PhD dissertation by Therese Forsberg: Efficient mm-Wave Transmitter Design in CMOS Technology
Author: Therese Forsberg
Thesis title: Efficient mm-Wave Transmitter Design in CMOS Technology.
Main supervisor: Markus Törmänen
Faculty opponent: Piet Wambacq from IMEC
When: 13 December at 9:15
Loaction: Lecture hall E:1406, building E, Ole Römers väg 3, Lund
An increasing demand of higher data rates in wireless communication forces the industry to look to higher frequencies to find the required bandwidths. This thesis is about analog transmitters in CMOS for millimeter-wave communication, and it focuses on improving power amplifiers and frequency generation circuits, and increase their efficiency. This thesis starts with an introduction to millimeter-wave transmitters in CMOS, standards and beamforming. It then continues with a brief introduction to millimeter-wave power amplifier design and design of local oscillators at millimeter-wave frequencies. The last part of the thesis consist of six papers, which present eleven manufactured and measured millimeter-wave circuit designs. Paper I presents a two-stage, 65-nm CMOS, Class-A PA for the 60-GHz band. It employs capacitive cross-coupling neutralization for higher differential isolation and gain, without the need to increase the power consumption. It achieves 18.5 % peak-added-efficiency. Paper II presents a varactorless VCO in 65 nm CMOS, operating in the 60-GHz band. In paper III, the efficiency of the popular source-node filtering technique for improved phase-noise performance is investigated through measurements of two same-chip 60-GHz VCOs in FD-SOI CMOS. The filtered VCO achieves a state-of-the-art figure-of-merit of -187.3 dBc/Hz. Paper IV presents two FD-SOI CMOS VCOs for the 30-GHz and the 60-GHz band, that achieve ultra-low power consumption, also at full supply voltage. In paper V, a phase-locked loop in 28-nm FD-SOI CMOS for 5G transceiver systems is proposed. Its VCO operates at around 55 GHz. The paper describes the disadvantages of using a too high input reference frequency, but also proposes a new architecture that handles the increased settling time by mode-switching. It also includes a novel charge-pump current-mismatch mitigation technique based on feedback, and a novel wideband and low-power injection-locked divide-by-three circuit. The phase-locked loop consumes only 10 mW of power, has an integrated jitter of 176 fs, and demonstrates a state-of-the-art figure-of-merit of -245 dB. Paper VI describes a wideband injection-locked divide-by-two circuit in 28-nm FD-SOI CMOS. It achieves a locking range of 30 % at the low power consumption of 4.3 mW.
|When:||2018-12-13 09:15 to 2018-12-13 09:15|
|Location:||Lecture hall E:1406, building E, Ole Römers väg 3, Lund|
Seminar: Adaptive and reconfigurable antennas for mobile communications (Prof. Ville Viikari)
Preseated by: Associate Professor Ville Viikari from Aalto Universit, and opponent at Alexander Bondarik's defence
Topic: Adaptive and reconfigurable antennas for mobile communications
Time: Fri Oct 5 at 14.15
|When:||2018-10-05 14:15 to 2018-10-05 14:15|
|Location:||E-huset, Ole Römers väg 3. Start in EIT Lunch-room (E:2311)|
PhD Dissertation: Microstrip Antennas for 60 GHz Band Application
Author: Alexander Bondarik
Opponent: Ville Viikari, Associate Professor at Aalto University, Finland
When: 5 October at 10.15
Loaction: Lecture hall E:1406, building E, Ole Römers väg 3, Lund University, Faculty of Engineering LTH, Lund
Thesis abstract: The next generation of mobile networks will exploit frequencies above 5 GHz and will use a wide available bandwidth for high speed data communication. At the time of writing this thesis work is ongoing to launch into the market a communication system operating between 25 GHz and 30 GHz. Following news about 40 GHz spectrum acquisition by telecommunication companies, it will be the next in turn. At the same time there is a continued interest on frequencies around 60 GHz, with potential applications not limited by mobile networks. The main reason for this development is that there is about 7 GHz of available unlicensed bandwidth around the world due to the electromagnetic waves absorption peak in the atmosphere.
