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Electrical and Information Technology

Faculty of Engineering LTH | Lund University

Event archive

Guest Lecture: Advanced SAR ADCs ? efficiency, accuracy, calibration and references

Published: 2017-10-26

Prof. Pieter Harpe from TU Eindhoven (NL) will deliver his SSCS Distinguished Lecture ?Advanced SAR ADCs ? efficiency, accuracy, calibration and references?

Speaker: Prof. Pieter Harpe from TU Eindhoven (NL)

Title: Advanced SAR ADCs ? efficiency, accuracy, calibration and references

Abstract: This lecture will discuss advanced techniques that enabled substantial performance improvement of SAR ADCs in recent years. After a brief introduction on SAR ADCs, a short overview of the recent trends will be given. Then, the presentation will show four design examples with different targets. The first topic deals with minimizing power consumption. The second and third design aim to increase accuracy by means of linearization, noise reduction techniques, and calibration. Finally, the last part describes an efficient method to co-integrate the reference buffer with the SAR ADC.

Short bio: Prof. Harpe is steadily producing world-class results in the field of CMOS SAR ADCs, with many outstanding ICs presented at the ISSCC and in JSSC. SAR ADCs are well-known to provide a great performance at reduced power consumption.

When: 2017-11-30 13:15 to 2017-11-30 15:00
Location: Room E:2311, Ole Römers Väg 3, LTH, Lund
Contact: pietro.andreani@eit.lth.se


 


Guest Lectures on Full Duplex Wireless, and High-Power and Energy-Efficient Millimeter-wave Circuits

Published: 2017-10-26

Prof. Harish Krishnaswamy from Columbia University (NY) will visit us and deliver not one, but two SSCS Distinguished Lectures: ?Full Duplex Wireless: From Integrated Circuits to Networks? and ?High-Power and Energy-Efficient Millimeter-wave Circuits and Systems for Next Generation Wireless?

Speaker: Prof. Harish Krishnaswamy from Columbia University (NY)

Related: In the morning of the same day, Prof. Krishnaswamy will be the opponent in Xiaodong Liu?s licentiate defense

Full Duplex Wireless: From Integrated Circuits to Networks

Abstract: Full duplex wireless is an exciting emergent wireless communication paradigm where the transmitter and the receiver operate at the same time and at the same frequency. Full duplex potentially immediately doubles wireless capacity at the physical layer, while offering greater flexibility and other benefits at the network layer. However, the fundamental challenge associated with full duplex is the tremendous transmitter self interference at the receiver that can be a billion to a trillion times more powerful than the desired signal. This presentation covers recent advances in the design of integrated RF and millimeter-wave full-duplex transceivers with self-interference cancellation in various domains ? antenna, RF, analog baseband and digital. This presentation will also cover developments from the Columbia FlexICoN project (http://flexicon.ee.columbia.edu), which is investigating network-layer implications of full duplex, cross-layering in full duplex networks and co-development of the physical layer and the network layer.

High-Power and Energy-Efficient Millimeter-wave Circuits and Systems for Next Generation Wireless

Abstract: There has been a renewed interest in millimeter-waves in the recent past for next-generation (5G) wireless communication networks. While millimeter-wave silicon systems-on-chip (SoCs) are a mature technology, there are several open challenges, including the generation of high output power to close link budgets over distances exceeding 100s of meters, and the implementation of energy-efficient millimeter-wave systems. This talk will cover recent research on stacked millimeter-wave CMOS power amplifiers with high efficiencies, watt-class millimeter-wave CMOS PAs, highly digital millimeter-wave transmitters, and large-scale millimeter-wave arrays. Finally, this talk will contemplate advanced wireless communication paradigms at millimeter-waves, including massive MIMO.

