EEE 118 1s2324 Module 2 Answer Sheet (1) PDF

University of the Philippines EEE 118 1s2324 MODULE 2: ANSWER SHEET Submitted by: Student Number: Section: General Instructions Provide the required information in the spaces provided. If you run out of room for your answers...

University of the Philippines EEE 118 1s2324 MODULE 2: ANSWER SHEET Submitted by: Student Number: Section: General Instructions Provide the required information in the spaces provided. If you run out of room for your answers, feel free to adjust the template as necessary. Submission Policy Submit this answer sheet in PDF format. Follow the filename eee118_labX_studentnumber, e.g. eee118_lab1_202198765.pdf Commponents List: 1.8k resistor (1 pc) 1.8k resistor (1 pc) 68k resistor (2 pcs) 680pF capacitor (1 pc) Learning Activities 1: Simulation Simulation Activity 1: DC Operating Point 1 Draw the voltage divider circuit in Figure 26. Use the following values: R1=68k, R2=33k, V1=5V. 1. Without using LTSpice, compute the theoretical values for the voltages across, currents through, and power dissipated by 𝑅1 and 𝑅2. Show your solution and fill up the table below. Theoretical Values Component Voltage Current Power R1 R2 Solution Page 1 University of the Philippines EEE 118 1s2324 2. Simulate the circuit in LTSpice. What are voltages across, currents through, and power dissipated by 𝑅1 and 𝑅2 ? Include a screenshot of the circuit used and your output window from LTSpice showing all voltages and currents in that operating point. Make sure you have labeled all your nodes properly such that they are identifiable with the output screenshot. Circuit Screenshot Output Screenshot Simulation Values Component Voltage Current Power R1 R2 Page 2 University of the Philippines EEE 118 1s2324 3. Add another resistor R3 parallel to R2 (see Figure 27), compute the theoretical values for the voltages across, currents through, and power dissipated by R1, R2, and R3. Theoretical Values Component Voltage Current Power R1 R2 R3 4. Simulate the circuit in LTSpice. What are voltages across, currents through, and power dissipated by 𝑅1 , 𝑅2 and 𝑅3 ? Include a screenshot of the circuit used and your output window from LTSpice showing all voltages and currents in that operating point. Make sure you have labeled all your nodes properly such that they are identifiable with the output screenshot. Circuit Screenshot Output Screenshot Simulation Values Component Voltage Current Power R1 R2 R3 5. Compare the theoretical values and the simulation values. Are they similar or different? Why or why not? Page 3 University of the Philippines EEE 118 1s2324 Simulation Activity 2: DC Operating Point 2 1. Draw the circuit in Figure 28 in LTSpice. Make sure you have the correct node names. 2. Simulate the circuit in LTSpice. Include a screenshot of the circuit and the output window in LTSpice. Circuit Screenshot Output Screenshot Page 4 University of the Philippines EEE 118 1s2324 Component Voltage Current Power Voltage Source R1 R2 R3 R4 R5 R6 Simulation Activity 3: Transient Analysis 1. Draw the RC circuit shown in Figure 29. For the voltage source V1, use a 0-5V square wave with frequency of 1kHz. 2. Plot the following waveforms. Input Voltage V1 Page 5 University of the Philippines EEE 118 1s2324 Voltage across R1 Voltage Across C1 Simulation Activity 4: More Complex Circuits Practice your LTSpice drawing and simulation with more complicated circuits. Make sure you use the correct components including the model for the diodes and op-amps. Note: Use transient simulation. Change the simulation settings (including stop time) such that the waveforms are clearly seen. Zoom in or out when necessary. 1. Draw the Cascade of Diode Circuits below. For the simulation settings, use ".tran 20m". Show the voltage waveforms of V1, Vclamp, Vrec, and Vsmooth. Put the screenshots of the waveforms in your answer sheet. Page 6 University of the Philippines EEE 118 1s2324 Circuit V1 Vclamp Vrec Vsmooth Page 7 University of the Philippines EEE 118 1s2324 2. Draw this non-inverting summing op-amp circuit. Use the same values shown below. For V1, use a sine function with amplitude of 2 and frequency of 500Hz. For V2, use a pulse function with amplitude of 2, $T_{rise}$ and $T_{fall}$ of 1n, Ton of 0.5m, and period of 1m. Set the stop time of your simulation such that it shows at least 5 cycles. Show the waveforms of V1, V2, and Vout. Put the screenshots of the waveforms in your answer sheet. Circuit V1 Page 8 University of the Philippines EEE 118 1s2324 V2 Vout Describe what is happening in this circuit. What happens to Vout with respect to V1 and V2? Learning Activities 2: Hardware Hardware Activity 1: Constant Current and Constant Voltage 1. Before you connect the circuit, set the power supply voltage to 3V and the power supply current to 3mA. 2. Calculate the following: Computed Value Current going to the resistor when the power supply acts like a voltage source. Use the given voltage to compute the current. Page 9 University of the Philippines EEE 118 1s2324 Voltage across the resistor when the power supply acts like a current source. Use the given current to compute the voltage. 3. Connect the power supply with the setting defined to the circuit. Measure the voltage and current of the resistor. Measured Value Voltage of R1 Current through R1 Comparing the actual measurements and the calculations in Exercise 3, what is the function of the power supply? 4. Now, we try configure the power supply with another setting. Remove the power supply and set the power supply voltage to 3V and the power supply current to 1mA. 5. Calculate the following: Computed Value Current going to the resistor when the power supply acts like a voltage source. Use the given voltage to compute the current. Voltage across the resistor when the power supply acts like a current source. Use the given current to compute the voltage. 6. Like earlier, connect the power supply with the setting defined to the circuit. Measure the voltage and current of the resistor. Measured Value Voltage of R1 Current through R1 Comparing the actual measurements and the calculations in Exercise 4, what is the function of the power supply? Page 10 University of the Philippines EEE 118 1s2324 Hardware Activity 2: Constant Current and Constant Voltage 1. Build the resistor circuit from Simulation Activity 2. 2. Measure and compute the following: Component Voltage Current Power V1 R1 R2 R3 R4 R5 R6 3. Compare the values you got here and the values from the simulation. Are there any discrepancies? Why or why not? Page 11 University of the Philippines EEE 118 1s2324 Hardware Activity 3: More Complex Circuits 1. Build the RC circuit from Simulation Activity 3. 2. Sketch or take a photo of the specified voltage waveforms by probing them with the oscilloscope. Show at least 2-3 cycles for all waveforms. Input Voltage V1 Voltage across R1 Voltage Across C1 Page 12 University of the Philippines EEE 118 1s2324 3. Compare the waveforms you got here and the ones from the simulation. Are there any discrepancies? Why or why not? Page 13