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阐述了毫米波系统级封装(SOP)架构中基板功能化的概念、作用及实现方法。提出了利用低温共烧陶瓷(LTCC)技术,在SOP多层陶瓷基板中一体化集成多种无源电路单元,使封装基板在作为表面贴装有源芯片载体的同时,自身具备相应的无源射频功能。最终通过设计实例的仿真、加工及测试对比,验证了在SOP架构下实现封装基板功能化的可行性,及其所具有的良好的射频滤波、层间信号互联、射频接口过渡等电气性能。 相似文献
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This study discusses various influences on firms to provide additional environmental disclosure and empirically measures and analyzes the extent of actual environmental disclosures included in the annual reports of firms in the U.S. and Canada. The environmental disclosure content provided in the annual reports of firms is evaluated based on environmental reporting guidelines published by the American Institute of Public Accountants and the Canadian Institute of Chartered Accountants. In general, the results indicate that U.S. firms provided a significantly higher level of environmental disclosure than did Canadian firms. Also, firms in each nation varied significantly in the amount of environmental disclosure provided in each of four annual report sections. 相似文献
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高职院校作为中国高等教育的组成部分,在当下的发展阶段存着一些固有问题,这些问题也体现在学生干部及其团队的日常工作当中。如何改善学生干部团队的运营?有专家认为引入SOP这种管理工具是方法之一。本文所要探讨的是SOP在地方性高校具体的个案实施中的适用性、编写、培训、运营、反馈方面的技巧和操作方式方面的问题,并总结出SOP制度在高职院校学生工作的应用的共性。 相似文献
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