Bio

Harish Krishnaswamy received the B.Tech. degree in electrical engineering from the Indian Institute of Technology, Madras, India, in 2001, and the M.S. and Ph.D. degrees in electrical engineering from the University of Southern California (USC), Los Angeles, CA, USA, in 2003 and 2009, respectively. In 2009, he joined the Electrical Engineering Department, Columbia University, New York, NY, USA, where he is currently an Associate Professor. His research interests broadly span integrated devices, circuits, and systems for a variety of RF, mmWave. sub-mmWave and opto-electronic applications. Recent research topics include breaking Lorentz reciprocity and related applications, full-duplex wireless, high-power and energy-efficient millimeter-wave circuits and systems in silicon, broadband/reconfigurable RF radios with an emphasis on interference mitigation, and terahertz circuits in CMOS. Dr. Krishnaswamy serves as a member of the Technical Program Committee (TPC) of several conferences, including the IEEE International Solid-State Circuits Conference (2015/16-present) and IEEE RFIC Symposium (2013-present). He was the recipient of the IEEE International Solid-State Circuits Conference (ISSCC) Lewis Winner Award for Outstanding Paper in 2007, the Best Thesis in Experimental Research Award from the USC Viterbi School of Engineering in 2009, the Defense Advanced Research Projects Agency (DARPA) Young Faculty Award in 2011, a 2014 IBM Faculty Award and the 2015 IEEE RFIC Symposium Best Student Paper Award - 1st Place.

When: 2017-11-20 13:00 to 2017-11-20 16:00
Location: Room E:2517, Ole Römers Väg 3, LTH, Lund
Contact: pietro.andreani@eit.lth.se


 


Licentiate Thesis seminar: Blocker-Tolerant Continuous-Time Delta-Sigma Modulator for Wireless Communication by Xiaodong Liu

Published: 2017-10-20

Title: Blocker-Tolerant Continuous-Time Delta-Sigma Modulator for Wireless Communication

Presentetd by: Xiaodong Liu

When: November 20, 2017 10:00

Place: E:3139, Institutionen för Elektro- och informationsteknik, E-huset, LTH
 
Special reviewer:
Lektor Harish Krishnaswamy, Columbia University, New York, USA
Supervisor: Universitetslektor Pietro Andreani, EIT
Examinator: Universitetslektor Joachim Rodrigues, EIT
 
Abstract
The wireless communication industry has witnessed explosive growth over the last decade. The spread of mobile devices like smartphones demands power efficient receiver front-end with high level of integration in cost efficient semiconductor technology like CMOS process, which makes the direct conversion receiver a dominant receiver architecture in the mobile communication for its reduced number of filtering and frequency translating stages. As high data rate demands larger bandwidth and the lack of filtering necessities high dynamic range, continuous-time (CT) Delta-Sigma modulator (DSM) has become a compelling choice for implementing the analog-to-digital converters (ADCs) to enable a power efficient wireless receiver.

This thesis investigates the design of CT DSM ADC for wireless communication from two perspectives. The first perspective is to map the full scale of DSM's quantizer to the less filtered blockers level and optimize the quantization noise performance of CT DSM so that the blockers are accommodated within the dynamic range of DSM. The second perspective is to incorporate the ADC with the filter through global feedbacks, which results in an A/D channel-select filter (ADCSF). Therefore the strong blockers are sufficiently attenuated before they present at the quantizer input. Moreover, the global feedbacks provide additional shaping of ADC noise, which can be utilized to optimize the power/noise performance.

Both approaches are implemented in 65nm CMOS process and practical design considerations are discussed in the thesis. The first prototype achieves 64 dB dynamic range and consumes 9mA from 1.2V power supply, which result in a figure-of-merit (FOM) of 225 fJ/conversion. The second prototype has a 4th-order Butterworth filter response with the cut-off frequency at only 1.36 times the signal bandwidth to achieve a sharp filtering. The additional noise shaping on the quantization noise provided by the global feedbacks is around 23 dB. The second prototype is also integrated into the single chip direct conversion receiver where the RF-to-digital performance is fully characterized. The receiver with ADCSF demonstrates overall state-of-the-art performance.

When: 2017-11-20 10:00 to 2017-11-20 12:00
Location: E:3139, Institutionen för Elektro- och informationsteknik, E-huset, LTH
Contact: anne.andersson@eit.lth.se


 


IVA-seminarium: Ryktet om radioteknikens död är starkt överdrivet

Published: 2017-10-19

Med jämna mellanrum spås olika teknikområdens stagnation eller plötsliga död. Radiotekniken är inget undantag. Så sent som 2011 ställdes frågan om stagnation inom all kommunikationsteknik. Man konstaterade att medan den tillgängliga beräkningskraften i kommunikationsutrustning växt fyrtio miljoner gånger sedan 1957 hade datahastigheterna bara ökat en miljon gånger.

