Power Amplifier Techniques Workshop

Brought to you by The Radio Technology Group

Ever greater demands are being made on RF power amplifiers, in the quest for better radio channel capacity, by using higher order modulation schemes. At the same time, the move to mobile devices means battery life is paramount, driving amplifiers to achieve better efficiency.

Registration for this event is now closed.

About the event

This workshop will give a grounding in RF amplifier design as well as introducing techniques of interest to experienced engineers. It will start with an overview of RF power amplifier operation before covering the different strategies available to designers for trading-off the conflicting demands of linearity, efficiency and cost, addressing the needs of modern radio systems. The presentations will be supplemented by a practical demonstration of RF power amplifier measurement techniques.

You can follow @CambWireless on Twitter and tweet about this event using #CWRadioTech.

Sponsored by Rohde and Schwarz

Rohde & Schwarz is one of the world's leading manufacturers of information and communications technology products for professional users.

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The information supplied below may be subject to change before the event.


Registration and networking with refreshments


Introduction to Radio Technology SIG

Peter Topham, Qualcomm Technologies International


Welcome from sponsor, Rohde & Schwarz

Lindsay Harris, Sales Operations Manager, Rohde & Schwarz UK Ltd


An introduction to RF Power Amplifier Design - Chris Potter, CambridgeRF

Almost no two Power amplifiers are the same, many design decisions need to be made in choosing the correct device and circuit topology. This presentation introduces the considerations that need to be taken into account to meet the requirements of power, frequency, linearity, efficiency etc. Some of the key specs and corresponding measurements will be described.




High Efficiency Modes - Steve Cripps, University of Cardiff

This talk will focus on some more recent developments in PA modes, including Class J and so-called “continuous” modes, and the more controversial subject of switch modes and their relevance at GHz frequencies. The universally ignored effect of soft device IV characteristics will also be discussed.




Lunch and networking


Envelope Tracking - Gerard Wimpenny, Qualcomm Technologies International

This talk will introduce Envelope Tracking as a PA efficiency enhancement technique and will cover the advantages and challenges of ET compared with fixed supply, Average Power Tracking (APT) and Envelope Elimination and Restoration (EER) PAs. It will go on to consider 3 port ‘surface’ characterisation of ET PAs and the influence of the choice of envelope shaping function on PA efficiency and system linearity.




Digital Predistortion and Correction Techniques - Kevin Morris, University of Bristol

This talk will cover a number of digital correction techniques, including digital predistortion, adaptive distortion and Cartesian loop. These will be considered in terms of operating bandwidth, amount of improvement possible and effects of adjacent channel performance.




Refreshments and networking


Architectural Enhancements to Power Amplifiers & Transmitters - Gareth Lloyd, Rohde & Schwarz

The energy efficiency and signal integrity of an amplifier, or transmitter, may be significantly enhanced by implementing architectural concepts. Historically, much research effort has been dedicated to such techniques. This presentation provides a quick hierarchical overview of the concepts, before discussing and demonstrating variants of one of the most popular classifications.




Event Close


Steve Cripps - Distinguished Research Professor, University of Cardiff

Prof. Cripps graduated from Cambridge University, England, with a Masters and Ph.D. in the mid 1970’s, and then spent many years working in the microwave electronics industry, both in the UK and California. This included spells as designer, manager, company founder (Celeritek), and independent consultant. He has written several books on RF Power Amplifiers and was the recipient of both 2008 IEEE Microwave Applications Award and the 2015 Microwave Prize for his work in RFPA design. Prof. Cripps is currently a Distinguished Research Professor at Cardiff University, Wales, UK and a Life Fellow of the IEEE.

Gareth Lloyd - Individual Contributor, Rohde and Schwarz

Gareth Lloyd graduated from the University of Leeds in 1994 with a degree in Electronic & Electrical Engineering. Gareth has worked in various engineering and management roles, in different industries, for major companies including Ericsson, Huawei, ZTE, TriQuint and Andrew Corporation. Gareth joined Rohde & Schwarz in 2015, as a Individual Contributor. His primary work focus is performance differentiated radio front-ends (RFFE). With R&S, he is the primary named on nine granted Patents and a further five Patent Applications.

Kevin Morris - Professor of Radio Frequency Engineering, University of Leeds, Head of School, University of Leeds - School of Electronic & Electrical Engineering

Kevin Morris received the B.Eng. and Ph.D. degrees in electronics and communications engineering from the University of Bristol, Bristol, U.K., in 1995 and 2000, respectively. He is currently a Professor of Radio Frequency engineering and Head of the School of Electronic and Electrical Engineering at the University of Leeds. He has authored or co-authored over 130 academic papers, and he holds five patents. His research principally concerns looking at methods of reducing power consumption in communications systems with specific interest in the design of efficient frequency flexible transceivers. He is currently involved with several industrial and Engineering and Physical Sciences Research Council (EPSRC) research projects. He was the Head of the Department of Electrical and Electronic Engineering at the University of Bristol from 2014 to 2018.

