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所在平台: Udemy |
课程主页: https://www.udemy.com/course/learn-bipolar-junction-transistor-bjt-from-basics/
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【课程总结】 本课程深入浅出地讲解了双极结型晶体管（BJT）的基础知识。从BJ T的基本构成、PN结的连接方式，到其作为开关和放大器的工作原理，学员将全面掌握BJ T的各项特性。 课程内容涵盖： * **BJT基础**： BJ T的物理结构、PNP和NPN两种类型，以及发射极（Emitter）、基极（Base）和集电极（Collector）这三个关键端子。 * **BJT工作区域**： 详细解析了 BJ T在主动区（作为放大器）、饱和区（作为全开开关）和截止区（作为全关开关）这三种工作模式的特性。 * **BJT偏置技术**： 介绍了固定偏置、集电极到基极偏置以及分压偏置等常用的 BJ T偏置方法，确保 BJ T能够稳定工作。 * **BJT放大器**： 深入探讨了共基（CB）、共射（CE）和共集（CC）放大器的电路结构和工作原理。 * **小信号模型**： 学习了 BJ T的混合参数（Hybrid model）小信号模型，用于分析电路的放大性能。 * **反馈放大器**： 讲解了反馈在放大器设计中的应用及其影响。 * **振荡器**： 学习了 RC和 LC振荡器的原理和实现。 * **多级放大器**： 探讨了如何将多个放大器级联以实现更高增益。 * **功率放大器**： 介绍了不同类型的功率放大器及其在功率输出方面的应用。 本课程旨在使学员理解 BJ T作为电子电路中“电流控制器”的核心作用，并能将其应用于实际的开关和放大电路设计中。
The Bipolar Junction Transistor is a semiconductor device which can be used for switching or amplificationThis Course deals with basics of BJT, BJT characteristic's, BJT biasing Techniques( Fixed bias, collector to Base bias and voltage divider bias), BJT amplifiers ( CB, CE, CC amplifiers), small signal model of BJT( Hybrid model ), Feedback amplifiers, Oscillators ( RC and LC ), Multistage amplifiers and Power amplifiers.If we now join together two individual signal diodes back-to-back, this will give us two PN-junctions connected together in series which would share a common Positve, (P) or Negative, (N) terminal. The fusion of these two diodes produces a three layer, two junction, three terminal device forming the basis of a Bipolar Junction Transistor, or BJT for short.Transistors are three terminal active devices made from different semiconductor materials that can act as either an insulator or a conductor by the application of a small signal voltage. The transistor's ability to change between these two states enables it to have two basic functions: "switching" (digital electronics) or "amplification" (analogue electronics). Then bipolar transistors have the ability to operate within three different regions:Active Region - the transistor operates as an amplifier and Ic = β*IbSaturation - the transistor is "Fully-ON" operating as a switch and Ic = I(saturation)Cut-off - the transistor is "Fully-OFF" operating as a switch and Ic = 0The word Transistor is a combination of the two words Transfer Varistor which describes their mode of operation way back in their early days of electronics development. There are two basic types of bipolar transistor construction, PNP and NPN, which basically describes the physical arrangement of the P-type and N-type semiconductor materials from which they are made.The Bipolar Transistor basic construction consists of two PN-junctions producing three connecting terminals with each terminal being given a name to identify it from the other two. These three terminals are known and labelled as the Emitter ( E ), the Base ( B ) and the Collector ( C ) respectively.Bipolar Transistors are current regulating devices that control the amount of current flowing through them from the Emitter to the Collector terminals in proportion to the amount of biasing voltage applied to their base terminal, thus acting like a current-controlled switch. As a small current flowing into the base terminal controls a much larger collector current forming the basis of transistor action.The principle of operation of the two transistor types PNP and NPN, is exactly the same the only difference being in their biasing and the polarity of the power supply for each type.
