The impacts ofsubstrate parasitic resistance and drain ballast resistance on electrostatic discharge （ESD） robustness of LDMOS are analyzed. By increasing the two parasitic resistances, the ESD robustness of LDMOS a...The impacts ofsubstrate parasitic resistance and drain ballast resistance on electrostatic discharge （ESD） robustness of LDMOS are analyzed. By increasing the two parasitic resistances, the ESD robustness of LDMOS are significantly improved. The proposed structures have been successfully verified in a 0.35μm BCD process without using additional process steps. Experimental results show that the second breakdown current of the optimal structure increases to 3,5 A, which is about 367% of the original device.展开更多
AIM： To analyze the epidemiological, clinical and laboratory findings of infectious keratitis.METHODS： A retrospective study on cases of infective keratitis, attended our institution from Mar. 2013 to Feb. 2015, was...AIM： To analyze the epidemiological, clinical and laboratory findings of infectious keratitis.METHODS： A retrospective study on cases of infective keratitis, attended our institution from Mar. 2013 to Feb. 2015, was done at Mansoura Ophthalmic Center, Egypt. Corneal scrapings were performed and processed for direct microscopy and culture in appropriate media using standard laboratory protocols.RESULTS： Out of 245 patients enrolled for study, 247 corneal scrapings were obtained. Ocular trauma was the most common predisposing factor （51.4%）, followed by diabetes mellitus （15.1%）. Cultures were positive in 110 scraping samples （44.5%）： 45.5% samples had pure fungal infection, 40% had pure bacterial infections and 10% had mixed fungal and bacterial growths. Acanthamoeba was detected in 5 （4.5%） samples. The most common fungal pathogen was Aspergillus spp. （41%）. The most common bacterial isolates were Staphylococcus aureus （38.2%） and Pseudomonas aeruginosa （21.8%）.CONCLUSION： Incidence of fungal keratitis is high in our region. Therapeutic approach can initially be based on clinical features and sensitivity/resistance patterns. Microbiological research should direct the antimicrobial treatment. Antibiotic resistance to fluoroquinolones and aminoglycosides is an important consideration.展开更多
为解决集成电路的全芯片静电防护设计中寄生电阻导致的防护空间压缩问题,提出了一种实用的能够在版图设计过程中提高集成电路静电放电(ESD)防护能力的仿真方法,用于评估和控制ESD电流通路上的寄生电阻,辅助ESD防护设计,预估器件静电防...为解决集成电路的全芯片静电防护设计中寄生电阻导致的防护空间压缩问题,提出了一种实用的能够在版图设计过程中提高集成电路静电放电(ESD)防护能力的仿真方法,用于评估和控制ESD电流通路上的寄生电阻,辅助ESD防护设计,预估器件静电防护等级。详细介绍了仿真方法的原理和流程,以0.18μm SOI CMOS工艺制造的静态随机存储器电路为仿真和实验对象,应用此仿真方法,统计寄生电阻值,优化ESD防护设计,并进行ESD测试,记录未优化样品和优化样品的失效电压。通过对比寄生电阻和失效电压,证明降低寄生电阻可获得更好的ESD防护性能,而且器件失效电压和关键寄生电阻值R Vdd之间存在近似线性反比关系。展开更多
基金Project supported by the National natural Science Foundation of China(No.60906038)
文摘The impacts ofsubstrate parasitic resistance and drain ballast resistance on electrostatic discharge （ESD） robustness of LDMOS are analyzed. By increasing the two parasitic resistances, the ESD robustness of LDMOS are significantly improved. The proposed structures have been successfully verified in a 0.35μm BCD process without using additional process steps. Experimental results show that the second breakdown current of the optimal structure increases to 3,5 A, which is about 367% of the original device.
文摘AIM： To analyze the epidemiological, clinical and laboratory findings of infectious keratitis.METHODS： A retrospective study on cases of infective keratitis, attended our institution from Mar. 2013 to Feb. 2015, was done at Mansoura Ophthalmic Center, Egypt. Corneal scrapings were performed and processed for direct microscopy and culture in appropriate media using standard laboratory protocols.RESULTS： Out of 245 patients enrolled for study, 247 corneal scrapings were obtained. Ocular trauma was the most common predisposing factor （51.4%）, followed by diabetes mellitus （15.1%）. Cultures were positive in 110 scraping samples （44.5%）： 45.5% samples had pure fungal infection, 40% had pure bacterial infections and 10% had mixed fungal and bacterial growths. Acanthamoeba was detected in 5 （4.5%） samples. The most common fungal pathogen was Aspergillus spp. （41%）. The most common bacterial isolates were Staphylococcus aureus （38.2%） and Pseudomonas aeruginosa （21.8%）.CONCLUSION： Incidence of fungal keratitis is high in our region. Therapeutic approach can initially be based on clinical features and sensitivity/resistance patterns. Microbiological research should direct the antimicrobial treatment. Antibiotic resistance to fluoroquinolones and aminoglycosides is an important consideration.
文摘为解决集成电路的全芯片静电防护设计中寄生电阻导致的防护空间压缩问题,提出了一种实用的能够在版图设计过程中提高集成电路静电放电(ESD)防护能力的仿真方法,用于评估和控制ESD电流通路上的寄生电阻,辅助ESD防护设计,预估器件静电防护等级。详细介绍了仿真方法的原理和流程,以0.18μm SOI CMOS工艺制造的静态随机存储器电路为仿真和实验对象,应用此仿真方法,统计寄生电阻值,优化ESD防护设计,并进行ESD测试,记录未优化样品和优化样品的失效电压。通过对比寄生电阻和失效电压,证明降低寄生电阻可获得更好的ESD防护性能,而且器件失效电压和关键寄生电阻值R Vdd之间存在近似线性反比关系。
