模拟电子技术课程实践docx2.docxVIP

模拟电子技术课程实践班级：13—电本学号：201392170109姓名：李长林指导老师：崔用明2014年6月8日绪论1928年美国西部电子公司的Harold Black在长途电话中继放大器增益稳定的方法研究中，发明了反馈放大器。如今，反馈理论已被广泛应用与许多领域，如电子技术和控制科学、生物学、人类社会学等领域。在电子电路中，反馈的应用是极为普遍的。按照极性的不同，反馈分为正反馈和负反馈两种，他们在电子电路中所起的作用不同。在所有实用的放大电路中都要适当地引入负反馈，用以改善放大电路的性能指标。本次实践作业着重介绍电压串联负反馈的基本概念及反馈放大电路的基本类型，学习反馈放大电路的分析方法，然后分析负反馈对放大电路的影响，继而介绍电压串联负反放大电路的设计。关键词：运放、运算、负反馈、放大电路。英文：The introduction Electronics companies in the western United States in 1928 Harold Black in long distance telephone relay amplifier gain stable method study, invented the feedback amplifier. Now, the feedback theory has been widely used in many areas, such as electronic technology and control science, biology, human society Learning, etc. In electronic circuits, the application of feedback is a very common. According to the different polarity, feedback into positive feedback and negative feedback, they are different in electronic circuit, the role of. In all practical amplifying circuit should be properly introduced negative feedback, to improve the performance of the amplifier circuit. The practice operation series voltage negative feedback is introduced the basic concept and basic types of feedback amplifier circuit, learning feedback amplifier circuit analysis method, and then analyzed the influence of the negative feedback of amplifier circuit, and then introduces the design of voltage series negative reverse amplifier circuit.一设计题应用模拟电子技术所学知识，设计一个电压串联负反馈二级放大电路。设计步骤:框图（2）方法2.1静态工作点设置分析两极阻容耦合放大电路的总放大倍数为Au = Au1Au2 (2.1.1)其中，第一级放大电路的电压放大倍数为 Rcsβ1= ——— Ri2Au= - ———————— (2.1.2)Rbe1+(1+β1)+Re1可作为第一级放大电路的外接负载，第二级放大电路的输入电阻为Ri2=(R6+Rw)∥R7∥[rbe2+(1+β2)Re2] (2.1.3)设U=0.7V,所以第一级放大电路中 R2UBQ= ——————— Ucc=2.4V Rw+R1+R2 UB-UBEIEQ+——————≈Ic=1mA R4UCEQ=Ucc-Ic(R3+R4+R5)=10.2V (2.1.4) R3||RLAu=-β ————RbeRi=(RW+R1)||R2||rbeR0≈r3=1.8k所以晶体管V1和V2的输入电阻为 26Rbe1≈200+(1+β1)———— (2.1.5) IEQ1