5G Basstation
Vid samma tid arbetade en forskare vid Bell Laboratories på en ny och förvånande enkel idé: Om vi rejält ökar antalet antenner på våra mobilmaster kan vi mångfaldiga datahastigheterna. Som om detta inte var nog gav den nya tekniken ytterligare tre fördelar ? betydligt svagare radiosignaler kan användas, förbindelsen blir mycket mer pålitlig och terminaler/mobiler kan byggas med enklare och billigare teknik. Dessa nya forskningsrön möttes då av stor skepsis.

I Sverige fanns forskare som redan innan 2011 fick upp ögonen för den nya tekniken och började undersöka dess möjligheter och begränsningar. Seminariet berättar om vägen från en en teori som verkade för bra för att vara sann till verkliga tester som visar vägen mot 5G och framtida generationers mobilkommunikation.

Kvällen inleds med ett föredrag om 5G och därefter följer ett besök i labbet där vi tittar på framtidens mobila kommunikation i verkligheten. Det system vi får se har utvecklats vid LTH och har för närvarande världsrekord i effektiv dataöverföring ? 22 gånger bättre än dagens 4G.

Medverkar gör Ove Edfors och Fredrik Tufvesson, båda professorer i radiosystem vid LTH.

Mer information och anmälan: http://www.iva.se/event/ryktet-om-radioteknikens-dod-ar-starkt-overdriven/

When: 2017-11-08 17:00 to 2017-11-08 19:00
Location: E-huset, LTH (Rum: E:2311), Ole Römers väg 3, Lund


 


seminar: Breaking conventional bounds in electrically small antenna systems using direct antenna modulation

Published: 2017-09-18

Speaker: Kurt Schab, NC State University

Title: Breaking conventional bounds in electrically small antenna systems using direct antenna modulation
 
When: Thursday 21/9 15.15-16
 
Where: E:3139
 
Abstract:
As an antenna becomes electrically small, its performance rapidly decays. This limitation has been a topic of heavy research and debate in the antennas and propagation community over the last 70+ years.  This is because the bounded bandwidth of electrically small antennas can be a key limiting factor within a communications link as it directly limits the bandwidth of signals which can be transmitted or received. This research studies a new class of transmitting antenna systems with properties outside the normal assumptions used in deriving the bounds on electrically small antennas. Such systems utilize "direct antenna modulation" (DAM) wherein an antenna or its matching network is made non-linear or time-varying in order to enable the transmission of extremely high-bandwidth, high-data rate signals.
 
Our work has three main objectives in analyzing, refining, and realizing direct antenna modulation techniques in novel ways. First, we study the theoretical justification for simple, heuristic DAM schemes through comparison with derived optimal (yet non-realizable) solutions. Second, we exploit certain nuances of a popular computational electromagnetics technique (Method of Moments) to facilitate the simulation and evaluation of general DAM systems in a much faster and more efficient manner than was previously possible. These computational advances not only aid in the study of new and optimized DAM schemes, but also add physical understanding to phenomena previously lacking quantitative explanation. Finally, a key goal of this research is to validate the functionality of a DAM transmitter in a realized communication link. Promising experimental results show that conventional bounds are easily broken using direct antenna modulation, indicating this technology has the potential to be a major disruption to the established ways of using electrically small antennas.
 
This presentation will briefly cover background on direct antenna modulation, key results from our research, and future directions for the field.
 
 
Bio:
Kurt Schab is a post-doctoral research fellow at North Carolina State University. He earned a B.S. in Electrical Engineering and a B.S. in Physics from Portland State University in 2011. He completed his M.S. and Ph.D. in Electrical Engineering in 2013 and 2016, respectively, from the University of Illinois at Urbana-Champaign. His area of research is applied electromagnetics, with particular focus on time-varying antenna systems and the intersection of numerical methods with antenna theory.

