机电工程专业英语ppt
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机电专业英语复习资料一 1.1 Bipolar junction transistorsToday, industrial electronic systems employseveral devices that are described by the term transistor. Each type of transistor has different characteristics and operational conditions that are used to distinguish it from others.每种晶体管都有区别于其它种类的特征和工作环境。
In the first part of this discussion, we are concerned with the . Structurally, this transistor is described as bipolar because it has two different current-carrier polarities.首先探讨双极型晶体管。
从结构上看,这种晶体管被称为双极是因为它具有两种不同的电流载流子电极。
Holes are positive current carriers, whereas electrons are negative current carriers.空穴是正的载流子,电子是负的电流载流子。
Two distinct kinds of semiconductor crystals are connected together by a common element. 两种截然不同的半导体晶体通过公共元件连接在一起。
The structure of this device is similar to that of two diodes connected back to back, with one crystal being common to both junctions. The center material is usually made thinner than the two outside pieces. 该器件的结构类似于背靠背连接的两个二极管的结构,一个晶体同时属于两个结。