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Buy "X-parameters" and Bring an End to the Confusion!
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Cambridge University Press recently
published
"X-Parameters"*, authored by David Root, Jan
Verspecht, Jason Horn and Mihai Marcu. This book brings an
end to more than a decade of confusion and misunderstandings
concerning this technology. In the past information was scattered
amongst many different scientific papers that were published
across a timespan of 17 years! Ever changing naming conventions
and mathematical notations made it hard to learn, understand
and use the technology. This book presents a complete, actual
and coherent publication on the subject, a must read for RF
& microwave engineers! |
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SWAP-X402's demonstrated by VTD and Mesuro at
the 2011 European Microwave Week in Manchester!
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Our spin-off company Verspecht-Teyssier-DeGroote
(VTD) presented state-of-the-art pulsed time
domain load pull measurements with the SWAP-X402. The SWAP-X402
is the world’s fastest NVNA receiver, performing real time
measurements at a rate of 10 dynamic load lines per second,
even in pulsed mode! The company Mesuro demonstrated their
loadpull setup using a second SWAP-X402. Read all about VTD
and Mesuro's latest SWAP-X402 application in the EuMW
edition of Microwave Journal. |
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SWAP-X402, World's Fastest NVNA, successfully
demonstrated at the IMS 2011 in Baltimore!
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Jan Verspecht was present at
the International Microwave Symposium in Baltimore. Our spin-off
company Verspecht-Teyssier-DeGroote (VTD)
succesfully demonstrated the SWAP-X402, world's
fastest and most affordable NVNA.
The exhibition offered a great opportunity to meet existing
as well as future customers as VTD's booth got a lot of interested
visitors. But excitement was not limited to the conference
center. On the left you see the baseball Jan Verspecht caught
during the Monday ballgame, right off the bat of Derrek Lee!
Baltimore, definitely our favorite IMS conference location!
|
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Latest results on X-parameters* and Long Term
Memory presented at the 76th ARFTG Conference
|
Jan Verspecht presented the latest
results on Dynamic X-parameters* at the Memory workshop of
the 76th ARFTG Microwave Measurement Conference (December
3rd 2010, Clearwater Beach, FL, USA). The
slides of all workshop presentations are available on
line (courtesy of ARFTG). As shown in the presentation dynamic
X-parameters can accurately describe long term memory effects
like IM3 sweet spots, hysteresis in AM-AM and AM-PM, asymmetric
spectral regrowth,... Dynamic X-parameters* can accurately
model nonlinear amplifier behavior under narrowband as well
as wideband modulated excitation. |
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Jan Verspecht and co-authors win Best Oral Presentation
Award at Spring 2010 ARFTG
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We are proud to announce that
the attendees of the Spring 2010 ARFTG Conference have choosen
our contribution as the Best Oral Presentation (there was
a tie with a paper by Yves Rolain et al. of the Vrije Universiteit
Brussels). Our award winning presentation is entitled "A
Simplified Extension of X-parameters* to Describe Memory Effects
for Wideband Modulated Signals". Co-authors are Jason
Horn and David Root of Agilent Technologies.
We are honored by winning this award and we
hereby thank all attendees who gave a positive evaluation
as well as the management of Agilent Technologies and the
PANAMA consortium for their continued support.
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IMS 2010 - Anaheim
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Jan Verspecht was present at the
2010 International Microwave Symposium in Anaheim. He presented
the latest results on X-parameters* and memory effects at the
ARFTG conference. The paper is entitled "A
Simplified Extension of X-parameters* to Describe Memory Effects
for Wideband Modulated Signals". Co-authors are Jason
Horn and David Root of Agilent Technologies. The new technique
deals with X-parameters* with memory in the case of wideband
modulation with stationary statistics.
