Past Events

BEHAVIOURAL MODELING &

LINEARIZATION OF RF POWER AMPLIFIERS

Tuesday March 26th, 2013

2:00 – 3:00 pm: Presentation and Q&A

Jacobs Hall, Brooker Conference Room 2512

 PRESENTATION SLIDES

Dr. John Wood

Senior Principal Member of the Technical Staff, Maxim Integrated Products

Abstract:

In cellular wireless communications systems, the RF power amplifier (PA) in the transmitter must be as efficient as possible, to minimize energy costs, to prolong battery life, and for 'green' considerations.  Modern spectrally-efficient, digitally-modulated signals such as LTE and UMTS present a challenge for efficient RF PA design, and the power amplifier architectures that are adopted to achieve this goal are generally very nonlinear, and so some form of linearization technique is necessary.

The increasing use of linearization techniques, and especially the emergence of high speed digital processing as an enabling technology to implement digital pre-distortion (DPD) of the PA input signal, represent an important paradigm shift in PA design. The PA component can now be designed with more emphasis on power and efficiency, without the traditional constraints of meeting stringent linearity specs simultaneously. Understanding the utility of a linearizer to obtain optimum efficiency has thus become a new subject area in modern RF PA design.

The system-level design of linearized PA transmitters requires accurate models to achieve the optimal performance.  Behavioural modeling is used to describe the PA and linearizer at this level of the design.  In this lecture, we shall present some approaches to the behavioral modeling of nonlinear dynamical systems that can be used to model RF PAs; particular emphasis will be given to the treatment of memory effects. Some common mathematical and systematic approaches to model generation will be presented, to obtain accurate but compact nonlinear dynamical models. A brief description of some characterization techniques will be included.  These same nonlinear modeling techniques can be applied to the design of successful pre-distortion algorithms.  We shall illustrate the overall structure of a linearized transmitter using several DPD architectures, and we shall present various approaches to adaptive pre-distortion, considering such features as convergence, signal bandwidth, accuracy, and cost.

Biography:

John Wood received B.Sc. and Ph.D. degrees in Electrical and Electronic Engineering from the University of Leeds, UK, in 1976 and 1980, respectively.  He is currently Senior Scientist in Maxim Labs at Maxim Integrated Products, Inc, Sunnyvale, CA, where he is working on Envelope Tracking and Digital Pre-Distortion systems for wireless communications applications.  He was formerly a Distinguished Member of the Technical Staff responsible for RF System & Device Modeling in the RF Division of Freescale Semiconductor, Inc, Tempe, AZ, USA.  His areas of expertise include the development of compact device models and behavioural models for RF power transistors and ICs, and linearization and pre-distortion of high-power amplifiers.  To enable and support these modeling requirements, he has been involved in the specification of high power pulsed I-V-RF test systems, for connectorized and on-wafer applications, and in the development of large-signal network analyzer (LSNA), loadpull, and envelope measurement techniques.  From 1997-2005 he worked in the Microwave Technology Center of Agilent Technologies(then Hewlett Packard) in Santa Rosa, CA, USA, where his research work has included the investigation, characterization, and development of large-signal and bias-dependent linear FET models for millimetre-wave applications, and nonlinear behavioural modeling using LSNA measurements and nonlinear system identification techniques.  Between 1983 and 1997 he was a Professor in the Department of Electronics at the University of York, UK, where his research and teaching interests covered semiconductor devices, RF and microwave circuits, IC design, and device modeling.

He has organized, co-organized, and presented at many workshops at IMS and RWS in recent years; he was on the Steering Committee for IMS 2006, and has been a member of the IMS Technical Program Committee for the past four years, currently Chair of SC-20 'High-Power Amplifiers'. He has been a member of the ARFTG Executive Committee from 2007-10, was the Technical Program Chair for the 70th & 75th ARFTG Conferences (2007, 2010), and the General Chair for the 78th ARFTG Conference in Fall 2011.  He was Technical Program Chair for the IEEE Power Amplifier Symposium 2008, 2010, and was General Chair in 2009 and 2011. He is a regular reviewer for IEEE Transactions on Microwave Theory & Techniques, on Electron Devices, and on Circuits & Systems. He is author or co-author of over 120 papers and articles in the fields of microwave device and system modeling and characterization, and microwave device technology.  He is the co-author of Modeling and Characterization of RF and Microwave Power FETs (Cambridge, 2007), and co-editor of Fundamentals of Nonlinear Behavioral Modeling for RF and Microwave Design (Artech House, 2005). He received the ARFTG Technology Award in 2007.  He is a Fellow of the IEEE, and a member of the Microwave Theory and Techniques, and Electron Devices Societies.



