运算放大器：输入和输出限制 - 实验

●你好，欢迎来到TI Precision Labs（德州仪器高精度实验室），输入输出限制的实验

环节。

●这个实验会包括计算，SPICE仿真和实际测试。这些环节会帮助大家对输入输出摆幅

限制视频中的概念加深理解。

●Hello,and welcome to the TI Precision Lab supplement for op amp input and output

limitations.This lab will walk through detailed calculations,SPICE simulations,and real-world measurements that greatly help to reinforce the concepts established in the op amp input and output limitations lecture.

●本实验的计算过程是手工计算的，但也可以使用Mathcad或者Excel等工具。

●因为实验中的SPICE模型是德州仪器提供的通用的运放SPICE模型，所以仿真环节

可以使用任何SPICE仿真器。用TINA-TI实施这些仿真是最方便的。TINA是免费的SPICE仿真器，可以从TI的网站上下载。TINA仿真原理图会附在PPT中。

●最后，真实的测试会使用TI提供的印刷电路板。如果你有标准的实验设备，可以用示

波器，波形发生器，波特仪和±5V电源来进行测试。我们推荐使用国家仪器的虚拟仪器。这套虚拟仪器是一套多功能集成设备，可以通过USB或者WIFI与电脑连接。这台仪器提供电源，信号发生器，示波器和5位半的数字万用表，方便进行精确测试。

本章实验中使用的是这套仪器。

●The detailed calculation portion of this lab can be done by hand,but calculation tools

such as MathCAD or Excel can help greatly.

●The simulation exercises can be performed in any SPICE simulator,since Texas

Instruments provides generic SPICE models of the op amps used in this lab.

However,the simulations are most conveniently done in TINA-TI,which is a free SPICE simulator available from the Texas Instruments website.TINA simulation schematics are embedded in the presentation.

●Finally,the real-world measurements are made using a printed circuit board,or

PCB,provided by Texas Instruments.If you have access to standard lab equipment, you can make the necessary measurements with any oscilloscope,function

generator,and±5V power supply.However,we highly recommend the VirtualBench from National Instruments.The VirtualBench is an all-in-one test equipment solution which connects to a computer over USB or Wi-Fi and provides power supply rails, analog signal generator and oscilloscope channels,and a5½digit multimeter for convenient and accurate measurements.This lab is optimized for use with the

VirtualBench.

●在实验1中，我们将探讨在一个基本的电压跟随器，或者单增益缓冲电路中，输入输

出摆幅限制会有怎样的影响。

●In experiment1,we’ll determine the effects of input and output limitations in a basic

voltage follower,or unity-gain buffer,circuit.

●首先，根据在输入输出摆幅限制课程中所学的公式，计算此电路的输入共模电压范围

和输出电压摆幅。在下一页中给出了计算所需的参数。

●First,calculate the input common mode voltage range and output voltage swing for

the circuit shown here,using the techniques and equations given in the input/output limitations e the data sheet parameters given on the next slide.

●此电路使用的是OPA140。为了进行计算，需要知道这个运放的输入电压范围和输出

电压摆幅值。这里给出了这些值。

●在表中填入你的答案，并回答底部所给出的问题。为了方便检验，我们也已在此处给

出了答案。

●This circuit uses the OPA140.In order to perform the calculations,you need to know

the input voltage range and voltage output swing values for that device.Those

values are given here.

●Enter your answers in the table in the middle of the slide.The solutions are already

provided to allow you to check your work.

●Also answer the question at the bottom of the slide.Again,the solution is already

provided.