This dissertation is devoted to microstrip antenna design at 60 GHz band. The main challenge addressed in the thesis is a wideband antenna design with high directivity and efficiency to overcome the free space propagation loss and atmosphere attenuation. In ddition, the presented antennas are suitable for a reliable fabrication and have small thickness, which might be critical for the antenna integration. A single antenna and an array antenna are designed and manufactured. A wideband high gain antenna and an array design on a ceramic substrate, which is suitable for multilayer fabrication and system integration is presented in Paper I. A novel gridded parasitic patch microstrip antenna design and fabrication on a polytetrauoroethylene substrate is presented in Paper II. A comparison with similar conventional antenna designs is provided showing better characteristics for the designed antenna. During the antenna measurements the effect of surface waves propagation was identified. To suppress this unwanted radiation an electromagnetic band-gap structure around the antenna is designed and manufactured, the results are presented in Paper III. Two array antenna configurations for the gridded parasitic patch antenna are presented in Paper IV.
The second topic of the dissertation is an investigation of reconfigurability of a gridded parasitic patch antenna pattern. The principles using switches and varactors implementation are discussed in Paper II. The results of the proof-of concept fabrication using narrow etal strips imitating switch connection are presented in Paper V. An implementation using Schottky diodes as switches is presented in Section 5 of the introduction part of the thesis.
The third topic of the dissertation is an antenna integration with a power amplier using bond wires. In Section 6 of the introduction part a planar antenna array integration with the injection locked power amplifier is presented. In Paper VI the same antenna is integrated with a two-stage power amplifier. Simulated and measured results are presented.
|When:||2018-10-05 10:15 to 2018-10-05 10:15|
|Location:||Lecture hall E:1406, building E, Ole Römers väg 3, Lund University, Faculty of Engineering LTH, Lund|
AIML workshop: Academy-Society Collaboration
Workshop on academy-society collaboration on artificial intelligence and machine learning.
9.30 Coffee and mingle
10.15-12.00 Mornings session
12:00-13:15 Lunch sandwich in the foyer
12.30 Mingle, exhibition, posters, workshops, demos etc.
14.15 Wrap-up in plenum
14.50 Upcoming events
15.00 and onwards Coffee and continued discussions in the foyer
Programme web page: http://aiml.lu.se/events/2018-09-26-collaboration/
|When:||2018-09-26 09:30 to 2018-09-26 15:00|
|Location:||MA:6, Matteannexet, Sölvegatan 20, Lund|
IoT with a soft touch
We invite you to get inspired and share ideas on the soft touch of IoT. This technology can be easily designed to fit in many applications serving our society and a sustainable future.
The program will include:
- Topical talks on technologies and applications
- Fika blended with real-life (inter)net-of-people-and-things
- Interactive panel discussion and wrap-up
The event is supported by the equal opportunities program and Lise Meitner professorship of Lund University. We are looking forward to welcoming diverse participants.
Registration is required (free of charge).
The IoT with a Soft Touch Workshop is organised in connection with the Lund Circuit Design Workshop 2018 and we encourage participants to attend both workshops. https://www.lu.se/event/lund-circuit-design-workshop-2018
Call for posters
PhD students attending the workshop are invited to present posters describing their researh. For poster submission, see the workshop website.
- Vanja Pilcanic Samuelsson, Founder, QOITECH
- Anders Trana, Project Leader for Smart Open Environments, Lund Open City Sensor Network
- Linh Trang, Master Research Engineer in Network Technology & System Architecture, Sony Mobile
- Georgina Wilcox, Traffic-Team Site Reliability Engineer, Google
- Liestbet van der Perre, KU Leuven/Lund University
- Emma Fitzgerald, Lund Unviersity
- Ove Edfors, Lund University,
- Sara Gunnarsson, Lund University
- liesbet [dot] vanderperre [at] kuleuven [dot] be
- emma [dot] fitzgerald [at] eit [dot] lth [dot] se
|When:||2018-09-25 13:15 to 2018-09-25 17:00|
Lund Circuit Design Workshop 2018
Welcome to the 2018 Lund Circuit Design Workshop
The workshop will offer an overview of research activities in IC design at Lund University. Additionally, invited presentations on related subjects will be given by outstanding experts from both academia and industry.
The workshop is hosted by the Lund University xcellence Center in System Design on Silicon (SoS).
Cost: Free of charge!
