scholarly journals Modeling of a GaN Based Static Induction Transistor

1999 ◽  
Vol 4 (S1) ◽  
pp. 697-702 ◽  
Author(s):  
Gabriela E. Bunea ◽  
S.T. Dunham ◽  
T.D. Moustakas
Keyword(s):  
Operating Conditions ◽  
Short Channel ◽  
Flow Equations ◽  
Static Induction Transistors ◽  
Thermal Boundary Conditions ◽  
Heating Effects ◽  
Device Structures ◽  
Static Induction Transistor ◽  
Static Induction ◽  
Voltage Swing

Static induction transistors (SITs) are short channel FET structures which are suitable for high power, high frequency and high temperature applications. GaN has particularly favorable properties for SIT operation. However, such a device has not yet been fabricated. In this paper we report simulation studies on GaN static induction transistors over a range of device structures and operating conditions. The transistor was modeled with coupled drift-diffusion and heat-flow equations. We found that the performance of the device depends sensitively on the thermal boundary conditions, as self-heating effects limit the maximum voltage swing.

Modeling of a GaN Based Static Induction Transistor

1998 ◽  
Vol 537 ◽  
Author(s):  
Gabriela E. Bunea ◽  
S.T. Dunham ◽  
T.D. Moustakas
Keyword(s):  
Operating Conditions ◽  
Short Channel ◽  
Flow Equations ◽  
Static Induction Transistors ◽  
Thermal Boundary Conditions ◽  
Heating Effects ◽  
Device Structures ◽  
Static Induction Transistor ◽  
Static Induction ◽  
Voltage Swing

AbstractStatic induction transistors (SITs) are short channel FET structures which are suitable for high power, high frequency and high temperature applications. GaN has particularly favorable properties for SIT operation. However, such a device has not yet been fabricated. In this paper we report simulation studies on GaN static induction transistors over a range of device structures and operating conditions. The transistor was modeled with coupled drift-diffusion and heat-flow equations. We found that the performance of the device depends sensitively on the thermal boundary conditions, as self-heating effects limit the maximum voltage swing.

Silicon Carbide Static Induction Transistor with Implanted Buried Gate

2009 ◽  
Vol 615-617 ◽  
pp. 735-738
Author(s):  
Konstantin Vassilevski ◽  
Irina P. Nikitina ◽  
Alton B. Horsfall ◽  
Nicolas G. Wright ◽  
Anthony G. O'Neill ◽  
...  
Keyword(s):  
Source Region ◽  
High Energy ◽  
Thermally Activated ◽  
Static Induction Transistors ◽  
Current Densities ◽  
Static Induction Transistor ◽  
Heavily Doped ◽  
Static Induction ◽  
Sic Wafer ◽  
Post Implantation

Buried gate static induction transistors (BGSITs) were fabricated on commercial 4H-SiC wafer with 20 m thick n-type epilayer having a net donor density of 0.71015 cm-3. Buried gate regions were formed by the selective implantation of high energy (up to 2 MeV) aluminium performed at 600 °C. Nitrogen was implanted at temperature of 400 °C to form a heavily doped blanket source region. Post-implantation annealing was carried out at the atmospheric pressure in argon using a graphite capping layer. Fabricated normally-on devices with source contact diameter of 0.2 mm were tested at temperatures up to 500 °C and current densities up to 270 A/cm2. The specific on-resistance of a completely open 4H-SiC BGSIT was 34 mcm2 and showed a thermally activated behaviour at temperatures up to 500 °C.

scholarly journals Heat Transfer in Rotating Serpentine Passages With Trips Normal to the Flow

1992 ◽  
Vol 114 (4) ◽  
pp. 847-857 ◽  
Author(s):  
J. H. Wagner ◽  
B. V. Johnson ◽  
R. A. Graziani ◽  
F. C. Yeh
Keyword(s):  
Heat Transfer ◽  
Turbine Blade ◽  
Large Scale ◽  
Flow Direction ◽  
Operating Conditions ◽  
Transfer Model ◽  
Transfer Coefficients ◽  
Flow Equations ◽  
Turbine Blade Cooling ◽  
Heat Transfer Coefficients

Experiments were conducted to determine the effects of buoyancy and Coriolis forces on heat transfer in turbine blade internal coolant passages. The experiments were conducted with a large-scale, multipass, heat transfer model with both radially inward and outward flow. Trip strips on the leading and trailing surfaces of the radial coolant passages were used to produce the rough walls. An analysis of the governing flow equations showed that four parameters influence the heat transfer in rotating passages: coolant-to-wall temperature ratio, Rossby number, Reynolds number, and radius-to-passage hydraulic diameter ratio. The first three of these four parameters were varied over ranges that are typical of advanced gas turbine engine operating conditions. Results were correlated and compared to previous results from stationary and rotating similar models with trip strips. The heat transfer coefficients on surfaces, where the heat transfer increased with rotation and buoyancy, varied by as much as a factor of four. Maximum values of the heat transfer coefficients with high rotation were only slightly above the highest levels obtained with the smooth wall model. The heat transfer coefficients on surfaces where the heat transfer decreased with rotation, varied by as much as a factor of three due to rotation and buoyancy. It was concluded that both Coriolis and buoyancy effects must be considered in turbine blade cooling designs with trip strips and that the effects of rotation were markedly different depending upon the flow direction.

Effect of gate insulating layer on organic static induction transistor characteristics

2009 ◽  
Vol 518 (2) ◽  
pp. 514-517 ◽  
Author(s):  
Fanghua Pu ◽  
Yasuyuki Watanabe ◽  
Hiroshi Yamauchi ◽  
Masakazu Nakamura ◽  
Kazuhiro Kudo
Keyword(s):  
Insulating Layer ◽  
Static Induction Transistor ◽  
Static Induction

Temperature properties of the static induction transistor

1981 ◽  
Vol 24 (2) ◽  
pp. 105-107 ◽  
Author(s):  
Piotr Płotka ◽  
Bogdan Wilamowski
Keyword(s):  
Static Induction Transistor ◽  
Static Induction

Slow flow solutions and stability analysis of single machine to infinite bus power systems

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
M. G. Suresh Kumar ◽  
C. A. Babu
Keyword(s):  
Power Systems ◽  
Power System ◽  
Single Machine ◽  
Multiple Scales ◽  
Operating Conditions ◽  
Phase Portraits ◽  
Slow Flow ◽  
Approximate Analytical Expression ◽  
Flow Equations ◽  
Load Angle

Abstract Nonlinearity is a major constraint in analysing and controlling power systems. The behaviour of the nonlinear systems will vary drastically with changing operating conditions. Hence a detailed study of the response of the power system with nonlinearities is necessary especially at frequencies closer to natural resonant frequencies of machines where the system may jump into the chaos. This paper attempt such a study of a single machine to infinite bus power system by modelling it as a Duffing equation with softening spring. Using the method of multiple scales, an approximate analytical expression which describes the variation of load angle is derived. The phase portraits generated from the slow flow equations, closer to the jump, display two stable equilibria (centers) and an unstable fixed point (saddle). From the analysis, it is observed that even for a combination of parameters for which the system exhibits jump resonance, the system will remain stable if the variation of load angle is within a bounded region.

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