Elektro- och informationsteknik

Lunds Tekniska Högskola | Lunds universitet


Babak will continue to lower the power

Publicerad: 2017-06-21

Babak Mohammadi responding


Text: Anders Borgström, Photo: Yunus Ökmen

Attacking power dissipation

-I’ve been mostly focused on the transistor- and gate level but also touched on the module- and architecture level during my research, says Babak. More functionality, higher performance and millions of transistors also means higher power dissipation in modern integrated circuits.  

EITs fresh doctor, Babak Mohammadi, kept a strict focus during his PhD-studies on attacking this problem from transistor to architectural levels. His work helps to counteract the accelerating global power demand we see as a result of the increased IoT and digitalization rollouts all over the world.

Larger circuits and lower supply voltages

When the circuit technology reached 800nm a new trend in integrated circuit design started, namely careful design around power saving and development of methods around that. As circuits and systems grew larger in terms of number of transistors, excessive leakage power  became obvious and energy reduction techniques started to emerge. It was time to leave the concept of unified power supply voltage for all modules on a chip.

-In general, the supply voltages have gone down since then from 5V to the current state of 800mV, says Babak. -And the latest transistor technology of today has come down to 5nm!

Babak Mohammadi and chairman Mats Gustafsson

Dynamic and static dissipation

We ask Babak what’s most important to consider for ICs, static or dynamic power dissipation?

-Both are important, Babak responds directly. –It’s depending on applications where e.g. in a memory circuit which is not changing logic levels so much static power has higher share. -A high performing processor core, on the other hand, dynamic power could be more critical, he says.

Talking in 1997 and  surfing in 2017

Back in the 90-ies, a cellphone lasted for weeks on one full battery. Ericsson SH388 had 4,5 hours talktime and 2 weeks standby. An Iphone of today has to be topped up every day with normal talk and surf. Why?

–At that time the main application was “voice”, Babak explains. -The circuits to solve that were very small compared to what a mobile phone host today. The transistors at that time were fewer, physically larger and performed much better in standby mode compared to the tiny ones of today. And batteries were larger compared to the ones in our mobiles today. Also usage profile with the large screens used all the time is demanding a lot of power.

Opponent and member of committee


Looked for cities

How come you enter the track of electronics?

-I was always fascinated by electronics and broke chips as a kid where I looked for cities inside the chip, Babak says with a smile. -Someone told me that they were there. I wanted to design my own chips and so it turned out. I still keep my first chip, a 64x64 image sensor. My wallet carries the package and my backpack the actual chip. Important stuff for me, he says with a smile.

From Urmia

Babak grew up in Urmia, a 1-million city in the north-western part of Iran, on the road from Teheran to Turkey. –My brother and my parents still live there but my brother will come for masters studies to Italy during fall. Also an electronic guy.


Powerful future

-Continue to lower the power! That’s Babaks response when asking him about what the future holds for him. Research, employment, startup or something else is still an open question but I’m interested in this area and there is plenty to do so I will find my place, says Babak.

Nice job, nice leisure time.

I like and practice football, music and travelling and when it comes to electronics, breaking and fixing stuff is fun. A sweet memory from the PhD-studies was winning the best pitch award at the Entrepreneurship course back in 2015. See earlier article on this. .  

Perhaps some good entrepreneurship ideas are growing again…???

Congratulations to Babak from EIT!


Early summer IEEE CAMAD event hosted by EIT

Publicerad: 2017-06-15

Text Anders Borgström 

-We are pleased being able to gather such a wide range of leading researchers in wireless networks and 5G technology for the CAMAD-workshop here in Lund, says EITs professor Björn Landfeldt. -This year's focus is very well in line with this regions traditional specialist skills. 

General CAMAD chairmembers well known to EIT are except Björn Landfeldt, LTH also Björn Ekelund, Ericsson and Peter C. Karlsson, Sony. A tutorial will also be given by EIT-professor Fredrik Tufvesson on "Massive MIMO from theory to practice, lessons learned so far".