Jan Verspecht was also present at the exhibition booth of
the company Verspecht-Teyssier-DeGroote
(VTD). VTD demonstrated the fastest and most affordable receiver
for time domain loadpull applications: the SWAP-X402. |
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Our technology on the cover of Microwave Journal
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X-parameters* and other technology
pioneered by Jan Verspecht are featured on the cover of the
March 2010 issue of Microwave Journal. The cover feature
article, authored by Microwave Journal editor David Vye, reveals
the history of modern nonlinear microwave measurement techniques
and gives an excellent overview of the many commercial solutions
and enterprises that are in existence today. As a seasoned
entrepeneur and a recognized pioneer in this high-tech field,
Jan Verspecht considers it an honor to have helped the author
by providing information on this highly complex subject. A
must read for all microwave engineers! |
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IMS 2009 Best Oral Paper Presentation Award
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Out of 114 presentations, our
contribution "Extension
of X-parameters* to Include Long-Term Dynamic Memory Effects",
presented at the 2009 International Microwave Symposium, has
been selected by the attendees as the Best Oral Paper Presentation
of the Day, for Wednesday, 10 June 2009. Co-authors are Jason
Horn, Loren Betts, Chad Gillease and David Root of Agilent
Technologies, Roger Pollard of the University of Leeds and
Daniel Gunyan. We are honored by winning this award and we
hereby thank all attendees who gave a positive evaluation
as well as the management of Agilent Technologies and the
PANAMA consortium for their continued support. |
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Highlights of 2009: X-parameters* with memory and the SWAP-X402
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A powerful new method was developed
to include memory effects with X-parameters*. The measurements
are based on accurately measuring large signal step responses
and were performed using Agilent PNA-X hardware and dedicated
software. Early results of this on going R&D work sponsored
by Agilent Technologies were presented at the IMS 2009: "Extension
of X-parameters* to Include Long-Term Dynamic Memory Effects".
Co-authors are Jason Horn, Loren Betts, Daniel Gunyan, Chad
Gillease and David Root of Agilent Technologies and Roger
Pollard of the University of Leeds. |
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The first SWAP-X402's have been
delivered to the early adaptors of this revolutionary technology
(SWAP-X402
product brief). The SWAP-X402 is a product of Verspecht-Teyssier-DeGroote
SAS, a spin-off from Jan Verspecht BVBA and the XLIM research
institute. The instrument provides a simple and affordable
way to add time domain loadpull capability to virtually any
loadpull setup. A 20GHz SWAP-X402 is available for
80.000 euros. |
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IMS 2009 - Boston
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Jan Verspecht was present at the
International Microwave Symposium 2009 in Boston (June 7-12).
He presented the paper "Extension of X-parameters* to Include
Long-Term Dynamic Memory Effects". Co-authors are Jason Horn, Loren
Betts, Daniel Gunyan, Chad Gillease and David Root of Agilent
Technologies and Roger Pollard of the University of Leeds.
Jan also co-authored the paper "Bursts of Pulses for Time Domain
Large Signal Measurements". This paper was presented during
the ARFTG conference by Jad Faraj of XLIM. First
author is Jad Faraj, other co-authors are Raymond Quéré and
Jean-Pierre Teyssier of XLIM and Fabien De Groote of Verspecht-Teyssier-DeGroote s.a.s.
|
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X-parameters* proclaimed Product of the Year
2008
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We are proud to announce that
the editors of Electronic Products have chosen the X-parameters*
as a winner of the Product of the Year 2008 Award (link
to Electronic Products). Dr. Jan Verspecht is the inventor
of the X-parameters*, a product of Agilent Technologies that
resulted from a highly successful collaboration with Jan Verspecht
b.v.b.a.. |
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European Microwave Week 2008
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The European Microwave Week 2008
took place in Amsterdam, the beautiful city of canals, also
famous for its thriving coffee, mushroom and bikini business.
On Monday October 27th Jan presented the paper "X-parameter
Measurement and Simulation of a GSM Handset Amplifier"
(other authors are Jason Horn, Daniel Guyan, Loren Betts
and David Root from Agilent Technologies and Joakim Eriksson
from Sony-Ericsson Mobile Communications) This presentation
was part of the EuMIC 2008. Jan also co-authored the paper
"Pulse
Profiling for AlGaN/GaN HEMTs Large Signal Characterizations".
