1 R I T Rochester Institute of Technology A New High-Efficiency, Linear Power Amplification Design Technique Derived from Nonlinear Dynamical Systems Dr.
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R I TRochester Institute of Technology
A New High-Efficiency, Linear Power Amplification Design Technique Derived from
Nonlinear Dynamical Systems
Dr. Chance M. Glenn, Sr.
Associate Professor – Department of Electrical Computer and Telecommunications Engineering Technology
Director – The Laboratory for Wireless Networks and Advanced Communications Technology
•This talk describes the basis and implementation of a new concept in power amplifier design.
•This work represents a collaborative effort between the Laboratory for Wireless Networks and Advanced Communications Technology at RIT, and Syncrodyne Systems Corporation.
•The ongoing research effort has also been supported by DARPA, ARO, and MDA
•The goal is the commercial application of this technology in various forms of wireless telecommunications.
The term Syncrodyne derives from the concept of amplification using synchronous dynamics. Dynamically matched devices are used which lock to a signal of similar dynamics.
The green (applied) and blue (output) signals in this schematic representation come together (synchronize) and the error (red) goes to zero rapidly when the input is coupled.
The extent and effectiveness of Synchronization depends on the factors below: dc bias voltages of the source signal and the chaotic signal (Vsdc and Vcdc)
peak to peak voltage range of the two signals (Vsr and Vcr) fundamental frequencies of the two signals Value of coupling impedance in the coupling circuit
The factors mentioned above need to be properly matched to obtain maximum amplification of the source signal.
Increase in the extent of coupling would increase the gain and the efficiency of the signal produced.
The power amplifier system comprises of the following components: The dc power source (5 volts dc) – V_DC The chaotic oscillator The coupling network The modulated input source (GSM modulation at 800 MHz) The load impedance
The system SPA-S3-C2-BJT-SYS2 was simulated and the results obtained are as shown below. Other such circuits were simulated and the results are have been tabulated in an excel sheet.
•We’ve demonstrated Syncrodyne Power Amplification for GSM waveforms with PAE greater than 50% and gain approaching 20-dB
•We are implementing new techniques that should allow us to push the performance levels higher.
•The property of chaotic oscillators to adaptively conform to different waveform types is a key to this concept.
•We are able to achieve linear power amplification utilizing a nonlinear device, thus benefiting from the high efficiency capable in nonlinear operation.
•We intend to explore the benefit of this amplification concept in other technology settings.
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R I TRochester Institute of Technology
The Laboratory for Wireless Networks and Advanced Communications Technology
Goals
•Push the performance to PAE > 70%, gain > 30-dB
•Implement Series-3 design in hardware
•Design a SPA-S3 chip to meet commercial performance criteria
•Develop commercially viable testbed for performance evaluation
•Cultivate strategic partnerships for technology adoption.
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R I TRochester Institute of Technology
The Laboratory for Wireless Networks and Advanced Communications Technology
References
[1] E. Ott, C. Grebogi, J. A. Yorke, Phys. Rev. Lett. 64, 1196 (1990).[2] S. Hayes, C. Grebogi, E. Ott, Phys. Rev. Lett. 70, 3031 (1993).[3] H. Dedieu, M.P. Kennedy, and M. Hasler, “Chaos shift keying; Modulation and demodulation of a chaotic carrier using self-synchronizing Chua’s circuit,” IEEE Transactions on Circuits and Systems I, vol. 40, pp. 634-642, 1993.[4] C. M. Glenn, S. Hayes, Weak Signal Detection by Small-Perturbation Control of Chaotic Orbits, 1996 IEEE-MTT Symposium Digest (June 1996).[5] L. M. Pecora and T. L. Carroll, Synchronization in Chaotic Systems, Phys. Rev. Lett. 64, 821 (1990).[6] C. M. Glenn, Synthesis of a Fully-Integrated Digital Signal Source for Communications from Chaotic Dynamics-based Oscillations, Doctoral Dissertation, The Johns Hopkins University, January 2003.[7] C. M. Glenn, High-Gain, High-Efficiency Power Amplification for PCS, International Symposium on Advanced Radio Technology Digest, March 2003.[8] S. Cicarelli, Development of a Digital Wireless Communication System for Security Sensor Applications, Defense Nuclear Agency (Jan 1998)[9] Francis Moon, Chaotic Vibrations, Wiley & Sons, New York, 1987.[10] Edward Ott, Chaos in Dynamical Systems, Cambridge Univ. Press, Canada, 1993.