将去耦电容直接放在IC封装内可以有效控制EMI并提高信号的完整性,本文从IC内 部封装入手,分析EM的来源、IC封装在EM控制中的作用,进而提出11个有效控制EM 的设计规则,包括封装选择、引脚结构考虑、输出驱动器以及去耦电容的设计方法等,有助 于设计工程师在新的设计中选择最合适的集成电路芯片,以达到最佳EM抑制的性能 现有的系统级EM控制技术包括

Directions: There are 3 passages in this unit. Each passage is followed by some questions or unfinished statements For each of them there are four choices marked A), B), C)and

Reading Comprehension Directions: There are 3 passages in this unit. Each passage is followed by some questions or unfinished statements For each of them there are four choices marked A), B), C)and

Unit 5 Reading Comprehension Directions: There are 3 passages in this unit. Each passage is followed by some questions or unfinished statements For each of them there are four choices marked A), B), C)and

Unit 1 Reading o Directions: There are 3 passages in this unit. Each passage is followed by some questions or unfinished statements For each of them there are four choices marked A), B), C)and

Unit 7 1. The bridge was named the hero who gave his life for the course of the people B)from C)after D)with

Unit 5 1. The new washing machines are at the rate of fifty a d A)turned out B) C) turned down D)turned in

Test 1 Directions: Choose from A), B, C and D) the best answer to complete each of the following sentences 1. No one takes him any more, he's become a figure of fun A)earnestly B)seriously

在 There be句型中 There is no smoke without fire There seems to be little time left There,here结构中,如果主语有好几个,谓语动词 与最邻近的主语一致。 There was a TV set, a portrait and several albums on the shelf

1. for the people is a glorious death. a. To die b.Dead c. To be died d. Being died