This paper was presented by rookie Jad Faraj of XLIM during
the special NVNA Users' Forum Session on Thursday. Co-authors
of this paper are Fabien De Groote and Jean-Pierre Teyssier
from Verspecht-Teyssier-DeGroote s.a.s., Raymond Quéré from
XLIM and R. Aubry from Alcatel-Thales III- Lab.
|
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Discover the genesis of X-parameters*
|
Get a better understanding of
X-parameters* by discovering their genesis. The very first
paper on the concept is entitled "Black Box Modelling
of Power Transistors in the Frequency Domain" (download
pdf). The paper was authored by Jan Verspecht, at that
time working as a research engineer for HP, and was presented
during the 4th International Workshop on Integrated Nonlinear
Microwave and Millimeterwave Circuits in October 1996 (Duisburg,
Germany). This milestone paper introduced the concept of a
measurement setup based on tickler tones and a "nonlinear
network analyzer" (now called the NVNA option for the
PNA-X of Agilent Technologies), the linearization coefficients of the multi-harmonic
spectral mapping operators (now called the X-parameters*) and
the link with harmonic balance simulators (now available in
Agilent ADS). Note that many other interesting vintage
papers by Jan Verspecht can be downloaded from this web-site.
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IMS 2008
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Jan Verspecht attended the International
Microwave Symposium 2008 in Atlanta (June 17-20). He presented
"Poly-Harmonic Distortion Measurements: A Maturing Amplifier
Measurement Technology" during the full day workshop
"Measurements for Wireless System-Level Evaluation"
(WSH) on Sunday. Jan also co-authored the paper "High-Power
On-Wafer Capabilities of a Time Domain Load-pull Setup" (download
pdf). The paper was presented by Fabien De Groote during
the ARFTG Interactive Forum. Co-authors are F. De Groote (Verspecht-Teyssier-DeGroote
s.a.s.), J-P Teyssier and J. Faraj (Xlim). |
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Get introduced to Power Transistor Characterization!
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Our paper entitled "Introduction to Measurements for Power Transistor Characterization" (download pdf) was published in the June 2008 issue of the IEEE Microwave Magazine.
Authors are Fabien De Groote (Verspecht-Teyssier-DeGroote s.a.s.), Jean-Pierre Teyssier (XLIM), Tony Gasseling (Amcad Engineering), Olivier Jardel (XLIM) and Jan Verspecht. The paper introduces the concepts of pulsed IV measurements, pulsed S-parameter measurements and time domain loadpull techniques.
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Time domain loadpull of GaN and GaAs transistors presented at ESA workshop
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On May 7th 2008 Jan Verspecht presented the paper "Advanced Time Domain Loadpull Technique for Characterization of Microwave Power Transistors" (download pdf)
at the ESA Microwave Technology and Techniques Workshop 2008 (Noordwijk, The Netherlands). Co-authors are Fabien De Groote (Verspecht-Teyssier-DeGroote s.a.s., Brive, France) and Jean-Pierre Teyssier (Xlim, Brive, France).
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IEEE Fellowships Awarded to Jose Carlos Pedro,
John Wood and Jan Verspecht
Picture courtesy of Gayle Collins |
In 2007 the Board of Directors
of the IEEE awarded the prestigious grade of IEEE Fellow to
16 members of the MTT. They were recognized in Honolulu during
the well attended plenary session of the IMS 2007. On the
picture we recognize 3 new Fellows: Jose Carlos Pedro of the
Universidad de Aveiro, (Aveiro, Portugal), John Wood of Freescale
(Tempe, Arizona, USA) and Jan Verspecht (Opwijk, Belgium),
all of them experts in the field of nonlinear microwave measurements
and modelling. At Jan Verspecht b.v.b.a. we want to congratulate
the new Fellows. We also want to express our gratitude to
all of the people who supported Jan Verspecht during his challenging
career as an independent consultant and as such contributed
to his IEEE Fellowship.
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Aloha!
|
Jan Verspecht was in Hawai`i
for the International Microwave Symposium 2007. He presented
the paper "Multitone, Multiport, and Dynamic Memory Enhancements
to PHD Nonlinear Behavioral Models from Large-Signal Measurements
and Simulations" (download
pdf). This paper is co-authored by Daniel Gunyan, Jason
Horn, Jianjun Xu, Alex Cognata and David Root of Agilent Technologies.
