EECS 40 Spring 2005 Diodes and MOSFETs Joanna Lai Kyeungsup Shin Fall 2005 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 1 EECS 40 Spring 2005 Diodes and MOSFETs Joanna Lai Kyeungsup Shin Fall 2005 Part Three MOSFET I V characteristics using LABVIEW 8 Describe what this LABVIEW program does 9 Is the MOSFET a long or short channel device 2
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