运放带宽实验

●你好，欢迎来到TI Precision Labs（德州仪器高精度实验室）的运放带宽实验环节。

●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视频中的概念

加深理解。

●Hello,and welcome to the TI Precision Lab supplement for op amp bandwidth.

●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 bandwidth video series.

●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±15V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,Bode plotter,and±15V 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.

●首先，根据带宽课程中所学，计算这里所展示电路的闭环带宽和直流增益。运放的参

数在下一页中给出。

●First,calculate the closed loop bandwidth and DC signal gain for the circuit shown

here,using the techniques and equations given in the bandwidth e the data sheet parameters given on the next slide.

●该电路选用OPA171。为了完成计算，你要了解运放的增益带宽积和压摆率。表中给

出了这些参数。

●将答案填到中间的表格中，并仿真出电路的交流传递函数。

●我们在这里给出了答案，方便你验证结果。

●This circuit uses the OPA171.In order to perform the calculations,you need to know

the gain bandwidth product and slew rate for that device.That value is 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 complete the AC transfer function for this circuit.Again,the solution is already

provided.