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Electrostatic discharge(ESD) phenomena involve both electrical and thermal effects,and a direct electrostatic discharge to an electronic device is one of the most severe threats to component reliability.Therefore, the electrical and thermal stability of multifinger microwave bipolar transistors(BJTs) under ESD conditions has been investigated theoretically and experimentally.100 samples have been tested for multiple pulses until a failure occurred.Meanwhile,the distributions of electric field,current density and lattice temperature have also been analyzed by use of the two-dimensional device simulation tool Medici.There is a good agreement between the simulated results and failure analysis.In the case of a thermal couple,the avalanche current distribution in the fingers is in general spatially unstable and results in the formation of current crowding effects and crystal defects.The experimental results indicate that a collector-base junction is more sensitive to ESD than an emitter-base junction based on the special device structure.When the ESD level increased to 1.3 kV,the collector-base junction has been burnt out first.The analysis has also demonstrated that ESD failures occur generally by upsetting the breakdown voltage of the dielectric or overheating of the aluminum-silicon eutectic.In addition,fatigue phenomena are observed during ESD testing,with devices that still function after repeated low-intensity ESDs but whose performances have been severely degraded. 相似文献
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通过理论建模和试验测试的方法研究了多指结构微波双极型晶体管在静电放电作用下的热稳定性和电稳定性。选择2SC3356作为受试器件,对100个测试样本进行人体模型静电放电注入实验,并从器件内部电场强度、电流密度和温度分布变化出发,用二维器件级仿真软件辅助分析了在静电放电应力下其内在损伤过程与机理。由于指间热耦合的存在,雪崩电流在各指上分布不均,局部的电流拥挤和过热效应会导致晶格损伤。试验结果表明,由于特殊的物理结构,受试器件对静电放电最敏感的端对并不是EB结,而是CB结,当静电放电电压增大到1.3KV时,CB结首先损坏。失效分析进一步表明静电放电引起的失效机理通常是介质层的击穿和局部铝硅共晶体的过热融化。静电放电注入实验的过程中存在积累效应,多次低强度的注入测试会导致潜在性失效并使器件性能大幅下降。 相似文献
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随着通信系统面临的电磁工作环境越来越严峻,高功率容量、低插损、快响应时间的电磁脉冲防护模块对其射频前端电路的保护越发的重要起来.本文主要基于PIN二级管射频限幅的原理,构建了PIN二极管的时域等效电路模型,利用去嵌入阻抗场计算方法提取相应电路的S参数,优化设计匹配网络,并采用无源多级PIN二极管结构,设计了一个工作于0~200MHz,插入损耗小于0.15dB,驻波比小于1.4dB,响应时间小于1ns的短波通信电磁脉冲防护模块.结合PIN二极管时域等效电路模型,利用先进设计系统(Advanced Design System,ADS)仿真软件对电磁脉冲防护模块限幅性能进行仿真,并对加工出来的电磁脉冲防护模块进行了测试,结果验证了各项指标满足要求. 相似文献
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