Berk - 1 Introduction The purpose of this experiment was to...

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1. Introduction: The purpose of this experiment was to understand the i-v characteristic curve of different types of diodes. In order to achieve this, first the forward and reverse resistance of different types of diodes was determined by using Keithley Model 175. Then the current flow was tested on a test circuit to get the saturation current values and also the voltage drop values were obtained by changing the values of the current source to see the have a precise idea about the i-v characteristic of the diode. 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]
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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 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 best way to explain the experimental procedures is to divide it into four parts just as it was done in lab manual. In this part of the lab, it was asked to measure and record the forward and the reverse direction resistances of the 4 diodes referred in Table 1 by using the Keithley Multimeter 175. Also it was asked to calculate the ratio (R r /R f ) for each diode. Lastly for this part it was asked to carry out a diode test by using Keithley Multimeter 175, which required to press voltage and 2k and 200k push buttons at the same time and the display was supposed to show the V f drop of the diode at 0.7 volts. Part4.2: Reverse Saturation Current In this part, it was asked to construct 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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Berk - 1 Introduction The purpose of this experiment was to...

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