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Hot Electrons in Base:Transition from Diffusive to Nonequilibrium Transport
Khrenov, G.,Ryzhii, V.,Kartashov, S. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
The influence of the electron transport in the base of a heterojunction bipolar transistor on its steady-state and high-frequency characteristics is investigated by an ensemble Monte Carlo particle method. A new method of HBT high-frequency performance calculation based on the .Fourier analysis of the, non-stationary current is proposed and implemented. It is found that for tile base thicknee less than 0.06 ㎛ the, nonequlibrium electron transport in the base causes a base cut-off frequency f_B to vary as the reciprocal of the base thickness in contrast with the prediction of the diffusive theory.
VERTICAL SCALING OF INP/INGAAS HETEROJUNCTION BIPOLAR TRANSISTORS
Khrenov,G.,Kulkova,E. 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
The vertical scaling of InP/InGaAs heterojunction bipolar transistors (HBTs) is thoroughly investigated by using an ensemble Monte Carlo particle method. It is found that vertical scaling of collector layer alone without reduction of parasitic resistances, in particular, collector series resistance cannot be considered as a promising method to improve overall speed performance of InP/InGaAs HBTs due to the drastic increase of the collector capacitance charging time in HBTs with very than collector layer.
Simulation of HBTs and HIGFETs Based on AIGaAs GaAs Heterostructures
Khrenov, G.,Ryzhii, V.,Kartashov, S. 대한전자공학회 1991 ICVC : International Conference on VLSI and CAD Vol.2 No.1
The software packages for Monte-Carlo particle simulation of HBT and HIGFET electrical characteristics were developed and applied. High-frequency performances and current-voltage characteristics of HBTs and HIGFETs were evaluated under different operation conditions. Both HBT with conventional doped collector and HBT with selectively doped collector have been investigated and compared. HIGFET's scaling down set with gate length from 1.0 to 0.2 ㎛ was considered. It was shown that developed software packages may be efficient for HBT and HIGFET performances evaluation and structure optimization.
The TUS Detector of Extreme Energy Cosmic Rays on Board the Lomonosov Satellite
Klimov, P. A.,Panasyuk, M. I.,Khrenov, B. A.,Garipov, G. K.,Kalmykov, N. N.,Petrov, V. L.,Sharakin, S. A.,Shirokov, A. V.,Yashin, I. V.,Zotov, M. Y.,Biktemerova, S. V.,Grinyuk, A. A.,Grebenyuk, V. M. Springer-Verlag 2017 Space science reviews Vol.212 No.3
<P>It will also be able to register slower atmospheric transient events: atmospheric fluorescence in electrical discharges of various types including precipitating electrons escaping the magnetosphere and from the radiation of meteors passing through the atmosphere. We describe the design of the TUS detector and present results of different ground-based tests and simulations.</P>
Kim, Ji Eun,Lee, Jik,Park, A. H.,Park, I. H.,Garipov, G. K.,Khrenov, B. A.,Klimov, P. A.,Panasyuk, M. I. 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
The TUS (tracking ultraviolet setup) experiment is intended for the observation from space of ultraviolet (UV) fluorescence induced both by ultra-high-energy cosmic rays (UHECRs) with energies above 5 x 10(19) eV and by transient luminous events (TLEs) occurring in the upper atmosphere. These two types of events are very different in terms of duration, lateral shape, and intensity; thus, each behaves as a background for the other. The TUS is equipped with two conventional pinhole cameras as auxiliary instrumentation to detect and efficiently distinguish TLEs from UHECRs. Each pinhole camera contains a MAPMT (multi-anode photo-multiplier tube) and its associated analog and digital electronics. The R11265-03-M64 MAPMT has been custom-made for space applications by Hamamatsu Photonics, particularly for the future EUSO (Extreme Universe Space Observatory) UHECR space mission. Thus, the TUS pinhole system will be the test bench for the deployment in space of a large number, similar to 5000, of MAPMTs. In this study, we present the design and fabrication of the pinhole cameras, and we estimate the detectability of TLEs with respect to atmospheric light background.
Jieun Kim,Jik Lee,A. H. Park,I. H. Park,G. K. Garipov,B. A. Khrenov,P. A. Klimov,M. I. Panasyuk 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.5
The TUS (tracking ultraviolet setup) experiment is intended for the observation from space of ultraviolet(UV) fluorescence induced both by ultra-high-energy cosmic rays (UHECRs) with energiesabove 5 × 1019 eV and by transient luminous events (TLEs) occurring in the upper atmosphere. These two types of events are very different in terms of duration, lateral shape, and intensity; thus,each behaves as a background for the other. The TUS is equipped with two conventional pinholecameras as auxiliary instrumentation to detect and efficiently distinguish TLEs from UHECRs. Each pinhole camera contains a MAPMT (multi-anode photo-multiplier tube) and its associatedanalog and digital electronics. The R11265-03-M64 MAPMT has been custom-made for space applicationsby Hamamatsu Photonics, particularly for the future EUSO (Extreme Universe SpaceObservatory) UHECR space mission. Thus, the TUS pinhole system will be the test bench for thedeployment in space of a large number, 5000, of MAPMTs. In this study, we present the designand fabrication of the pinhole cameras, and we estimate the detectability of TLEs with respect toatmospheric light background.
A New Type of Space Telescope for Observation of Extreme Lightning Phenomena in the Upper Atmosphere
Lee, J.,Kim, J. E.,Na, G. W.,Jeon, J. A.,Jeong, S.,Jung, A.,Lee, H. Y.,Nam, J. W.,Suh, J. E.,Garipov, G.,Klimov, P.,Khrenov, B. A.,Panasyuk, M. I.,Vedenkin, N. N.,Park, I. H. IEEE 2012 IEEE transactions on geoscience and remote sensing Vol.50 No.10
<P>A new type of space telescope with a 3 mm × 3 mm Micro-Electro-Mechanical System (MEMS) micromirror array has been fabricated and launched into space. This telescope has unique features: a wide field of surveillance view, and fast zoom-in and tracking capabilities. Although the micromirror array area is small, the space telescope was capable of observing the space-time development of extreme lightning in the upper atmosphere. It fulfilled its purpose by proving the principles of a space telescope. The concept and technologies used in this telescope can be extended to large MEMS space telescopes for future missions for earth and space science, including gamma ray bursts and ultra high energy cosmic rays. The performance of the space telescope during the ground test before launch as well as its performance in space are here presented to demonstrate the fast zoom-in and tracking capabilities of the telescope.</P>