Monday August 13th, 2012
3pm - 5pm
Jacobs Hall, Brooker Conference Rm 2512

  1.  Professor Cheng will present High-Temperature Glass Based Phosphor–Converted White Light-Emitting Diodes for Next-Generation Solid-State Lighting
  2. Professor Cheng will present "Chromium-Doped Fiber Amplifiers for Next-Generation Optical Communications"
  3. Professor Horng, also of Taiwan, will present:  “Process Development of High Brightness InGaN Light-Emitting Diodes”
  4. Professor Huang, again of Taiwan, will present "Recent Developments in Electronic and Optoelectronic Device Fabrication and Characterizations"



When: Saturday, June 2nd, 2012 12-3 p.m.
 
IEEE San Diego Section Picnic
 
Where: Playa Pacifica at Mission Bay
Who:  IEEE Student (undergraduates & graduates) members, GOLD members, 
Professional members.
CostFREE for IEEE members, $5 for non-IEEE members

There will be FREE FOOD, entertainment, and friends!

Friday, April 27th 2012

 

IEEE Graduate Student Chapter at UCSD presents:

 

Millimeter-Wave Power Amplifier Design using GaN MMICs

 

James M. Schellenberg,

Chief Engineer, QuinStar Technology

 




January 12th, 2012: Radiated Spurious Emissions (RSE) Testing for Wireless Devices: A Tutorial on the History of the Test and How to Perform It".

Location
: Jacobs Hall Rm 2512

Time
: 5:30 dinner; 6:30 presentation

Speaker
: Jari Vikstedt, ETS‐Lindgren

RSVP
: Register to attend by contacting Phil Strong no later than Tuesday, January 10
Office: 909.460.1861 Cell: 909.214.9572 e‐mail: pastrong@atsemc.com

PLEASE SEE FLYER AT THE BOTTOM OF THE PAGE FOR MORE DETAILS!  


Dec 1, 2011: Development and Application of a New Generation of Semiconductor Lasers


Wednesday, November 30, 2011

IEEE San Diego CPMT, Photonics and AP/ED/MTT/SSC Society Joint Meeting:

 

Development and Applications of a New Generation of Semiconductor Lasers

 

Speaker:  Bob Shine, PhD

 

ABSTRACT:

Quantum Cascade Lasers (QCLs), first demonstrated in 1994, are a new class of semiconductors lasers that offer emission in the mid-IR portion of the spectrum.  QCLs combine many of the features of the ubiquitous visible and near-IR diode lasers with some unique benefits that make QC lasers rich in performance and potential.  A key difference is the unipolar nature of the device where a single electron can emit multiple photons by ‘cascading’ down the multiple quantum wells within the conduction band of the structure.  This leads to high power and high efficiency devices, and several watt operation from a single QCL has been demonstrated.  The QCLs also have a broad gain bandwidth, and external cavities incorporating QCLs allow broad tunability with narrow linewidths. One difference that presents a challenge is the thermal property of the QC lasers, which creates unique mounting and packaging challenges.  The development of products based on QCL technology will be discussed, with applications covering scientific, defense, and industrial applications. 

 

BIO:

Bob Shine received his Ph.D. in laser physics from Stanford University under the direction of Professor Robert Byer.  Dr. Shine received both his undergraduate and masters degrees from Harvard University in Chemistry and Physics.  During his professional career, he has worked with a range of laser technologies and multiple industries, including scientific research, telecommunications and medical lasers.  His current role is Senior Director of Commercial Business Development at Daylight Solutions where he is responsible for developing markets for Mid-IR molecular detection and imaging using quantum cascade lasers.

 

Agenda:

6:00 – 6:30 PM:  Networking and food

6:30 – 8:00 PM:  Presentation and Q & A

 

Location:

UCSD Extension, Mission Valley Center, 404 Camino Del Rio South, Suite 102, San Diego, CA 92108

 

Directions:

http://extension.ucsd.edu/pdf/student/MissionValleyDirections.pdf

 

Cost:

Free for IEEE members, $5.00 for non-members

 

RSVP:

Register

 

Questions:  Contact Steve Smiley @ ssmiley@ieee.org

 

Information on this and other meetings can be found at www.sdieee.org



Commercializing Silicon on Sapphire: October 7, 2011

Speaker: Ron Reedy, Ph.D, UCSD '83 Co-Founder and CTO, Peregrine Semiconductor
Topic: Commercializing Silicon on Sapphire
Time: 11:00am - 12:00pm, October 7, 2011
Location: Jacobs Hall, Lobby, Qualcomm Conference Suite

CLASTECH 2011 for Antenna and Microwave Talks: October 28, 2011, LA

Join us at CLASTECH 2011 for Antenna and Microwave Talks.  Pass the word.