Jan co-authored the paper "On-Wafer Time Domain Load-Pull
Optimization of Transistor Load Cycle with the New Multi-Harmonic
MPT Tuner" (download
pdf), presented as a poster paper at the ARFTG Conference
on Friday June 8th. Other authors are Fabien De Groote, Olivier
Jardel, Jean-Pierre Teyssier of XLIM (France), Tony Gasseling
of AMCAD Engineering (France), Vince Mallette and Christos
Tsironis of Focus Microwaves (Canada). |
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Presenting our affordable LSNA technology at
the Power Amplifier Symposium
|
Jan Verspecht presented two
papers at the Power Amplifier Symposium in Long Beach, CA,
from Sunday January 7th until Tuesday January 9th. On Sunday
Jan presented a talk on "Affordable Large-Signal Network Analyzer
Technology" during the workshop "WS2: RF Power Transistors
and Amplifier Characterization Techniques", organized by John
Wood and Basim Noori (Freescale, Tempe, USA). During the plenary
session on Monday morning Jan presented an invited paper entitled
"Advanced Measurements for Power Transistors" (download
pdf). Both presentations are co-authored by Jean-Pierre
Teyssier and Fabien De Groote (XLIM, France) and introduce
our affordable LSNA technology.
|
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Meeting Metrologists at the Fall 2006 ARFTG
Conference
|
During the last week of November
2006 Jan Verspecht attended the 68th ARFTG conference in Broomfield
(Colorado, USA). He co-authored a paper entitled "Load-pull
measurement of transistor negative input impedance" (download
pdf). The first author of the paper is Fabien De Groote,
other co-authors are Jean-Pierre Teyssier and Raymond Quere
of XLIM (formerly IRCOM, France). Friday afternoon all members
of ARFTG were invited for a fascinating visit to the laboratories
of the National Institute of Standards and Technologies (NIST)
in Boulder. During the visit we had the honor of seeing the
world's one and only traceable harmonic phase standard. This
setup was built by Dr. Dylan Williams and is based on a photo-electric
sampler. A special thanks from Jan Verspecht goes to Dylan
Williams and Kate Remley for hosting me in their wonderful
historical house, known as the Arnett-Fullen house (see picture).
|
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Our PHD Model Made the Cover of the June 2006
Issue of the IEEE Microwave Magazine!
|
We proudly announce the publication
of our paper on Polyharmonic Distortion Modeling as the features
article in the June 2006 issue of the IEEE Microwave Magazine
(download
pdf). The article is authored by Jan Verspecht and David
Root. The paper introduces you to the Polyharmonic Distortion
Modeling technique. This so-called PHD modeling technique
is a powerful black-box frequency domain behavioral modeling
technique, based on the theory of the scattering functions.
It is explained in the paper how nonlinear behavior may cause
unhappiness. This fact is illustrated by (:-) faces that get
squeezed (:-( by the conjugate a21-terms, which are only present
in the case of nonlinear behavior.
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We have been to San Francisco
|
Jan Verspecht was in San Francisco
for the International Microwave Symposium 2006. Jan co-authored
two presentations. The first was entitled "Nonlinear
Behavioural Models with Memory: Formulation, Identification
and Implementation". Authors are David Root (Agilent
Technologies), Jan Verspecht and David Sharrit. It was presented
in the workshop "WSL: Memory Effects in Power Amplifiers".
The second paper was entitled "Accurate Phase Measurements
of Broadband Multitone Signals using a Specific Configuration
of a Large Signal Network Analyzer". Authors are M. El
Yaagoubi, G. Neveux, D. Barataud, J. Nebus (University of
Limoges XLIM) and Jan Verspecht (download
pdf). We thank rookies Hind Bousbia of Xlim and Floria
Blanchet of STMicroelectronics for providing the undistorted
(:-) faces on the picture.
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Don't miss the December 2005 issue of the IEEE
Microwave Magazine!
|
We proudly announce the publication
of our paper on Large-Signal Network Analysis as a features
article in the December 2005 issue of the IEEE Microwave Magazine
(download
pdf). The paper introduces you to the world of Large-Signal
Network Analysis (LSNA) and invites you to join the rapidly
growing LSNA community.
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The 66th ARFTG conference: definitively a three-pointer!
|
December 1st and 2nd Jan Verspecht attended
the 66th ARFTG conference in Washington DC. There were many
interesting presentations on a wide variety of topics, from
nanotubes to 500 GHz network analyzers. Mohamed Sayed, technical
program chair, and Greg Burns, general chair, did a great
job and definitely scored a three-pointer. Jan Verspecht presented
the paper "Hot S-Parameter Techniques: 6=4+2" (download
pdf). Read the paper and find out what is missing with
the Hot S-parameter techniques of Agilent, Anritsu and Rohde
& Schwarz. Fabien De Groote of IRCOM did an excellent
job in presenting the paper "Time Domain Harmonic Load-Pull
of an AlGaN/GaN HEMT" (download
pdf). Co-authors are Olivier Jardel, Denis Barataud, Jean-Pierre
Teyssier and Raymond Quere of IRCOM and Jan Verspecht. Friday
evening was NBA time: the picture on the left shows a Milwaukee
Buck taking a shot at the Washington Wizards basket.
