Isolated extended drain NMOS（EDNMOS） transistors are widely used in power signal processing.The hole current induced by a high electric field can result in a serious reliability problem due to a parasitic NPN effect...Isolated extended drain NMOS（EDNMOS） transistors are widely used in power signal processing.The hole current induced by a high electric field can result in a serious reliability problem due to a parasitic NPN effect. By optimizing p-type epitaxial（p-epi） thickness,n-type buried layer（BLN） and nwell doping distribution,the peak electric field is decreased by 30%and the peak hole current is decreased by 60%,which obviously suppress the parasitic NPN effect.Measured I-V characteristics and transmission line pulsing（TLP） results show that the onstate breakdown voltage is increased from 28 to 37 V when 6 V Vgs is applied and the energy capability is improved by about 30%,while the on-state resistance remains unchanged.展开更多
It has been reported that the ply gap influences the ballistic resistance of spaced multi-ply fabric systems,but its working mechanism was not well-understood. This paper reports the experimental and numerical approac...It has been reported that the ply gap influences the ballistic resistance of spaced multi-ply fabric systems,but its working mechanism was not well-understood. This paper reports the experimental and numerical approaches and results of an investigation on the mechanisms that enable the improved ballistic performance of spaced multi-ply systems. Penetration tests were performed over a range of impact velocities ranging from 200 m/s to 400 m/s. The results confirmed that the ply gap is beneficial to the energy absorption capability of the systems. This is because the front plies tend to absorb more energy when they are not immediately constrained by the rear plies. During a ballistic event, the gap relieves the reflection of the compressive pulse, prolonging the projectile engagement time with the front plies;on the other hand, the rear plies become increasingly less active in dissipating energy as the gap increases.When the gap is sufficiently widened to avoid any interference between the plies before the failure of the front ply, the responses of the whole system no longer vary. It was also found that the ballistic performance of the spaced systems is influenced by ply thickness, impact velocity, and the stacking order of the ply gap.展开更多
文摘Isolated extended drain NMOS（EDNMOS） transistors are widely used in power signal processing.The hole current induced by a high electric field can result in a serious reliability problem due to a parasitic NPN effect. By optimizing p-type epitaxial（p-epi） thickness,n-type buried layer（BLN） and nwell doping distribution,the peak electric field is decreased by 30%and the peak hole current is decreased by 60%,which obviously suppress the parasitic NPN effect.Measured I-V characteristics and transmission line pulsing（TLP） results show that the onstate breakdown voltage is increased from 28 to 37 V when 6 V Vgs is applied and the energy capability is improved by about 30%,while the on-state resistance remains unchanged.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51708553, 12202498, 52371299,12302187)Natural Science Foundations of Jiangsu Province (Grant No. BK20210438)Knowledge Innovation Program of WuhanShuguang Project (Grant No. 202201080102)。
文摘It has been reported that the ply gap influences the ballistic resistance of spaced multi-ply fabric systems,but its working mechanism was not well-understood. This paper reports the experimental and numerical approaches and results of an investigation on the mechanisms that enable the improved ballistic performance of spaced multi-ply systems. Penetration tests were performed over a range of impact velocities ranging from 200 m/s to 400 m/s. The results confirmed that the ply gap is beneficial to the energy absorption capability of the systems. This is because the front plies tend to absorb more energy when they are not immediately constrained by the rear plies. During a ballistic event, the gap relieves the reflection of the compressive pulse, prolonging the projectile engagement time with the front plies;on the other hand, the rear plies become increasingly less active in dissipating energy as the gap increases.When the gap is sufficiently widened to avoid any interference between the plies before the failure of the front ply, the responses of the whole system no longer vary. It was also found that the ballistic performance of the spaced systems is influenced by ply thickness, impact velocity, and the stacking order of the ply gap.