CAMAD is an acronym for "Computer-Aided Modeling Analysis and Design of Communication Links and Networks". Every year there is a new workshop and this year the baton is grabbed by LTH and EIT who will host the event. It will take place June 19-21, 2017 in E-huset, more particularly in E:A and sessions’ room E:3139. 

Agenda items cover recent developments on tools and techniques for the performance evaluation of communications systems and this year the focus is on 5G networking and beyond. CAMAD is an IEEE Communications Society portfolio event and this 22nd one. 

Scientists, engineers, manufacturers and service providers will meet and exchange experiences, new ideas and research results. Also keynotes speeches, panel sessions, tutorials and a demo session will take place.

Keynote talk titles are “Sharing and slicing next generation networks”, “Networking in the millimeter waves band” and “Smart networks” and other topics during the event cover areas like Millimiter Waves Wireless Networks, Infrastructure as a Service, Source Cloud Platforms, Virtual Network Functions Placement and much more. 

More info on the event with detailed program can be found here.



Battle of Bara bräcker Barsebäck

Publicerad: 2017-06-07

Text: Anders Borgström/Anders Karlsson, Bild: Richard Lundin

Institutionsmästerskapet i golf har gått av stapeln för tionde året i rad och Torleif Martin gick segrande ur striden för 2017.  Tidigare års vinnare är: 

2008 Bengt Mandersson(Spelades på Lunds Akademiska GK)
2009 Ulf Körner(Spelades på Kävlinge GK)
2010 Bengt Mandersson(Spelades på Romeleåsens GK)
2011 Ulf Körner(Spelades på Sjöbo GK)
2012 Richard Lundin(Spelades på Landskrona GK)
2013 Anders Karlsson(Spelades på Lunds Akademiska GK)
2014 Bengt Mandersson(Spelades på Sjöbo GK)
2015 Anders Karlsson(Spelades på Örestad GK)
2016 Anders Karlsson(Spelades på Landskrona GK)

Kampen (se fler bilder nedan) utspelades i Bara och silvermedaljören Anders Karlsson rapporterar följande:

Kära golfälskare,

Årets institutionsmästerskap i golf spelades på den krävande Linksbanan vid den exklusiva golfanläggningen PGA National of Sweden i Bara. Innan tävlingen åt deltagare och publik en god lunch i klubbhuset.

I år hade vi  en utLundsk spelare i startfältet! Det var vår adjungerade professor Torleif Martin, som inte bara deltog utan också segrade efter lysande spel. Torleif är från Linköping och spelar en typ av nujäklaranamannagolf, som visade sig mer effektiv än den elegiska form av golf vi från Lundatrakten utövar.  Stort grattis Torleif!

Vädret var perfekt och startfältet starkt, så vi hade räknat med en stor publik. Tyvärr valde många bort vår fina tävling till förmån för den mer pengastinna Nordea Master i Barsebäck. Det gjorde att det förväntade publikhavet reducerades till en person, nämligen Richard Lundin. Richard var dock inte bara publik! Ånej, han var också domare, caddy, protokollförare, prisutdelare, diplomtillverkare, bolletare och fotograf. Stort tack Richard för denna simultanekvilibristiska insats.


Här är så de fyra stolta medaljörerna:

Guld: Torleif Martin (stabilt spel hela dagen)

Stora silver: Anders Karlsson (spelade som en gud första nio och som en kratta andra nio)

Lilla silver: Bengt Mandersson (satte en 30 meters chip rätt i koppen och sänkte dessutom en 9-metersputt!)

Brons: Ulf Körner (sänkte en 10-metersputt!)

Nästa år arrangeras tävlingen av Torleif. Tävlingen är som vanligt öppen för alla som är knutna till institutionen.



EIT researchers awarded "best paper" at Test Symposium in Amsterdam

Publicerad: 2017-06-07

At the 21:st IEEE European Test Symposium (ETS) held in Amsterdam, The Netherlands, in May 2016, the paper: A Self-Reconfiguring IEEE 1687 Network for Fault Monitoring by Farrokh Ghani Zadegan, Dimitar Nikolov and Erik Larsson was awarded as the best paper. 