|
Courtesy Fabien De Groote |
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New IEEE Transactions Paper on PHD Models Published
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A new extensive paper on the Poly-Harmonic
Distortion (PHD) black-box frequency domain modelling technique
has been published in the November 2005 issue of the IEEE
Transactions on Microwave Theory and Techniques (download
pdf). Authors are David Root, David Sharrit and Alex Cognata
of Agilent Technologies, John Wood of Freescale and Jan Verspecht.
The paper is entitled "Broad-Band Poly-Harmonic Distortion
(PHD) Behavioral Models From Fast Automated Simulations and
Large-Signal Vectorial Network Measurements". Next to
the theory of the PHD model, it is explained how the PHD model
can be extracted based on nonlinear vector network analyzer
(NVNA) measurements or harmonic balance simulations using
Agilent ADS. |
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The International Microwave Symposium 2005:
A Vibrant Experience
|
On the left David Root and Jan Verspecht prepare for presenting
their joint paper "Broad-Band, Multi-Harmonic Frequency
Domain Behavioral Models from Automated Large-Signal Vectorial
Network Measurements" (download
pdf). The paper was presented at the MTT-S poster session
on Thursday June 16th. Other authors are Alex Cognata of Agilent
Technologies and John Wood, now with Freescale. During the
poster session a small earth quake took place, a vibrant experience.
A second IMS paper was also co-authored by Jan Verspecht.
The title is "An improved coupling method for time domain
load-pull measurements". The work was brilliantly presented
by rookie Fabien De Groote at the ARFTG conference on Friday
June 17th (download
pdf). Other authors are Jean-Pierre Teyssier of IRCOM
(France) and Christos Tsironis of Focus Microwaves (Canada).
|
Picture courtesy of Daniel Gunyan, Agilent
Technologies. |
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The book of Wood and Root: your number 1 survival
guide
|
Artech House recently published the book
"Fundamentals of Nonlinear Behavioral Modeling for RF
and Microwave Design" (link
to Artech House). The book was edited by Dr. John Wood
and Dr. David Root. The book is a revised collection of groundbreaking
presentations that were made at a successful workshop during
the 2003 International Microwave Symposium. The book gives
an excellent overview of existing methods and is a great starting
point on any large-signal microwave modelling journey. It
is authored by no less then 10 renowned experts in the field
of nonlinear behavioral modeling for RF and microwave: Nuno
Borges Carvalho, Edouard Ngoya, Jose Carlos Pedro, David E.
Root, Arnaud Soury, Nick Tufillaro, Jan Verspecht, John Wood,
Jianjun Xu and Qi-jun Zhang. |
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Fresh of the Press: Circles of the Olympic Games
Logo Start Rolling!
|
Fortunately for the athletes the press has
it wrong: the coloured rings on the left have nothing to do
with the next Olympics. The meaning of the rotating coloured
rings is explained in detail in a new paper entitled "Linearization
of Large-Signal Scattering Functions" (download
pdf). The paper is the result of a fruitful collaboration
between the National Institute of Standards and Technology
(NIST), the Catholic University of Leuven (Belgium) and "Jan
Verspecht bvba". The paper has been published in the
April 2005 issue of the IEEE Transactions on Microwave Theory
and Techniques. Authors are Jan Verspecht, Dylan F. Williams
(NIST), Dominique Schreurs (Catholic University of Leuven),
Kate A. Remley (NIST) and Michael D. McKinley (NIST).
|
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Tutorial on Large-Signal Network Analysis
Jan Verspecht presented the tutorial "Large-Signal
Network Analysis - 'Going beyond S-parameters'" (download
pdf) during the 64th ARFTG Conference on "Digital Communication
System Metrics". The conference took place from November 30
to December 3, 2004 in Orlando, Florida, USA. The tutorial was presented
on Wednessday December 1st as part of the ARFTG Short Course program.
More information on ARFTG is available on the ARFTG web-site (www.arftg.org).
