ee348_Experiment03 - Laboratory Experiment 3 EE348L...

Info icon This preview shows pages 1–5. Sign up to view the full content.

University of Southern California. EE348L page1 Lab 3 Laboratory Experiment 3 EE348L B.Madhavan Revised by: Aaron Curry
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

University of Southern California. EE348L page2 Lab 3 Table of Contents 3 Experiment #3: OP-AMP THEORY & APPLICATIONS ..................................... 4 3.1 Introduction: .............................................................................................................................. 4 3.2 Ideal Op-Amp Basics: ............................................................................................................... 4 3.3 Comparator: ................................................................................................................................ 5 3.4 Feedback: .................................................................................................................................. 6 3.5 Op-Amp Characteristics: ............................................................................................................ 8 3.5.1 Slew Rate: ..................................................................................................................... 8 3.5.2 Bandwidth: .................................................................................................................... 9 3.5.3 Offset Voltage: ............................................................................................................... 9 3.6 Op-Amp Review ......................................................................................................................... 9 3.7 Theory of Active Filters: ............................................................................................................. 9 3.7.1 Second-Order low-pass filter: ..................................................................................... 11 3.7.2 Second-Order high-pass filter: .................................................................................... 14 37.3 Second-Order band-pass filter: ................................................................................... 16 3.8 References ............................................................................................................................... 21 3.9 Schematic diagram of a 741 op-amp: ...................................................................................... 21 3.10 LM741 SPICE Model………… ... ……………………………..……… . ………… . …………2 2 3.11 Pre-lab exercise ........................................................................................................................ 25 3.12 Lab Exercises ........................................................................................................................... 29
Image of page 2
University of Southern California. EE348L page3 Lab 3 Table of Figures Figure 3-1: (a) VCVS conceptual representation of op-amp, (b) schematic representation. ................. 5 Figure 3-2: Behavior of op-amp output voltage, assuming power supply = ± 12V ............................... 5 Figure 3-3: Basic op-amp comparator. ............................................................................................... 6 Figure 3-4: Op-amp without feedback ……………………… . ........................................................... …. 7 Figure 3-5: Op-amp with feedback: ................................................................................................... 7 Figure 3-6: Graph of an ideal low pass, band-pass, and high-pass filter output ............................... 10 Figure 3-7: Graph of a typical low-pass, band-pass, and high-pass filter output. ………….. ............ 11 Figure 3-8: Low-pass Sallen and Key filter. ..................................................................................... 13 Figure 3-9: A graphed output of the low-pass Sallen and Key filter .................................................. 14 Figure 3-10: High-pass Sallen and Key filter. .................................................................................. 15 Figure 3-11: A graphed output of the high-pass Sallen and Key filter. ............................................ 16 Figure 3-12: Band-pass Sallen and Key filter .................................................................................. 17 Figure 3-13: A graphed output of the band-pass Sallen and Key filter. ........................................... 18 Figure 3-14: A schematic diagram of a cascade band pass filter. ................................................... 19 Figure 3-15: The typical response of a band-pass filter ……………….. ........................................... 20 Figure 3-16: Schematic diagram of a 741 op-amp.. ........................................................................... 21 Figure 3-17: Figure for pre-lab problem 1 ......................................................................................... 25 Figure 3-18: Figure for pre-lab problem 2 ......................................................................................... 26 Figure 3-19: Figure for pre-lab problem 4 ......................................................................................... 26 Figure 3-20: Figure for pre-lab problem 5 .......................................................................................... 27 Figure 3-21: Figure for pre-lab problem 6 .......................................................................................... 28
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

University of Southern California. EE348L page4 Lab 3 3 Experiment #3: Op-Amp Theory & Applications with Filters 3.1 Introduction: Operational amplifiers (op-amps for short) are incredibly useful devices that can be used to construct a multitude of electronic circuits. They are particularly attractive in both amplifier design and academic instruction because, more often than not, they can be treated as ideal amplifiers. An ideal op-amp has four basic characteristics; infinite gain, infinite bandwidth, infinite input impedance and zero output impedance. An ideal op-amp draws no power from the input due to the infinite input impedance. While the inherent low output impedance enables the op-amp to establish an output that is independent of the circuitry loading. While no amplifier is in fact ideal, the clarity and insight afforded by the assumption of ideal behavior makes the op-amp an attractive first step in designing any amplifier, even those that do not in fact exploit op-amps (e.g., other transistor amplifiers, which we will consider in later labs).
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '06
  • Maby
  • Operational Amplifier, ........., High-pass filter, Band-pass filter, Low-pass filter, University of Southern California

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern