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The George Washington University School of Engineering and Applied Science Department of Electrical and Computer Engineering ECE 2110 - LAB...

DC Circuits: Operational Amplifiers and Applications

The George Washington University School of Engineering and Applied Science Department of Electrical and Computer Engineering ECE 2110 - LAB Experiment # 8 DC Circuits: Operational Amplifiers and Applications EQUIPMENT: Lab Equipment Equipment Description Digital Multimeter (DMM) Keithley Model 175 Digital Multimeter (DMM) Test Leads Banana to mini-grabber test leads Breadboard Prototype Bread Board DC Power Supply Agilent E3631A Triple Output DC Power Supply Table 1.1 COMPONENTS : Kit Part # Spice Part Name Part Description Symbol Name (used in schematics throughout this lab manual) LM741 uA741 LM741 Operational Amplifier uA741 Resistors R Resistor R Table 1.2 OBJECTIVES : Verify Ideal Model Op-Amp Characteristics Design, build and test a DC Inverting Amplifier Design, build and test a DC Non-Inverting Amplifier Design, build and test a DC Summing Amplifier Design, build and test a DC Difference amplifier Design, build and test a Buffer (Current amplifier) Design, build and test a Comparator GWU SEAS ECE Department ©2012 Page 1 of 11 ECE 2110 – Experiment: DC Circuits: Operational Amplifiers and Applications
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PRELAB: (Submit electronically prior to lab meeting, also have a printed copy for yourself during lab) Introduction Operational Amplifiers “Op-Amps” are important building blocks for a wide range of electronic circuits. They are among the most widely used electronic devices today with usage in a vast array of consumer, industrial, and scientific devices. The term ‘operational’ is used because they can perform all the basic arithmetic operations (addition - summing, subtraction – difference, multiplication, and division). In this lab we will examine the characteristics of an ideal Op-Amp, build fundamental DC Operational Amplifier Feedback Circuits and see the effects of the Op-Amps on the output of those circuits. Operational Amplifier Physical Details: The circuit symbol for an Op-Amp is shown on the right in Fig. P.1 where: V P : Non-Inverting Input V N : Inverting Input V out : Output Voltage V CC+ : Positive Power Supply V CC- : Negative Power Supply For this lab, you will use the Op-Amp called “LM741”, which is included in your ECE11 toolkit. LM741 series are general purpose Op-Amps intended for a wide range of applications and provide superior performance in general feedback circuits. A picture of the LM741 and its internal connection diagram are shown in Fig. P.2 and Fig. P.3, respectively. If you examine your LM741 Op-Amp, you will find a notch/dot in one of the corners. The notch/dot is located right next to Pin 1, thus it is used as a marking to identify the orientation of the Op-Amp. There are a total of 8 pins within the LM741. Table P.1 shows several fundamental feedback Op-Amp circuits including: DC Inverting Amplifier, DC Non-Inverting Amplifier, Summing Amplifier, Difference Amplifier, Buffer and Comparator.
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