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所在平台: Udemy |
课程主页: https://www.udemy.com/course/microelectronics-bipolar-cascode-amplifier/
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课程名称：微电子 - 双极级联放大器 课程概述：本音频课程《微电子 - 双极级联放大器》深入探讨了模拟电路设计中最基本且强大的放大器配置之一——双极级联放大器。双极级联放大器在高增益应用中起着至关重要的作用，因其具有高输出电阻和增强的输入输出阶段隔离性。该课程面向寻求深入理解双极结晶体管（BJT）电路级联结构的学生和专业人士。 课程首先介绍双极级联放大器的基本结构，将配置细分为其组成阶段，通常是共发射极阶段后接共基极阶段。这种模块化的分解为学习者打下了坚实的概念基础，以便在深入电路细节之前更好地理解其结构。 接下来，课程详细研究直流工作状态，关注正确的偏置技术和工作点确定，以确保两个晶体管在活动区域内工作。强调如何通过电流引导和电压水平约束塑造级联放大的静态行为。 然后，课程指导学生进行全面的交流小信号分析，探讨级联拓扑如何显著改善增益和输出阻抗等性能指标。我们推导出电压增益、输入电阻和输出电阻的表达式，特别关注共基极阶段在提高输出电阻和抑制米勒电容方面的作用，这对带宽增强至关重要。 最后，课程扩展至具有主动负载的级联放大器，将电阻性负载替换为电流镜结构。这种替换使得集成电路实现更高增益和更好的性能。学习者将理解级联阶段和主动负载之间的相互作用如何导致高效的模拟构建块，这些构建块通常用于运算放大器和射频前端。 在整个课程中，概念通过实际实例、逐步推导和问题解决策略得到巩固。不论是作为学习双极模拟电路的本科生，还是作为复习关键概念的在职工程师，该课程都将为学生提供掌握双极级联放大器所需的理论深度和实际见解。课程结束时，学生将对级联放大器的理论和实践设计有扎实的理解，为更高级的模拟和射频电路设计主题做好准备。
This audio course is entitled Microelectronics - Bipolar Cascode Amplifier. The course provides an in-depth audio course designed to unravel one of the most fundamental and powerful amplifier configurations in analog circuit design. The bipolar cascode amplifier plays a vital role in high-gain applications due to its high output resistance, and enhanced isolation between input and output stages. This course is tailored for students and professionals seeking a deep and intuitive understanding of the cascode structure in bipolar junction transistor (BJT) circuits.We begin with the fundamental structure of the bipolar cascode amplifier, carefully dissecting the configuration into its constituent stages-typically a common-emitter stage followed by a common-base stage. This modular breakdown builds a strong conceptual foundation for learners before diving into circuit-level nuances.The DC operation is then examined in detail, focusing on proper biasing techniques and operating point determination to ensure both transistors function in the active region. Emphasis is placed on understanding how current steering and voltage level constraints shape the static behavior of the cascode.Next, the course guides students through a thorough AC small-signal analysis, where we investigate how the cascode topology drastically improves performance metrics such as gain and output impedance. We derive expressions for voltage gain, input resistance, and output resistance, giving special attention to the role of the common-base stage in boosting output resistance and suppressing Miller capacitance, a key to bandwidth enhancement.Finally, the course extends into the cascode amplifier with an active load, replacing resistive loads with current mirror structures. This substitution enables higher gain and better performance in integrated circuit implementations. Learners will understand how the interplay between cascode stages and active loads leads to highly efficient analog building blocks, commonly found in operational amplifiers and RF front-ends.Throughout the course, concepts are reinforced with real-world examples, step-by-step derivations, and problem-solving strategies. Whether the course participants are undergraduate students learning bipolar analog circuits or a practicing engineer refreshing key concepts, this course will equip students with the theoretical depth and practical insight needed to master the bipolar cascode amplifier. By the end of this course, students will gain a solid grasp of both the theoretical and practical design aspects of cascode amplifiers, preparing them for more advanced topics in analog and RF circuit design.
