Analytical collector current density and base transit time models for high-injection regions

1992 ◽  
Author(s):  
Suzuki
Keyword(s):  
Transit Time ◽  
Current Density ◽  
Collector Current ◽  
High Injection

A physics-based high-injection transit-time model applied to barrier effects in SiGe HBTs

2002 ◽  
Vol 49 (10) ◽  
pp. 1807-1813 ◽  
Author(s):  
Qingqing Liang ◽  
J.D. Cressler ◽  
Guofu Niu ◽  
R.M. Malladi ◽  
K. Newton ◽  
...  
Keyword(s):  
Transit Time ◽  
Time Model ◽  
Barrier Effects ◽  
High Injection

4H-SiC monolithic Darlington transistors with slight current gain drop at high collector current density

2018 ◽  
Vol 61 (8) ◽  
pp. 1238-1243
Author(s):  
Lei Yuan ◽  
QingWen Song ◽  
XiaoYan Tang ◽  
HongPeng Zhang ◽  
YiMeng Zhang ◽  
...  
Keyword(s):  
Current Density ◽  
Current Gain ◽  
Collector Current

scholarly journals Design and Experiments of the Sheet Electron Beam Transport with Periodic Cusped Magnetic Focusing for Terahertz Traveling-Wave Tubes

Electronics ◽  
2021 ◽  
Vol 10 (24) ◽  
pp. 3051
Author(s):  
Changqing Zhang ◽  
Pan Pan ◽  
Xueliang Chen ◽  
Siming Su ◽  
Bowen Song ◽  
...  
Keyword(s):  
Electron Beam ◽  
Current Density ◽  
Traveling Wave ◽  
High Current Density ◽  
Operating Voltage ◽  
Cathode Voltage ◽  
Collector Current ◽  
Compact Size ◽  
Sheet Electron Beam ◽  
Traveling Wave Tubes

The successful transport of a sheet electron beam under the periodic cusped magnet (PCM) focusing at the terahertz frequencies is reported. The sheet beam with a current density of 285 A/cm2 is intended for the developing G-band sheet-beam traveling-wave tube (TWT) whose operating voltage is nominally 24.5 kV. A beamstick was developed to validate the design of the electron optics system, which is considered as the most challenging part for developing a sheet-beam device. A beam transmission ratio of 81% is achieved over a distance of 37.5 mm at a cathode voltage of −25.0 kV. The total current and the collector current were measured to be 125 and 102 mA, respectively. The experimental results are promising, demonstrating that the PCM scheme is capable of focusing a high-current-density sheet beam and hence can find use in the terahertz TWTs, offering the advantages of compact size and light weight.

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