Department of Electrical Engineering (ISY)

Ted Johansson

Ted Johansson received the M.Sc. degree in Applied Physics and Electrical Engineering in 1985, and the Dr. Tech. and Ph.D. degrees in Electronic Devices from Linköping University, Sweden, in 1993 and 1998, respectively.
From 1985 to 1989, he was with the Swedish Institute of Microwave Technology, Stockholm, conducting research in the area of MOS process technology. He joined Ericsson Components AB in 1989 and was heavily involved in the development of RF power transistors for cellular base stations for almost ten years. His interest then shifted into RF IC technologies, mainly SiGe bipolar and BiCMOS, and integrated power amplifiers for wireless handsets. After the acquisition of Ericsson Microelectronics AB by Infineon Technologies in 2002, he divided his attention between research on SOI for BiCMOS, technology strategy for future RFIC processes (BiCMOS and CMOS), and competitor technology analysis. In 2005, the focus was switched again to power amplifiers for wireless applications, mainly for cordless phones. Between 2008 and 2011, he was with Huawei Technologies Sweden AB, working on R&D for cellular basestations with focus on design of integrated PAs, LNAs, future radio architectures and components technologies.
Since 2009, he is Adjunct Professor in the Integrated Circuits and Systems group. His research interest is mainly CMOS power amplifiers.
He has published 80 journal and conference peer-reviewed papers, one book chapter about SiGe devices, and holds 40 patents.
Ted is an IEEE Senior Member, former chair and currently vice chair of IEEE Sweden Solid-State Circuits/Circuits & System Joint Chapter, and also former vice chair of IEEE Sweden Electron Device Society.

CV, updated 2018-11
Publications and patents, updated 2018-11

Research interests:

During the years, my interests have shifted "upwards" in integration level, from Devices (including fabrication methods and process integration) via the main area Power Amplifiers (discrete and integrated, device knowledge is essential, some circuit design, quite experimental), to other building blocks for radio design such as LNAs, to Radio Architectures for flexible TRX designs. Today, CMOS Integrated Power Amplifiers is the main focus of my research work.

The research is radio communication related (cellular 2G, 3G, 4G, but also Bluetooth, WLAN, DECT), since I have been working for Ericsson, Infineon, and Huawei.

Google Scholar page

Current research:

33 miljoner till innovativ elektronik (Elektroniktidningen, 2016-06-16)

Some recent presentations:

ISCAS 2018: A Modified All-Digital Polar PWM Transmitter

GHz symposium 2018: Digital predistortion with bandwidth limitations for a 28 nm WLAN 802.11ac transmitter

GHz symposium 2018: An All-Digital Polar PWM Transmitter

IECC 2017 (Keynote talk): The 28 nm CMOS Power Amplifier

Docentföreläsning 2015-12-14 (in Swedish): Moores lag - vid vägs ände efter 50 år?

Some recent publications:

Oscar Morales Chacon, Ted Johansson, Thomas Flink, "The effect of DPD bandwidth limitation on EVM for a 28 nm WLAN 802.11ac transmitter", NORCAS 2017, Linköping, Sweden, Oct 24-25, 2017.

Muhammad T. Pasha, Muhammad F. Ul Haque, Jahanzeb Ahmad, Ted Johansson, "A Modified All-Digital Polar PWM Transmitter", IEEE Transactions on Circuits and Systems I: Regular Papers, pp. 758-768, Feb 2018.

Muhammad Touqir Pasha, Muhammad Fahim Ul Haque, Jahanzeb Ahmad, Ted Johansson, "An All-digital PWM Transmitter with Enhanced Phase Resolution", IEEE Transactions on Circuits and Systems II: Express Briefs, pp. 1634-1638, Nov 2018.

Writing in popular press:

"Lär dem löda!", SER-krönika i Elektroniktidningen 2015

"Porter och chips, Swedish SSC/CAS Chapter Conference in Historic Beer Brewery", IEEE Solid-State Magazine, Fall 2015.

Courses:

Undergraduate course, advanced level: TSEK02 "Radio Electronics"

Undergraduate course, advanced level: TSEK03 "Radio Frequency Integrated Circuits"

Undergraduate course, advanced level: TSEK38 "Radio Frequency Transceiver Design"

"A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering." —Freeman Dyson (1923– )"

And finally, a classic from 1957, "A glossary for research reports"