Question

ECE 322L - Lab 2 Goal In this lab you will gain understanding of nmos transistor regions of operation, analyzing the IV characteristic curves, gain experience modeling using PSPICE, MultiSim, or your preferred simulation software, and verify your hand analysis of the circuit. Equipment needed ☐ Lab notebook, pencil ☐ Agilent Digital Multimeter AgilentVariable Power Supply ☐ ☐ BNC/EZ Hook test lead ☐ Banana Clips Parts needed ☐ Circuit breadboard ☐ ☐ ☐ ☐ Lab parts kit Transistor, N-MOS, BS170 Jumper wires Resistors: 1ΚΩ, 6.2ΚΩ, 0.5 ΚΩ Software needed ☐ PSpice or MultiSim The Lab H|| 3 V Rd 1ΚΩ BS170 R2 6.2ΚΩ Rs 50.5ΚΩ Fig1: Circuit Diagram Part 1 Perform hand analysis of the given circuit (Figure 1). Use the values K'n = 1.825 mA/v^2, (W/L) = 1 and VTN=1 in your hand calculations. What region of operation (Cut-off/Saturation/Linear) is the device in? Construct the circuit using BS170 NMOS transistor and given resistor values. Test the circuit at varying VDD and graph ID VS VDD. • Include a sketch of the load line in your report. • Simulate the circuit using your preferred software. Compare the results between your hand calculations, model, and measurements ○ Be sure to list IDQ, VDSQ, and VGSQ at the given VDD. О What could be the cause of differences in the three different measurements? Part 2 • How could we change the operating region of the transistor? Develop a hypothesis, and then perform hand calculations to verify it. Provide a circuit diagram of your modified circuit ○ Include your calculations for IDQ, VDSQ and VGSQ at a specific VDD. Plot the load line and Q-point for your chosen VDD. Extra Credit • Build the modified circuit, о Make sure the device parameters can handle the new currents and voltages. Test the circuits lÅ with varying VDD. Graph the results. Make a table comparing the measured values against the hand calculations for IDQ, VDSQ and VGSQ at a specific VDD. Note: Please only include the Pspice code you used, and applicable output values in your report. You do not need to copy the entire output file into your report. Make sure to include a circuit diagram with the nodes you used in your code labeled. For MultiSim, please provide screen captures of the measurements. Clean your lab space After you have finished the lab, put away all materials you were using in the proper places. Make sure the lab area is clean. Failure to follow proper lab etiquette will result in deductions on your lab report grade. Lab 2 Rubric Requirement: Part 1: a. Hand Calculations and Region of Operation (20 points) b. Graph of ID Vs. VDD (20 points) c. Load line and Q-point Sketch (15 points) d. Compare and explain difference hand/measured/simulated results (20 points) Part 2: a. Hypothesis and hand calculations (10 points) b. Quiescent Values (5 points) c. Load line with Q-point (10 points) Extra Credit a. Graph of ID Vs. VDD (5 points) between b. Table comparison of measured and hand calculations quiescent values (5 points) Possible Points (100) 75 25 10 extra

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