电子信息专业英语Unit 3.pptVIP

电子信息专业英语Unit 3 Integrated Circuits Contents Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Knowledge about Translation Knowledge about Translation Knowledge about Translation Knowledge about Translation Classroom Reading Classroom Reading Classroom Reading Classroom Reading Classroom Reading Classroom Reading Classroom Reading Classroom Reading Once they’d gotten slight amplification with that tiny drop of water, Bardeen and Brattain figured they were on the road to something worthwhile. Using different materials and different setups and different electrolytes in place of the water, the two men tried to get an even bigger increase in current. Then on December 8 Bardeen suggested they replace the silicon with germanium. They got a current jump, all right—an amplification of some 330 times—but in the exact opposite direction they’d expected. Instead of moving the electrons along, the electrolyte was getting the holes moving. But amplification is amplification—it was a start. The Invention of the First Transistor November 17-December 23, 1947 Unfortunately this giant jump in amplification only worked for certain types of current—ones with very low frequencies. That wouldn’t work for a phone line which has to handle all the complex frequencies of a person’s voice. So the next step was to get it to work at all kinds of frequencies. Bardeen and Brattain thought it might be the liquid which was the problem. So they replaced it with germanium dioxide—which is essentially a little bit of germanium rust. Gibney prepared a special slab of germanium with a shimmering green oxide layer on one side. On December 12, Brattain began to insert the point contacts. The Invention of the First Transistor November 17-December 23, 1947 In fact the device worked as if there was no oxide layer at all. And as Brattain poked the gold contact in again and again, he realized that’s because t