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所在平台: Udemy |
课程主页: https://www.udemy.com/course/operational-amplifier/
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**课程名称：** 运算放大器 - 从入门到进阶 **课程概述：** 本课程全面深入地介绍了运算放大器（Op-amp），将其定位为现代电子模块和系统中不可或缺的构建模块。课程从基础概念入手，逐步深入到运算放大器的原理、等效模型，以及其理想与实际特性，如开环/闭环增益（共模和差模）、带宽、输入/输出电阻等。 随后，课程重点讲解了虚短概念、负反馈机制，以及两种最常用的运算放大器配置：同相放大器和反相放大器。此外，还介绍了如何利用运算放大器实现电流-电压转换器。 进阶部分，课程将运算放大器应用于加法电路（加权求和放大器），并再次强调负反馈在其中扮演的重要角色。同时，课程还将讲解电压跟随器（缓冲器）的应用，特别是在阻抗不匹配场景下的作用，并通过实例指导学员设计具有特定增益的电路。 课程进一步深入探讨了运算放大器作为差分放大器的本质，推导了同相和反相模式下的闭环增益表达式，并分析了差分放大器的优缺点。在此基础上，课程引入了更为先进的仪表放大器（IA），阐述了其工作原理，以及如何提供更高的差分输入电阻和抑制共模信号，这对于设计高增益放大器电路至关重要。 课程的后半部分着重于运算放大器在有源滤波器设计中的应用。学员将学习如何设计有源积分器和微分器，推导其频率响应表达式（增益和相位随频率的变化），并了解如何配置成低通和高通滤波器。 尤为重要的是，本课程引入了电路仿真软件LTSPICE，指导学员完成有源滤波电路的设计、仿真与分析。课程还包括了有源带通滤波器的设计实例，从选择元件值、设计到仿真和结果分析，并将仿真结果与理论分析进行对比。整个过程展示了如何进行理论分析、选择元件、设计电路、仿真获取响应，并将实际结果与理论充分匹配。
New topics added: Operational amplifiers are the mostly used building blocks in the design and development of today's discrete and integrated electronic modules and systems. Op-amps are useful in designing and implementing many useful functions to perform a wide range of mathematical and logical operations. Primarily, op-amps are used to build high precision amplifiers, filters, and timing circuits. In this short modular course, we learn the fundamentals of op-amps, starting with the basic concepts and understand the principle of operation of op-amps. We learn about the op-amp equivalent model, ideal and practical properties of the op-amps such as open and closed loop gain (coomon-mode and differential), bandwidth, input and output resistance, etc. This is then followed by understanding the concept of virtual short, negative feedback and two most useful op-amp configurations, i.e. inverting and non-inverting amplifiers. We also understand how an op-amp can be used to convert input current into an output voltage (current-to-voltage converter).This course then takes forward the learners to understand how an op-amp can be configured into a weighted summing amplifier (adder). This is explained in lecture 5, and in the same lecture, we understand the important role of negative feedback in the opamp. We then learn about op-amps used as a voltage follower (buffer). This circuit has an application when there is the impedance imbalance between the high impedance source and the low impedance load. We also design a circuit for a specific gain as explained by the example given.Op-amp is essentially a difference amplifier and we understand and derive an expression of its closed-loop gain for both inverting and non-inverting modes. We understand the merits and few demerits of difference amplifiers and therefore we then introduce another popular circuit, called as Instrumentation Amplifier (IA). We explain the operation of IA and explain how IA offers improved differential input resistance and also helps to reject common-mode signals, the two most important parameters while designing an amplifier circuit with high gain.As the course moves ahead, we introduce a few important building blocks of op-amps, i.e. active filters. We explain an active filter (integrator) using an operational amplifier, derive expressions to obtain its frequency response ( how gain and phase varies as a function of frequency). We then learn about active filters (differentiator) using operational amplifiers. Both inverting and non-inverting circuit modes are explained to design low-pass and high-pass filters. Most importantly, the course introduces LTSPICE (a circuit simulation program) to design, simulate and analyse the response for a given values of a circuit components used in the filter circuits. The course then moves forward to explain how to design an active bandpass filter circuit. We choose component values, design and simulate the circuit and obtain the output response. The simulation results are analysed and compared with the theoretical analysis in the course. It is shown how to theoretically analyze the circuit response, choose component values, design the circuit, simulate, obtain its responses and compare the results to match with theory.
