专业英语2概要.ppt

P95: It is evident in Figure 2-8 that the MOSFET exhibits bilateral symmetry. That is , channel carriers can be made to flow in either direction, depending on bias polarity. This symmetry is important in certain MOSFET applications. The two channel terminals have been named according to which one-supply carriers to the channel and which one receives carriers from it. These two terms are source and drain, respectively, and it is evident that bias polarity determines which is which. 2.2.3 MOSFET Definitions P97: It is possible………, this paragraph. 2.2.4 Universal Transfer Characteristics P98: Although the channel………, this paragraph. 2.2.4 Universal Transfer Characteristics P101: A number of MOSFET ……. This paragraph. 2.2.4 Universal Transfer Characteristics 2.2.5 Transconductance 2.3.2 Photonic Device The Bipolar Junction Transistor Construction 2.1.1 Structure and Technology The three terminal connections are called the emitter, Base, and collector. The width of the base region is small compared to the minority carrier diffusion length. The Bipolar Junction Transistor Construction 2.1.1 Structure and Technology The (++) and (+) notation indicates the relative magnitudes of the impurity doping concentrations normally used in the bipolar transistor, with (++) meaning very heavily doped and (+) meaning moderately doped. ■ Transistor Action 2.1.2 Biasers and Terminal Currents 1. The basic principle of operation The base-emitter(B-E)pn junction is forward-biased, and the base-collector(B-C) pn junction is reverse-biased. This configuration is called the forward-active operation mode. ■ Transistor Action 2.1.2 Biasers and Terminal Currents 1. The basic principle of operation As shown in Figure (b), the larger gradient in the electron concentration means that electrons injected from the emitter will diffuse across the base region into the B-C space charge region, where the electric field will sweep the electrons into the emitter. ■ Transistor Action 2.1.2 Biase