More information: http://cdworkshop.eit.lth.se
Registration: Please register no later than 7 September, 2018 at: http://cdworkshop.eit.lth.se/index.php?gpuid=305&L=0
|When:||2018-09-24 09:30 to 2018-09-25 15:00|
|Location:||Grand Hotell, Lund|
Radio Based Positioning - Digit@LTH seminar by Prof. Fredrik Tufvesson
Topic: On Radiobased Positioning
When: 20 September at 9.00-10.00
Where: Lund university, E-huset, Ole Römers väg 3. Start in EIT Lunch-room (E:2328)
Positioning and localization are becoming more and more important in our everyday life. GPS and other satellite-based solutions provide possibilities to locate ourselves and GPS enabled devices, but there is a need for higher accuracy, low cost solutions and more robust performance in challenging scenarios such as indoors and in street canyons where the satellites are shadowed by the buildings. In this talk, we discuss the fundamentals of radio based positioning and how we can use cellular signals to perform positioning and localization in a new way with improved performance. We discuss current trends in 5G and how they will influence positioning and localization possibilities. Finally, we also discuss how machine learning can be used to learn the details of the radio environment to complement camera or Lidar based positioning.
Fredrik Tufvesson received his Ph.D. in 2000 from Lund University in Sweden. After two years at a startup company, he joined the department of Electrical and Information Technology at Lund University, where he is now professor of radio systems. His main research interest is the interplay between the radio channel and the rest of the communication system with various applications in 5G systems such as massive MIMO, mm wave communication, vehicular communication and radio based positioning.
Fredrik has authored around 80 journal papers and 140 conference papers, he is fellow of the IEEE and recently he got the Neal Shepherd Memorial Award for the best propagation paper in IEEE Transactions on Vehicular Technology and the IEEE Communications Society best tutorial paper award.
|When:||2018-09-20 09:00 to 2018-09-20 10:00|
|Location:||E-huset, Ole Römers väg 3. Start in EIT Lunch-room (E:2328)|
Lic. Seminar: Improving Throughput and Minimising Age of Information in dense WLANs, Using Cooperative Techniques by Antonio Fra
Title: Improving Throughput and Minimising Age of Information in dense WLANs, Using Cooperative Techniques
Presenter: Antonio Franco - see portal.research.lu.se
Reviewer: Professor Markus Fiedler, Blekinge Institute of Technology (BTH)
Supervisor: Professor Björn Landfeldt, EIT
Examiner: Universitetslektor Erik Larsson, EIT
Mobile and wireless data are in increasing demand worldwide. New trends such the Internet of Things paradigm and the Smart City paradigm describe scenarios comprising thousands of devices all exchanging informations between each others wirelessly ? or through the WAN to another device, possibly connected to another WLAN. Operators and radio engineers are faced with the problem of designing efficient ways to share the electromagnetic spectrum ? a scarce and expensive resource ? between thousands of devices.
In this context, operators look at the unlicensed spectrum as possible solu- tion to complement the existing infrastructure. Unfortunately, the IEEE 802.11 MAC family, the most widespread MAC protocol in the unlicensed portion of the spectrum, still suffers when managing a large number of interconnected devices. In this thesis we are both addressing the open problems in the IEEE 802.11 MAC scheme and our contributions on their solution.
Specifically, in the first part of the thesis we are going to present the IEEE 802.11 MAC scheme and the challenges it faces, along with solutions already present in literature. We are also going to show a new metric recently defined in literature called the Age of Information (AoI). This new metric is a measure how fresh is the piece of information stored in a remote receiver. It received interest in the literature, but little is known how it behaves in a IEEE 802.11 WLAN.
In the second part of the thesis we present two papers that try to address the problem of designing new protocols that let the devices cooperate in order to achieve a common goal. They specifically focus on two metrics. The first paper addresses throughput and collisions reduction through a new MAC scheme that uses RSSI to identify other devices in a WLAN, and uses a priority base access system in order to cooperate in turns with them. We show, through simulation, that this scheme outperforms the classical IEEE 802.11 DCF mode of operation, especially in WLANs subject to high loads.
The second paper addresses the AoI both in terms of average and variance, for sensor nodes immersed in a dense WLAN that send pieces of information to a remote server via a WAN connection. We study both those metrics for a link with high variance and low variance delay. We construct and test, via means of simulations, an AoI-aware MAC, called LUPMAC - Latest Update Medium Access Scheme, aimed at reducing both the average AoI and the AoI variance at the remote server side, being also resilient to variations on the wired remote connection.
In those two papers we present two schemes suitable for the unlicensed spectrum environment, addressing both scheduling and queuing policies. They are only slight modifications to the already widely deployed IEEE 802.11 MAC. They significantly improve the metrics they focus on. They tend not to rely on a centralized unit, as most random access schemes do, and let the devices cooperate to a certain extent in order not to pollute the channel with undesired retransmissions.
|When:||2018-08-22 13:00 to 2018-08-22 13:00|