineering sciences, architecture, technology-related mathematical sciences, natural and nautical sciences, working in close collaboration with industry and society. The strategy for scientific excellence focuses on our six Areas of Advance; Energy, Health Engineering, Information and Communication Technology, Materials Science, Production and Transport. The aim is to make an active contribution to a sustainable future using the basic sciences as a foundation and innovation and entrepreneurship as the central driving forces. Chalmers has around 11,000 students and 3,000 employees. New knowledge and improved technology have characterised Chalmers since its foundation in 1829, completely in accordance with the will of William Chalmers and his motto: Avancez!