Mark your calendar for Friday, Oct. 28, 2011, from 8:30 AM to 3:30 PM, for the 2011 CLASTECH Meeting. The format will be the same as the previous years, with engaging talks, table top exhibits, and good food, for $30 onsite, or $15 pre-registration.

Sign up at http://meetings.vtools.ieee.org/meeting_registration/register/7711
Check out the new web based registration system that we are using.

For this year's flyer go to http://home.earthlink.net/~clastech/clastech.pdf

Check for the meeting notice on the CLAS Calendar web
page: http://ewh.ieee.org/r6/coastal_la/calendar.html

For the MTT talks, speakers include Christopher P. Silva, from The Aerospace Corporation, Franco De Flaviis, from UCI, Ethan Wang, from UCLA, and Manos Tentzeris, Georgia Institute of Technology

The APS talks that have been arranged include Joseph Colburn, from HRL, Randy Haupt, from Ball Aerospace & Technologies, Yahya Rahmat-Samii, from UCLA, Fayez Nima, TECOM Industries, Inc, and Jin-Fa Lee, from Ohio State University

Vesna Radisic
IEEE MTT LA Coastal Section Chapter Chair

Technical Attendee Registration
http://meetings.vtools.ieee.org/meeting_registration/register/7711
(PayPal and Credit Cards accepted.)

Exhibitor Pre-Registration
http://clastech2011ex.eventbrite.com/



IEEE EDS Distinguished Lecture Series: August 22, 2011

Distinguished Lecturer: Prof. Wood-Hi Cheng,  Department of Photonics, National Sun Yat-sen University, Taiwan
Topic: The Art and Science of Packaging High-Coupling Photonics Device and Modules
Time: 11:00am - 12:00pm, August 22 (Monday)
Location: Booker Conference Room (Room 2512) in Jacobs Hall (formerly EBU1)

IEEE EDS Distinguished Lecture Series: April 25, 2011

Distinguished Lecturer: Prof. Yue Kuo, IEEE Fellow, Texas A&M University
Topic: TBD
Time: 11:00am - 12:00pm, April 25 (Monday)
Location: Booker Conference Room (Room 2512) in Jacobs Hall (formerly EBU1)

Mini-Colloquium at UCSD, March 25th, 2011 - PRESENTATION SLIDES

We'd like to give a big thank you to our wonderful speakers and awesome list of attendees.  With over 70 registered attendees, the Mini-Colloquium, hosted by the IEEE Graduate Student Chapter, resulted in a big success.  

It is our pleasure to share with you the presentations slides, courtesy of our speakers, below.

Below is the speakers' list, as well as the topics of their talks.

  • Dr. Fernando Guarin, IEEE fellow, IBM Microelectronics
    • Topic: Semiconductor Reliability Topics for Advanced CMOS Technologies
  • Prof. Madhu S. Gupta, IEEE fellow, San Diego State University
    • Topic: Recent Advances in Calculating the Thermal Noise in Conductors - Sampling the Grand Science

Slab-Coupled Optical Waveguide Devices and Their Applications, March 3, 2011

Talk by Dr. Paul W. Juodawlkis from the MIT Lincoln Laboratory.

Time: 10am-11am, March 3, 2011
Location: Booker Conference Room (Room 2512) in Jacobs Hall (formerly EBU1)

For students interested in a research intership/staff position at Dr. Juodawlkis' lab a recruitment meeting will be held:

Time: 3pm-4pm, March 3, 2011
Location: Room 6504 in Jacobs Hall (formerly EBU1)

UCSD-NICT Joint Symposium, March 2010

The chapter co-sponsored and helped to organize "UCSD-NICT" Joint Symposium on Innovative Lightwave, Millimeter-Wave and THz Technologies for Future Sustainable Network". We invited more than 10 speakers from Japan, 2 speakers from SSC Pacific, and 2 speakers from UCSD ECE faculty. We had more than 50 attendees at the symposium.

IEEE EDS & Photonics Society Joint Student Chapter Info Session, January 31, 2011

You are invited to an info session of UCSD IEEE EDS & Photonics Society Joint Student Chapter. 

Time: 12pm-1pm, Jan 31, 2011
Location: Booker Conference Room (Room 2512) in Jacobs Hall (formerly EBU1)
Lunch: Pizza and pop!
Ċ
Johana Y,
Mar 29, 2011, 9:47 PM
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Johana Y,
Mar 29, 2011, 9:48 PM
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UCSD IEEE Grad Chapter,
Mar 29, 2011, 9:46 PM
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UCSD IEEE Grad Chapter,
Mar 29, 2011, 9:46 PM
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Marco Antonio Escobar Acevedo,
Apr 23, 2012, 7:52 AM
Ċ
Johana Y,
Apr 3, 2011, 10:24 AM
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