# Assignment 3

# Practical Op-Amps – Understanding Op Amp Parameters

- Search the Internet for a LM741 datasheet. texas Instruments can be a good source.
- Answer the following questions:
- Given a signal with a peak voltage of 10V and a frequency of 2kHz, calculate the SR for Figure A.4, pg. 212.
- Given a total noise voltage of ent = 1mV, current noise In = 2pA/sqrt(Hz), and a source resistance Rs = 2kohms, calculate the voltage noise, Vn parameter. Requires solving for Vn in equation (A.3), pg. 207.
- Given that the maximum frequency without distortion fmax is defined as fmax = SR/2πVp, calculate SR with fmax = 3kHz, and Vpp = 15.
- Review the “LM741 datasheet” in your course materials and provide the following information:
- Supply voltage range
- Input Offset Voltage (typical) and (max)
- Large Signal Voltage Gain (min) and (typical)
- CMRR (typical)
- SVRR (typical)
- SR (typical)
- How many BJT’s comprise the internal circuitry?

- Scan all work and save it for upload with the title: “HW3_StudentID”, with your student id substituted in the file name. Show all work for full credit.
- Upload file “HW3_StudentID”

**Lab 3**

# Practical Op-Amps – Understanding Op Amp Parameters

The purpose of this lab is to use Multisim to determine the slew rate of an op-amp using a virtual oscilloscope. Students will compare typical values of slew rate obtained from a data sheet to those measured in Multisim. An understanding of how to measure this practical limitation of op-amps will provide insight in how to choose the appropriate op-amp for a given application.

- Watch video Week 3 – Op-Amp Slew Rate.
- Construct an Op-Amp configuration presented in the video in Multisim.
- Use the datasheet of the Op-Amps to find the slew rate and then use the Oscilloscope to measure the slew rate.
- Use the Op-Amps given in the table to repeat step 3 and complete the table.

Op-Amp | Slew rate from Datasheet | Measured Slew rate from simulation |

LM741 | ||

LM324 | ||

LM318 | ||

LM307 | ||

LM2904 | ||

LM224 |

- Take the screen shots of the Vout for slew rate measurements for each of the above Op-Amps.
- Answer the following questions:
- What is a slew rate and explain how it helps in determining the type of Op-Amp for applications.
- How do you measure slew rate given the input and output voltage of an Op-Amp? What are the tools used to measure the slew rate?
- Does the measured values of the slew rate match the values from datasheet? If not, explain why they are different?
- Explain the differences between the slewing phenomenon.

- Create a new word document called “Lab3_StudentID.docx” with your GID substituted into the file name.
- Verify all calculations from analysis and measurements from simulation. Save the results along with the table and paste the screen captures in the word document. Make sure to answer the questions.
- Upload file “Lab3_StudentID” in Blackboard.

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