EECS 40 Spring 2005 Diodes and MOSFETs Joanna Lai, Kyeungsup Shin, Fall 2005 1 Name: Name: TA: Section: Diodes and MOSFETs: Lab Report Part One: Half-Wave Rectifier 2. Describe what method you used to measure the threshold voltage of the diode? What color LED did you use? ____________ What is the threshold voltage of the LED? ___________ V What is the threshold voltage if you make the input Vpp smaller? ________ V What is the threshold voltage if you use a negative offset? ____ V What is the threshold voltage if you make the input Vpp small (i.e. ~0.5 Vpp) and you increase the offset to 0.5 VDC? What do you see on the output? _______ V What is the threshold if you lower the frequency of the function generator? ________V What happens as you vary the resistance on the rheostat? ______ V Do different color LED’s have different threshold voltages? Red ______V, Yellow _____ V, Green ________V 3. What is the threshold of a silicon 1N914 or 1N4148 diode? Is it different from the LED? Part Two: Diode I-V characteristics using LABVIEW 5. How does LABVIEW compute the voltage across the diode? 6. From your graph, what is your computed Io value? ________ A Is this value what you expected?EECS 40 Spring 2005 Diodes and MOSFETs Joanna Lai, Kyeungsup Shin, Fall 2005 2Part Three: MOSFET I-V characteristics using LABVIEW 8. Describe what this LABVIEW program does: 9. Is the MOSFET a long or short channel
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