Research
♦ Ph.D. Dissertation Proposal
New Pulsed-IV Pulsed-RF Measurement Techniques for Characterizing Power FETs
for Pulsed RF Power Amplifier Design, Dec. 2006
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♦ Publications
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S. J. Doo, P. Roblin, V. Balasubramanian, R. Taylor, K. Dandu, G. H. Jessen, and R. Rojas, ″Adaptive second harmonic active load for pulsed-IV/RF class-B operation,″
in ARFTG 70th Conf. Dig.,
Tempe, AZ, Nov. 2007.
Presentation slide!
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P. Roblin, S. J. Doo, X. Cui, G. H. Jessen, D. Chaillot, and J. Strahler,
″New ultrafast real-time active load-pull measurements for high-speed RF power amplifier design,″
in IEEE MTT-S Int. Microwave Symp.,
Honolulu, HI, June 2007.
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I. Suh, S. J. Doo, P. Roblin, X. Cui, Y. G. Kim, J. Strahler, M. V. Bossche, R. Rojas, and H. D. Kim,
″Negative input resistance and real-time active load-pull measurements of a 2.5GHz oscillator using a LSNA,″
in ARFTG 69th Conf. Dig.,
Honolulu, HI, June 2007.
Presentation slide!
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S. J. Doo, P. Roblin, G. H. Jessen, R. C. Fitch, J. K. Gillespie, N. A. Moser, A. Crespo, G. Simpson, and J. King,
″Effective suppression of IV knee walk-out in AlGaN/GaN HEMTs for pulsed-IV pulsed-RF with a large signal network analyzer,″
IEEE Microwave and Wireless Components Letters,
vol. 16, no. 12, pp. 681-683, Dec. 2006.
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X. Cui, S. J. Doo, P. Roblin, G. H. Jessen, and R. G. Rojas,
″Real-time active load-pull of the 2nd & 3rd harmonics for interactive design of non-linear power amplifier,″
in ARFTG 68th Conf. Dig., Broomfield, CO, Nov. 2006.
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Y. Bayram, S. K. Myoung, S. J. Doo, P. Roblin, and J. Volakis,
″Experimental and theoretical analysis of digital modulation schemes and RF power amplifiers subject to electromagnetic interference,″
in 2006 National Radio Science Meeting.
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C. Garuda, X. Cui, P.-C. Lin, S. J. Doo, P. Zhang, and M. Ismail,
″A 3-5 GHz fully differential CMOS LNA with dual-gain mode for wireless UWB applications,″
48th Midwest Symp. on Circuits and Systems, pp.790-793, Aug. 2005.
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S. J. Doo, P. Roblin, S. Lee, D. Chaillot, and M. V. Bossche,
″Pulsed-IV pulsed-RF measurements using a large signal network analyzer,″
in ARFTG 65th Conf. Dig., Long Beach, CA, June 2005.
Presentation slide!
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D. Chaillot, P. Roblin, S. K. Myoung, M. Debnath, and S. J. Doo,
″Correction large bande des non linéarités dynamiques d′un amplificateur de puissance par prédistorsion numérique,″
14èmes Journées Nationales Microondes, Nantes, France, Mai 2005.
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S. K. Myoung, D. Chaillot, P. Roblin, W. Dai, and S. J. Doo,
″Volterra characterization and predistortion linearization of multi-carrier power ampliflers,″
in ARFTG 64th Conf. Dig., Florida, Dec. 2004.
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S. K. Myoung, X. Cui, D. Chaillot, P. Roblin, F. Verbeyst, M. V. Bossche, S. J. Doo, and W. Dai,
″Large signal network analyzer with trigger for baseband & RF system characterization with application to K-modeling & output baseband modulation linearization,″
in ARFTG 64th Conf. Dig., Florida, Dec. 2004.