 

When: 2017-09-21


 


Seminar by Professor Yasuyuki Miyamoto “Tunnel FET for low power / high speed application”

Published: 2017-09-11

Speaker: Professor Yasuyuki Miyamoto, Department of Electrical and Electronics Engineering,  Tokyo Institute of Technology

When: september 15, 2017 at 10.15’

Where: E:2349

Short bio: Prof. Miyamoto has  a long experience in transistor processing and characterization and he is  very active  in the Japanese as well as the international conference organizations.

Abstract
Tunnel FETs with a sub-60-mV/dec subthreshold slope (SS) have been proposed as transistors for CMOS logic circuits. Since the high-speed operation of CMOS circuits requires a high drive current, introduction of heterojunctions in the tunnel FETs is an attractive option.

As high electron mobility provided by InGaAs channels can result in a high current density, we have studied the InGaAs/GaAsSb type-II heterojunction double-gate tunnel FETs. To obtain high current density, heavily doping in source is essential for low access resisitance. On the other hand, lower drain doping is effective to obtain low off-current as the minimum current of tunnel FETs is determined by the ambipolar behavior. Moreover, the reduction of the channel length of MOSFETs is attarctibe becuase it decreases the gate capacitance and lowers the dynamic power consumption. However, the direct source-to-drain tunneling increases in the case of short channels and it may be the dominant tunneling mechanism of off-state currents. Thus,we classified the tunneling current based on numerical simulations.

Present expermental status of InGaAs/GaAsSb type-II heterojunction double-gate tunnel FETs by top-down process is also explained.. 

For further scaling,body width of semiconductor is one of the limitation. Thus 2D-semiconductor, such as transition metal dichalcogenides (TMDs) is promisinng materials. Among the TMD materials, HfS2 has a high electron affinity so that type-II heterojunction can be formed with other TMD materials. Thus we experimentally demonstrated a vertical HfS2/MoS2 van der Waals (vdW) heterostructure transistor. 

When: 2017-09-15


 


The SSF Photonics and Electronics Conference 2017

Published: 2017-06-26

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The SSF Photonics and Electronics Conference 2017 is held in Lund on September 7, directly after the

circuit design workshop.

 

For details, see: http://stratresearch.se/en/events/photonics-electronics-conference-2017/

When: 2017-09-07 10:00 to 2017-09-07 17:00
Contact: Pia.Bruhn@eit.lth.se


 


2017-09-07 The Photonics and Electronics Conference

Published: 2017-09-04

SSF has the pleasure to invite you to a conference filled with interesting speakers and rewarding meetings. Listen to our key note speakers, starting with Dr. Walter Riess, the Head of the Science & Technology department at IBM Research. And be inspried by the presentations of  eight  framework grant projects supported by SSF.

When: September 7. 2017

Where: Elite Hotel Ideon, Scheelevägen 27, Lund

Read more and register at: http://strategiska.se/en/welcome-photonics-electronics-conference-september-7-2017/ 

When: 2017-09-07

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Lund Circuit Design Workshop 2017

Published: 2017-06-22

Welcome to the 2017 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.

Invited speakers

  • Bob Verbruggen, Xilinx
  • Marian Verhelst, KU Leuven
  • Heiner Linke, NanoLund
  • Michal Stala, ARM
  • Herbert Zirath, Chalmers
  • Marianne Larsson, Innovation Skåne

The workshop is hosted by the VINNOVA Industrial Excellence Center in System Design on Silicon (SoS).

Cost: free of charge!

More information: http://cdworkshop.eit.lth.se

Registration: Please register no later than 13 August, 2017 at: http://cdworkshop.eit.lth.se/index.php?gpuid=305

Note: The SSF Photonics and Electronics Conference 2017 is held in Lund on September 7, directly after the circuit design workshop. You may also want to register for this free-of-charge event. For details, see: http://stratresearch.se/en/events/photonics-electronics-conference-2017/

 

 

When: 2017-09-05 09:30 to 2017-09-06 15:00
Location: Grand Hotell, Lund
Contact: Pia.Bruhn@eit.lth.se


 


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