# Lab 6: Instrumentation Amplifier

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ECE 445 Biomedical Instrumentationrev 2012Figure 2: Opamp modeled as a voltage controlled voltage source.Part 3: Resistor Color CodesThe figure below shows how color bands are used to show the value of the discrete resistorcomponent. Notice that color-coded resistors are therefore only available in a few discrete values.When choosing values for your amplifier circuit, the absolute value is often not as important as the ratioof values, so the limited resistances available are generally sufficient.Figure 3: Resistor color codes. For this course we use resistors with only 2 value color bands, asillustrated at the top of the figure (ignore the 3rd Band column).LABORATORY PROCEDURE:Message from the instructor: Before beginning this lab, we want you to understand that, in thissenior elective course, we expect you to begin to show some level of independence. It would be ideal ifthis lab assignment simply said, “Construct the circuit you designed in the prelab and test it to verifyfunctionality,” but we realize that most of you need more practical experience with building and testingcircuits before we can do this. So, we’ve tried to provide a step-by-step assignment guide to walk youthrough. That said, we’d like to know you have the ability to notice when things are not going asexpected, and can access your toolbox of skills to both track down what is not working right and alsofind a way to fix it. To that end, do not get frustrated if the steps in this lab don’t work out exactly asthey are presented. Rather, use your knowledge and skills to identify the problem and fix it. You’ll findthat’s a great step toward becoming an effective engineer. The real world is not a fixed set of problemswith known solutions; debugging is an everyday way of life. To help you experience this, some of thesteps in this assignment are intentionally vague or may require taking actions not specifically defined.Lab 6, Page 3

Lab 6: Instrumentation Amplifier . INTRODUCTION: A fundamental building block for electrical measurements of biological signals is an instrumentation amplifier. In this lab, you will explore the operation of instrumentation amplifiers by designing, building, and characterizing the most basic instrumentation amplifier structure.

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