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On the convergence of a semi-Lagrangian scheme for the BGK model of the Boltzmann equation
Giovanni Russo,Piero Santagati,Seok-Bae Yun 한국산업응용수학회 2009 한국산업응용수학회 학술대회 논문집 Vol.2009 No.5
Recently, the first and second authors proposed a semi-Lagrangian scheme for the BGK model of the Boltzmann equation. In this talk, we show that the approximate distribution function of the scheme converges to the smooth solution of the BGK model. We also derive an explicit convergence estimate.
Myoungbo Kwak,Kimball, D. F.,Presti, C. D.,Scuderi, A.,Santagati, C.,Yan, J. J.,Asbeck, P. M.,Larson, L. E. IEEE 2012 IEEE transactions on microwave theory and techniqu Vol.60 No.6
<P>A high-performance bipolar-CMOS-DMOS (BCD) monolithic envelope amplifier for micro-base-station power amplifiers (PAs) is presented. Measurement of the BCD high-voltage (<I>V</I><SUB>DD</SUB> = 15 V) envelope amplifier shows an efficiency of 72% using 7.7-dB peak-to-average ratio WCDMA input signals at an average envelope amplifier output power above 3 W. A WCDMA envelope-tracking RF PA at 2.14 GHz, including a GaN field-effect transistor RF stage, has an overall drain efficiency above 51%, with a normalized power root-mean-square error below 1.2% and an adjacent channel leakage ratio of -49 dBc at 5-MHz offset using memory-effect mitigation digital pre-distortion, at an average output power above 2 W and a gain of 10 dB.</P>