PHYS 30501 - PHYS 3050 Lab Report IV Introduction to Diodes...

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PHYS 3050 Lab Report IV Introduction to Diodes Swapnil Agrawal 210049237 19th November 2009
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Swapnil Agrawal 210049237 Lab Report IV 1 Table of Contents 1. Introduction .................................................................................. 2 a. Background b. Aim c. Apparatus 2. Analysis, Observations and Calculations ........................................ 3 4.1 Testing the Diode ................................................................................... 3 4.2 Reverse-biased Diode Current ................................................................ 3 4.3 Forward-biased Diode Current ............................................................... 5 4.4 Germanium and Zener Diodes ................................................................ 6 4.5 Diode Characteristics .............................................................................. 10 4.6 The Light Emitting Diode (LED) ............................................................... 11 3. Sources of Error ............................................................................ 14 4. Conclusion .................................................................................... 14 5. References .................................................................................... 14
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Swapnil Agrawal 210049237 Lab Report IV 2 INTRODUCTION 1. Background In electronics, a diode is an electronic device that restricts current flow chiefly to one direction. The term usually refers to a semiconductor diode, the most common type today, which is a crystal of semiconductor connected to two electrical terminals, a P-N junction. The most common function of a diode is to allow an electric current in one direction (called the forward direction) while blocking current in the opposite direction (the reverse direction). Thus, the diode can be thought of as an electronic version of a check valve. This unidirectional behaviour is called rectification, and is used to convert alternating current to direct current, and remove modulation from radio signals in radio receivers. LEDs are PN junction devices that radiate energy primarily as light instead of as heat. 2. AIM The purpose of this experiment is for us to become familiar with the operating characteristics of the diode. 3. APPARATUS a) Agilent 33120A function/Arbitrary Waveform Generator b) Agilent 3630A Triple Output DC Power Supply c) Tektronix TDS200 Digital Storage Oscilloscope (DSO) d) Breadboard, Resistors and Diodes
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Swapnil Agrawal 210049237 Lab Report IV 3 ANALYSIS, OBSERVATIONS and CALCULATIONS 4.1 Testing the Diode We had 3 available diodes and using the DMM we tested out whether the diode was good or not. The DMM was put in diode measure mode and was measured across the diode. The following values were observed on measurement: 1. Si diode = 0.597 V 2. Ge diode = 0.28 V 3. Zener Diode = 0.7 V Diode Silicon Germanium Zener Measured Value 0.597 V
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