Chris Potter - Director, Cambridge RF Ltd

Chris Potter is presently a consultant and director with Cambridge RF Ltd. in Cambridge UK, working on circuit-level design and product integration and approvals. Diverse projects for clients include the fields of GPS receivers, Bluetooth testers, Envelope Tracking PAs, Security tag readers, Zigbee consumer products, Microwave radios, and DVB over fibre. Previously, he was Principal Engineer at Marconi Instruments, where he designed a variety of microwave and RF test equipment including signal generators and network analyzers. Later he held the post of Chief RF Technologist at Tality UK (formerly Symbionics), working on RF architectures and product designs for GSM, EDGE, Bluetooth, 802.11a/b and W-CDMA. His research interests include adaptive linearization of PAs. He also runs Aphena Ltd, a software company that produces tools for RF engineers to help with measurement automation during the design process. Chris Potter received his Ph.D. degree on the subject of Microwave Network Analysers in 1987 from the University of London, England.

Gerard Wimpenny - Senior Director of Technology, Qualcomm Technologies International

Gerard Wimpenny graduated from Cambridge University in 1983 with a degree in Electrical Sciences. He worked on a wide variety of RF and PAs developments at BBC R&D and subsequently as Technical Director at Symbionics/Tality. He joined Cambridge startup Nujira as CTO in 2004 and worked on Envelope Tracking modulators with output powers spanning 1W to >1000W. Nujira was acquired by Qualcomm in 2015 and Gerard now works at Qualcomm UK as a Senior Director of Technology focusing on Envelope Tracking.

SIG Champions

Mark Beach - Professor of Radio Systems Engineering, University of Bristol (Communication Systems & Networks Research Group)

Mark Beach received his PhD for research addressing the application of Smart Antenna techniques to GPS from the University of Bristol in 1989, where he subsequently joined as a member of academic staff. He was promoted to Senior Lecturer in 1996, Reader in 1998 and Professor in 2003. He was Head of the Department of Electrical & Electronic Engineering from 2006 to 2010, then spearheaded Bristol’s hosting of the EPSRC Centre for Doctoral Training (CDT) in Communications. He is the Co-Director of this centre. He leads research in the field of enabling technologies for the delivery of 5G and beyond wireless connectivity; which includes the recent award of an EPSRC Prosperity Partnership in the field of Secure Wireless Agile Networks (SWAN). Mark’s current research activities are delivered through the Communication Systems and Networks Group, forming a key component within Bristol’s Smart Internet Lab. He has over 30 years of physical layer wireless research embracing the application of Spread Spectrum technology for cellular systems, adaptive or smart antenna for capacity and range extension in wireless networks, MIMO aided connectivity for through-put enhancement, experimental evaluation and optimization of Massive MIMO, Millimetre Wave technologies as well as flexible RF technologies for SDR modems. With a strong industrially focused research portfolio, he is also the School Research Impact Director.

Brian Collins - Managing Consultant, BSC Associates

Brian has designed antennas for applications including radio and TV broadcasting, base stations, handsets and consumer products, and has operated his own consultancy firm for the last 12 years. He has published more than 70 papers on antenna topics and contributed chapters to several recent textbooks. He operates a small consultancy company, chairs the Antenna Interface Standards Group and is an Honorary Visiting Professor in the School of Electronic Engineering and Computer Science at Queen Mary, University of London.

Paul Harris - Principal Wireless Architect, VIAVI Solutions

Paul is a wireless technology expert with experience across a range of areas including research, design, implementation and standardisation. He received his PhD from the University of Bristol for evaluating the performance of massive MIMO technology in the lead-up to 5G and is currently a Principal Wireless Architect within the CTO Office at VIAVI Solutions providing thought leadership on new and emerging technologies for 5G, 6G and beyond. In line with this he represents VIAVI within a range of bodies and fora including 3GPP, the O-RAN Alliance, ETSI, the Next G Alliance, the 6G-IA and the UKTIN. His experience prior to joining VIAVI includes representing Vodafone within 3GPP for radio performance aspects, contributing to the development of massive MIMO channel estimation solutions at Cohere Technologies, and working with customers as a domain expert at National Instruments to establish effective research solutions using software-defined radio. He is also a Chartered Engineer, Senior Member of the IEEE, Fellow of the ITP, and an Honorary Industrial Fellow at the University of Bristol.

Peter Kibutu - 5G NTN Market lead, TTP plc

Peter has been working in the cellular industry for over 15 years, specialising in modem system architecture and physical layer development. Before joining TTP, Peter worked in the development of 2G/3G/4G wireless modem products and small-cell base station projects for a number of leading cellular equipment vendors. At TTP Peter has worked with a wide range of clients in the satellite and cellular communication domains, specialising in end-to-end system engineering, modem system development and advising on commercial aspects. Currently Peter is the TTP technical lead for 5G/6G activities and represents the company in range of industry bodies including 3GPP and UKTIN.

Peter Topham - Principal Engineer, Qualcomm Technologies International

Peter has more than 30 years experience of RF and high-speed circuit design, taking chips into production ranging from FM Band II through cellular, Bluetooth and on to UWB at 10GHz. He has been with Qualcomm for 7 years, specialising in low-power RF design for portable and wearable products.

Event Location

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Location info

Jesus College, University of Cambridge, Jesus Lane, Cambridge CB5 8BL

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