Josh - 1 Introduction The main goal of this lab is to...

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1. Introduction: The main goal of this lab is to understand the i-v characteristic curve of different diodes. The forward and reverse resistance of different types of diodes was found by using Keithley Model 175. The current flow was then found on a testing circuit to get the saturation current values. By the same method, the voltage drop values were also obtained by changing the values of the current source to find the i-v characteristics. 2. Background information: V = I × R Equation Ohm's Law Equation I S = Saturation current V T = Thermal Voltage (25mV) I D = I S × ( e ( V D nV T ) - 1) Equation Diode Equation [1] Figure i-v Characteristic of Diode [1] 3. Methods and Materials: Equipment Agilent E3631A Triple Output DC Power Supply (1) Germanium Diode (1N34A), D1 Keithley Multimeter - Model 175 (1) Series Silicon Diode (1N4002), D2 Breadboard (1) Zener Diode (1N752A), VR1
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PSPICE (1) Gallium Arsenide Phosphide (GaAsP) Light Emitting Diode (LED) (MV5753), DS1 Tektronix Model 571 (1) 1 MΩ Resistor, R1 (1) 1 Ω Resistor, R2 Table 4. Experimental Procedures: The Keithley Multimeter 175 was used to measure and record the forward and the reverse direction resistances of the 4 diodes referred in Table 1. Also it was asked to calculate the ratio (R r /R f ) for each diode. The last step of this section was to carry out a diode test by using Keithley Multimeter 175, which required that the DMM voltage 2k and 200k buttons were pushed at the same time. This made the display show the V f drop of the diode at 0.7 volts. Part 4.2: Reverse Saturation Current This section called for the construction of a circuit that has a diode, resistor and a DC voltage source in order to measure the reverse saturation current (I S ) of diodes D2 and D1. Figure
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This note was uploaded on 11/14/2011 for the course ECE 2115 taught by Professor Ahm during the Fall '11 term at GWU.

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Josh - 1 Introduction The main goal of this lab is to...

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