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February 12, 2014

Mtg: Embrace Circuit Nonlinearity to Get Transmitter Linearity and Energy Efficiency

by @ 4:53 pm. Filed under ALL, Communications, Electronics Design, Semiconductors

THURSDAY March 13, 2014
SCV Microwave Theory and Techniques Chapter
– low distortion, polar-modulation, maximally efficient …
Speaker: Earl McCune, Besser Associates (IEEE-MTT Distinguished Lecturer)
Time: Networking and snacks at 6:00 PM; Presentation at 6:30 PM
Cost: none
Place: Agilent Technologies, 5301 Stevens Creek Blvd, Santa Clara
RSVP: not required

Wireless communications signals have evolved greatly over the past century, from the 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 Shannon’s Capacity Limit combined with the Fourier Transform.
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 linearity of the transmitter.  Design of intentionally compressed circuitry is very different from conventional linear amplifier techniques, and these new design techniques will be discussed.
The presentation will cover 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 will bring 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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