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Tribute to Bill and Dave
During one of his business trips Jan Verspecht visits
the famous garage where Bill Hewlett and Dave Packard started their
business in the late 30's. Considered as the "birthplace of
Silicon valley" the garage is recognized as a monument by the
State of California. A truly inspiring moment!
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Meeting cowboys in Fort Worth, Texas (:-)
The International Microwave Symposium 2004 took place
from June 6th until June 11th in Fort Worth, Texas. This offered
a unique opportunity to meet with all kinds of cowboys. At the left
Jan Verspecht meets with French cowboy Jean-Pierre Teyssier, just
before the NVNA user forum. At the right he meets with an American
cowboy at the rodeo arena. Despite their quite different looks,
it was discovered that both cowboys have a lot in common. Both wear
the same kind of hat and both of them are used to deal with highly
nonlinear problems (power transistors for the French cowboy and
raging bulls for the American cowboy) (:-).
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WME workshop at IMS 2004 was a hit!
On June 7th 2004 Mr. Ruediger Follman of IMST and
Jan Verspecht co-organized the fullday workshop "More efficient
Circuit Design by Means of Large-Signal Models and Large-Signal
Measurements". This workshop was part of the International Microwave
Symposium 2004 in Fort Worth, Texas. The workshop was a real succes
having about 80 attendees. As an unfortunate consequence we run
out of workshop notes. I apologize to all the people who did not
get their notes. A pdf-file of the workshop notes extended with
additional and very informative comments for most of the speakers
can be downloaded by clicking the button below.
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Multidimensional interpolation and curve fitting
with scattered input data in Mathematica
Multidimensional interpolation and curve fitting
based on scattered input data is now possible in Mathematica thanks
to the JanVerspechtMultiDim Mathematica package. This package implements
multidimensional interpolation and curve fitting functions which
can handle scattered input data. Adding this package to your copy
of Mathematica you are no longer constrained to "regular grid" input
data, as it is the case with the standard Mathematica Interpolation
function. You can download your fully functional free trial version
on our products page.
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It was a great 62nd ARFTG Conference!
We attended the
ARFTG Microwave Measurement Conference. The conference and the
associated tutorial sessions took place from Tuesday December 2
until Friday December 5 2003 in Boulder, Colorado, USA. Jan presented
the tutorial "Large-Signal Network Analysis - 'Going beyond S-parameters'"
(download
pdf) during the ARFTG Short Course session on Wednessday December
3. Jan also made a presentation entitled 'The Return of the Sampling
Frequency Convertor' (download
pdf).
This 62nd edition of the ARFTG was definitely one
of the best editions in many years. Many topics were covered in
high quality presentations. A special thanks from Jan Verspecht
goes to his hosts Chair Dylan Williams and Technical Program Chair
Kate Remley (see picture) for organizing a truly commemorable event!
Picture courtesy of Dr. Marc Vanden Bossche, NMDG Engineering, Belgium.
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It was a pleasure to meet at the International
Microwave Symposium - 2003
Jan Verspecht attended the International Microwave
Symposium (IMS) 2003 in Philadelphia. He made a presentation entitled
"Scattering Functions for Nonlinear Behavioral Modeling in the Frequency
Domain" (click for pdf)
in the workshop "Fundamentals of Nonlinear Behavioral Modeling:
Foundations and Applications", organised by Dr. David Root and Dr.
John Wood of Agilent Technologies. The symposium visit was a big
hit. We were able to meet many old friends and colleagues and made
many new acquintances.
Too bad the Phillies baseball game on Saturday was cancelled because
of the rain! But we did get a chance to see the Liberty bell. I
really like the picture below: the symbol of Liberty together with
Jan Verspecht, who in his own way proclaimed liberty by founding
"Jan Verspecht bvba". Great!
Picture courtesy of Dr. Dominique Schreurs, Catholic University
of Leuven, Belgium.
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Good news (:-)
"Jan Verspecht bvba" is up and running. We move fast
forward with confidence. The mission is simple: to assist the many
people who are developing the RF and microwave tools of the future.
For Jan Verspecht it is like continuing his old job in a new company.
We are looking forward to keep on interacting and cooperating with
the many great people we have met in the past. And of course we
are eagerly looking forward to make new acquintances. Working together
we can take RF and microwave instrumentation beyond S-parameters!
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