Advanced RF Power Amplifier Techniques for Modern Wireless and Microwave Systems
September 25 - 29, 2017
. Amersfoort, The Netherlands
We recommend you to submit your
preliminary or firm registration at least 4 weeks before course
start to ensure a seat on the course.
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In any system, the power amplifier (PA) is a critical component.
It is typically the most costly single item and consumes most of
the supply power. Knowledge of the possibilities for trading power
per unit cost with efficiency and linearity often forms the basis
for the entire system architecture design.
The increasing use of linearisation techniques, and especially the
emergence of high speed digital processing as an enabling
technology to implement predistortion on the PA input signal,
represent an important paradigm shift in PA design. The PA
component can now be designed with more emphasis on efficiency,
without the traditional constraints of meeting stringent linearity
specs simultaneously. Maximising the utility of a lineariser in
order to obtain optimum efficiency has thus become a new subject
area in modern RF PA design.
This is a newly revised and updated 5-day RF PA design course,
dealing with the theory and design of RF power amplifiers for
wireless, satcom, and microwave applications. The course features
in-depth treatment of PA design, PA modes, envelope power
management, and non-linear effects.
WHO SHOULD ATTEND
This course presents an overview, fundamentals, theory, practical
and advanced power amplifier design which will be of interest to
engineers and technical staff, managers and business development
personnel who plan to pursue this technology, or compete with
BENEFITS OF THIS COURSE
Enhance your understanding of:
- Power amplifier basic concepts, classes of operation,
stability, linearity, bias technique
- Impedance matching techniques based on lumped elements and
- High-efficiency techniques including well-know Classes F and E
and newly developed classes, Efficiency Enhancement Techniques
- Power Amplifier Non-Linearities and Signal Environments
- PA Architecture
Power Amplifier Basics and Signal Environments
Linear amplifier modes are described with quantitative analysis of
power, efficiency and linearity tradeoffs in uncompensated form
leading into a discussion of the device technologies currently
available for PA design, including LDMOS, GaAs MESFET and HBT, SiC
and GaN. Differences between bipolar and FET devices, and the
effects of different kinds of parasitic effects will be discussed
using circuit analysis and CAD models. Possibilities for tailoring
the characteristics of devices for optimum efficiency and linearity
will be presented. Particular emphasis is given to correct
fundamental and harmonic matching. The impact of non-ideal harmonic
terminations in practical Class AB designs will be analysed
quantitatively. Various modulation systems (QPSK, EDGE, CDMA, OFDM)
will be reviewed from the viewpoint of PA requirements.
• Classical PA Modes, Class A, Class AB, Class
B, Class C
• PA Device Technology
• Optimum Device Characteristics for Class AB
• Modulation Systems in Wireless Communications
QPSK, GSM, EDGE, OFDM
• Effect of Signal Environment on RFPA
Class AB PA Design
We will focus on practical issues in the design and manufacture of
PAs for RF and MW Systems. Several design examples will be
demonstrated, including a GaAs MESFET, a GaAs HBT, and a high power
• Class AB circuits
• Harmonic Terminations
• CAD Design Examples
Power Amplifier Non-Linearity and Signal Environments
We will focus on the non-linear properties of RF PAs, their
source, manifestation, and methods for their characterization and
modeling. A topical issue of great impact in modern linearised
multi-carrier PA (MCPA) applications is memory effects.This subject
will be illustrated with device measurements, and physical causes
and remedies will be discussed.
There will be a full treatment of bias network design.The
process of converting a measured PA gain compression and AM-PM
characteristic into spectral and EVM distortion, and the issues
involved, will be discussed using several different modulation
environments, including GSM-EDGE and WCDMA.
• Non-Linear PA Characteristics, Gain
• Physical Origins of AM-PM, Analysis
• Peak to Average Power Ratio Issues in Modern
• Spectral Regrowth and EVM
• Power Series, Volterra Series. Model Fitting
using Measured Data
• Envelope Simulation using EDGE, OFDM
• Memory Effects, Definition, Dynamic Gain/Phase
Measurements, Causes and Remedies
• Bias Network Design and Stability
Efficiency Enhancement Techniques
We will focus on the key issue of power back-off (PBO) efficiency,
and LINC (linear amplification using non-linear components).
Envelope management methods and tracking techniques in PA design
will be presented. These include classical techniques such as the
Chireix out-phasing method, the Khan and the Polar Loop envelope
reconstruction approaches and the Doherty PA. Other less well-known
techniques will be discussed, with emphasis on the broader band
requirements, which future WiMax systems will require. Ultra high
efficiency amplifier modes, Classes C, D, E, and F will be analyzed
as possible candidates for LINC implementation and as stand-alone
possibilities in systems using digital pre-distortion or feed
Finally, PA architecture, including multistage effects, power
combining techniques, and load pull design will be discussed.
Step-by-step examples of two MMIC PA designs, one with modest, and
a further example with wideband operation will be given - this will
include technology evaluation to packaging considerations.
• Power Combining Techniques
• Balanced and Push-Pull Operation
• Load-Pull Techniques
• Microwave PA Design - including step-by-step MMIC PA design
An introduction to mm-wave components and applications
mm-wave circuits are becoming more commonplace as
semiconductor technologies mature which provide performance up to
100 GHz and beyond.
This Session will offer an introduction to the technologies and
components operating at mm-wave and some of the key applications.
Amplifier design at mm-wave will be discussed with a design
example. Differences in the approach of amplifier design at
mm-wave compared to lower frequency will be highlighted. In
addition, an introduction will be given for other common component
types at mm-wave: mixers, multipliers, oscillators and mixed
(analogue/digital) signal techniques. Packaging, interconnection
and combining will also be considered.
Finally, the emerging field of sub-mm-wave (Terahertz) components
will be introduced.
• Applications in mm-wave
• mm-wave technologies
• Amplifiers - including a design example
• Common mm-wave components
• Packaging at mm-wave
Dr Cripps has written a book, that he would like to recommend,
however, the book is not compulsory for the course.
Title: RF Power Amplifiers for Wireless Communications, Second
Dr Cripps has also written
"Advanced Techniques in RF Power Amplifier Design", 2002.
Students may order the books over the Artech House website,
http://www.artechhouse.com and receive a 15% discount by entering
the promotion code "CEI" in the online order form.
Said about the course from previous
"Very practical view of subjects, gives good input for
"A good trade-off between theory and practice, good basis for new
"Concentration on insight, fundamentals, rules of thumb, practical
"Topics presented in a logical order. Dr Cripps brought out
valuable personal observations upon several topics."
"Lecture material and notes backed up with appropriate and
relevant demonstrations. Broad spectrum of information
"Good overview about state-of-the-art techniques. Good input for
"Good curriculum, nice sense of humor of the Professor."