lab 5 ee97

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San Jose State University *

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97

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Electrical Engineering

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Apr 3, 2024

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1 Lab 5 EE97 Spring 2024 Thursday 1.30 - 4.15 PM Lab 5: Inverter and RC circuits Samal Maleesha Wijendra Partner: John Wu Submission Date: 03/01/24
2 Lab 5 Learning objectives This lab is to further familiarize students with the usage of oscilloscopes. After completing this lab, students should be able to measure the time delay of an inverter and the time constant of an RC circuit, use the math function of the scope. use both probes without unintentionally causing a short by the scope probes. Experiment 1 Understand the wave forms through a MOSFET with AC current and understand the real life situation of a square wave with different frequencies. Part 1: R = 326Ω Figure 1 Create circuit using Figure 1
3 Lab 5 Part 2: Setup the signal generator with 0-5V square wave and 1KHz Figure 2 Power source with 5v Part 3: Show up both Vin and Vout in oscilloscope at the same time. Need photo of the setup and the oscilloscope screen Figure 3 Oscilloscope screen with Vin and Vout (1KHz)
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4 Lab 5 Part 4: Increase the frequency to 100KHz Figure 4 Oscilloscope screen with Vin and Vout (100KHz)
5 Lab 5 Part 5: Results: Falling edge delay time 500ns Pictures Figure 5 Falling edge delay time calculation using oscilloscope Rising edge delay time 332ns Pictures Figure 6 Rising edge delay time calculation using oscilloscope
6 Lab 5 Experiment 2 Part 1: Create the circuit. C=0.01µF (marking: 103) and R=10k Ω. Measure R: 9.88kΩ Measure C:0.0095µF Calculate the time constant: Time constant = 9.88kΩ * 0.0095µF = 0.09386ms Part 2: Connect the function generator as the input of the circuit and square wave, 5v peak-to-peak voltage, 2.5v Offset, and set the frequency so that its period is 10 times the time constant of the RC circuit. Frequency calculation for the function generator: F = (1/0.09386ms) *10 = 10654.166kHz
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7 Lab 5 Part 3: Photos of the screen of the oscilloscope both Vin and Vout: Figure 7 Vin and Vout in Oscilloscope for fig 4 Measure the time constant using the oscilloscope Up = 86µs Down = 90µs 63% volatge = 5V*63% = 3.15V 37% voltage = 5V*37% = 1.85V Figure 8 Calculation of time constant in Up position
8 Lab 5 Figure 9 Calculation of time constant un down position Part 4: Change the frequency of the function generator so that it matches the time constant of the RC circuit. Measure the V pp-ripple voltage = 1.36V Time constant from the calculated value from step 1: Because of that we should set the frequency to 1065.417Hz Photo of oscilloscope
9 Lab 5 Figure 10 Vout ripple voltage calcuation using oscilloscope Part 5: Repeat the part 3 but change the frequency is 1/20 of the time constant. ( turn on the AC coupling option on the scope. This allows you to isolate the AC (i.e., the time-varying) part of the signal from the DC offset and zoom in on the AC part.) Frequency needed = 1065.417Hz*20 = 213083.316Hz Measure the V pp-ripple voltage = 86mV Photo of oscilloscope Figure 11 Vout Ripple voltage calculation using oscilloscope (213083Hz frequency)
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10 Lab 5 Experiment 3 Part1: Use the same circuit from previous experiment. ( set the square wave frequency so that its period is 10 times the time constant of the RC circuit) Period of the function generator : 0.9386ms Part 2: Vc value ( place probe in position B in Figure 8) Photo Figure 12 Oscilloscope screen with probes in B position
11 Lab 5 Part 3: Connection of probe over the resistor ( position C in Figure 8.) while keeping the last one Photo Figure 13 Oscilloscope screen of both probes in B & C positions Why the waveform of v c (t) is affected when this connection is made? Because the alligator clips are connected internally inside the oscilloscope, and it shorts the circuit. In that case current flow to the ground rather than going through the capacitor. Due to that circuit becomes unstable. Part 4: Remove the probe from position B and keep position C and observe what happens. Explain the waveform? Since when we connect the probes across the resistor it becomes shorted since alligator clips are interconnected inside the oscilloscope with ground and due to that capacitor becomes not part of the circuit itself. So that’s why we cannot see the wave that we are expecting. Does the observed resistor voltage ( V R (t)) waveform match the waveform of V in (t) - v c (t) ? No
12 Lab 5 Figure 14 Vin and Vresistor waves in oscilloscope Part 5: Use the math function to find Vr(t) Connect the probes in position A and position B (Make sure that both channels are set to the same vertical scale and that the zero volt references are lined up) Figure 15 Vin, Vc and calculated wave using oscilloscope
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