IEEE Kansai section 会員各位
                                   IEEE MTT-S Kansai Chapter Chair 石崎 俊雄

IEEE Distinguished Microwave Lecturer講演会のご案内

IEEE MTT-S Kansai Chapterでは、Distinguished Microwave Lecturerに

【主催】 IEEE MTT-S Kansai Chapter
【共催】 IEEE MTT-S Japan Chapter, IEEE MTT-S Nagoya Chapter
【開催日時】 2016年5月19日(木) 14:00-14:50
【場所】 京都大学 宇治キャンパス 木質ホール
           (〒611-0011 京都府宇治市五ヶ庄)
【参加費等】 無料。どなたでも参加できます。
【講演者】  Dr. Earl McCune(RF Communications Consulting、
                    元Panasonic Emerging Advanced RF Laboratory)

Earl received his Bachelors, Masters, and Doctorate degrees at UC Berkeley,
Stanford, and UC Davis respectively.  His experience in RF circuits, signals,
and systems goes back more than 40 years.  Within this career he has
founded two Silicon Valley startups, the first one doing modulated direct digital
frequency synthesis in 1986 and merged with Proxim in 1991.
The second start-up, Tropian, did switch-based efficient RF transmitters from
1996 and was acquired by Panasonic 10 years later.  He retired from Panasonic
in 2008 as a Corporate Technology Fellow.  He now serves as visiting faculty at
TU Delft.

Earl has 81 issued patents in the USA.  He is a double author with Cambridge
University Press, first with Practical Digital Wireless Signals, and also with Dynamic
Power Supply Transmitters.  He is an IEEE MTT Distinguished Microwave Lecturer
since 2013.

Embrace Circuit Nonlinearity to get Transmitter Linearity and Energy Efficiency

Wireless communications signals have evolved greatly over the past century, from t
he use of Morse Code to very complicated digital modulation schemes such as
wideband CDMA (WCDMA) and 3GPP Long-term evolution (LTE). This progression
challenges the design of transmitters to be simultaneously energy efficient, low
distortion, and spectrally clean. The increasing peak-to-average power ratio (PAPR)
characteristic of these signals is a particular problem. Because it is important to
understand why this is happening this presentation begins with a discussion of the
physical implications of Ohm’s Law, Shannon's Capacity Limit, and the Fourier

A 'backwards' design perspective is then presented, where we begin design from a
maximally energy efficient circuit (a switch) and then make it generate the required
signals instead of the conventional approach of beginning with linear circuitry and
then finding ways to improve its energy efficiency. This directly leads to the
design and implementation of polar-modulation to improve both the energy
efficiency of the power amplifier and output signal accuracy of the transmitter.
Design of intentionally compressed circuitry is very different from conventional
linear amplifier techniques, and these new design techniques are discussed.

The presentation covers the use of both linear amplifiers and switches for the power
amplifier module, and the implications of using these approaches on the power supply
design, system integration, and performance measures. This presentation brings the
subjects of OFDM, Shannon's theorem, spectral efficiency, and switch-mode amplifiers
together in an exposition of polar modulation transmitters that is both entertaining
and informative.


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2016 IEEE MTT-S Kansai Chapter, Secretary
平塚 敏朗(