The  ETS is Europe’s premier forum dedicated to presenting and discussing scientific results, emerging ideas, applications, hot topics, and new trends in the area of electronic-based circuits and system testing and reliability. The acceptance rate of technical paper at ETS’16 was 21%.The best paper award was given at the 22nd ETS, held in Limassol, Cyprus. 

Congratulations from EIT!

Read more at:



COST-meetings hosted by EIT in E-Huset

Publicerad: 2017-06-01

Text and Photo: Anders Borgström

LTH and EIT organized the IRACON “Inclusive Radio Communication Networks for 5G and beyond” meetings and workshops by the COST Action CA15104 during May 29-31, 2017.  Around 100 attendees gathered at E-Huset, LTH for follow up on actions, deliverables, finances, dissemination as well as listening to keynotes and presentations and not the least to discuss,  socialize, eat and drink with colleagues and friends.

The meetings involved academia and industry from all over Europe, with the support of some non-COST institutions and R&D associations and standardisation bodies worldwide.

Main organizers were Fredrik Tufvesson and Buon Kiong Lau (Vince).

KEYNOTE SPEAKERS were Dr. Leif Wilhelmsson, Ericsson Research, Lund, Sweden talking about “Key IEEE 802.11 components: High Efficiency Wi-Fi and Wake-Up Radios” and Dr. Peter Karlsson, Sony Mobile, Lund, Sweden talking about “Next levels of low power and long range cellular IoT”.

The meeting dealt with radio communications and connected devices like mobile phones, machines, sensors, vehicles and more. Wireless connection to the internet increases dramatically in numbers and the IRACON-concept defines technologies aimed to support wireless connectivity at any rates, for any communicating units, and in any type of scenarios. Radio access, wireless networks and systems are all subject to incredible research and development and this meeting is in the center of it all.

Fundamental theories, applied research and novel design for 5G (and beyond) radio networks were in focus and there is no lack of challenges. The wireless world include modelling of radio channels, capacity, energy, mobility, latency, scalability, network automation, moving nodes, cloud and virtualisation architectures. Also experimental research addressing Over-the-Air testing, Internet of Things, localization, tracking and new radio access technologies are included.

Demo on EIT 5G-mobile (not portable) device by Steffen Malkowsky and M-MIMO team

Since the COST-event was a working meeting (workshop) also deliverables and actions were followed up and also a tutorial+demo on the EIT Massive MIMO testbed took place. Tutorial speakers were Fredrik Tufvesson and Ove Edfors, Lund University, Sweden talking about “Tutorial, Massive MIMO: from theory to practice”. 




Mjukvaruutveckling på Peggys tårtseminarium

Publicerad: 2017-05-12

Text: Anders Borgström. Bild: Anders Borgström and Per Runesson

Torsdagens tårtsemnarium handlade om mjukvarutvecklarnas betydelse för framtidens kunskapsfabrik eller akademin, om man så vill. Föreläsare var Professor Margaret-Anne Storey eller Peggy som många kallar henne och hon är Lise Meitner gästprofessor på EITs systerinstitution Datavetenskap. Peggy kommer från University of Victoria i Kanada och under seminariet förmedlades intressant information om deras forskning kring utvecklares samarbeten i stora komplexa mjukvaruprojekt.

Mjukvarans betydelse ökar hela tiden och kan t.ex. uttryckas som att "mjukvaran skakar liv i hårdvaran". Verktyg för både utveckling, test och inte minst kommunikation mellan personer blir kontinuerligt allt viktigare och idag räcker det inte med kompilatorer och testverktyg utan även s.k. "social tools" är nödvändiga för att lyckas med sina stora projekt.

Som exempel nämnde Peggy att en enkel social tjänst som  Twitter är ett verktyg som används flitigt av stora mjukvarugrupper för att hålla sig uppdaterade om det senaste i branschen. Samtidigt ser nya programspråk och nya verktyg kontinuerligt dagens ljus. Andra sociala verktyg som "Stack Overflow", en avancerad användarbaserad Q&A-community, har blivit extremt viktiga för utvecklarna och många menar att dagens komplexa mjukvaruutveckling fungerar inte utan dessa. Ljuset släcks på kontoret helt enkelt.

Professor Storey resonerade också runt intressanta överblicksbilder om hur människor kommunicerar i såväl den fysiska analoga världen som i den digitala och inte minst med hjälp av sociala medier. Allt från samtal ansikte mot ansikte, böcker, email, LinkedIn, Basecamp, GitHub, Stack Overflow, Skype, Google Hangouts och mycket mer sattes i ett snyggt sammanhang. I grunden är vi ganska enkla i vår mänskliga kommunikation men sätten och verktygen är många.  Ett intressant citat som fastnade var "The best way to get the right answer on the internet is not to ask a question but to post the wrong answer".

Internets mekanismer är outgrundliga.


EIT do prestigious math conferences

Publicerad: 2017-05-03


Text and layout: Anders Borgström

EIT is taking part in organizing upcoming Mittag-Leffler conferences and Associate Professor Michael Lentmaier says: -We are happy that EIT is involved in the organization of not only one but two workshops at Mittag-Leffler this year.

It's truly international and high-level conferences with top-level mathematicians and participants arriving from many research institutes and universities world-wide. Countries represented are US, France, China, Switzerland, Israel, UK, Canada, Iceland, Sweden, Norway and Finland. And a few more not to be forgotten.

Herglotz-Nevanlinna functions

The first conference where Professor Mats Gustafsson is co-organizer,  runs May 8 to May 12 and is titled "Herglotz-Nevanlinna functions and their applications" and will bring together mathematicians, physicists, and engineers who are interested in bounded analytic interpolation. The focus lies on Herglotz-Nevanlinna functions in connection with passive, causal, and active systems (in particular, electromagnetic design, composite materials, and Dirichlet-to-Neumann maps) and hence the main tools are within complex analysis and  functional analysis as well as convex optimization.

Information and coding theory

The second conference where Michael Lentmaier is co-organizer is running May 15 - May 19 and is titled "Information theory and coding theory with applications to data security and privacy". It will focus on how to apply information and coding theory towards providing security and privacy in systems.  Researchers and practitioners in information and coding theory and in network security and privacy will gather, with the goals of identifying open security and privacy problems that arise in networks and distributed storage systems and that can be effectively solved by proper coding techniques.

Information theory and coding theory have been instrumental in shaping our modern digital world.  Traditionally, information theory describes fundamental limits on the essential performance parameters of communication and storage systems, as they relate to the physical characteristics of the system. Coding theory however, is concerned with mathematical methods for designing practical systems that approach these fundamental performance limits. 

Math and applications

The program consists of subjects both deeply mathematical and more applied ones with topics like "Physical-layer security and 5G", "Secure distributed storage", "Arbitrary Linear Code", "Coding and cryptography", "Latency and security", "Network Information Theory and Combinatorics". And the list goes on.

Facts on Institut Mittag-Leffler:

Institut Mittag-Leffler is an international centre for research and postdoctoral training in mathematical sciences. It was founded in 1916 by Professor Gösta Mittag-Leffler and his wife Signe, who donated their magnificent villa, with its first-class library, for the purpose of creating the Institute that bears their name. 

Nice conference environments

The premises of Institut Mittag-Leffler encompasses several buildings on a park-like estate and the main building, originally the home of Gösta and Signe, is a beautifully preserved villa in the art nouveau style. 

Focus on Nordic math research

The mission of Institut Mittag-Leffler is to support international top-level research in mathematics, with special attention to the development of mathematical research in Nordic countries. It also has a responsibility to serve as a contact and link between the international research community. 

Activities and publications

Major activities of the Institute include research programs, conferences, workshops and summer schools. The Institute is responsible for publishing two research journals, Acta Mathematica and Arkiv för Matematik where the first one is one of the most prestigious mathematics research journals in the world. 



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