PHYS3050 Lab 4 - PHYS3050 Lab 4 Introduction to Diodes By...

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PHYS3050 Lab 4 Introduction to Diodes By: Aysar Khalid (209728866) Lab Partner: Hassan Chehaitli Submitted on: November 25 th , 2010
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Background In electronics, a diode is an electronic device that restricts current flow mainly 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). Objective The purpose of this experiment is for us to become familiar with the operating characteristics of the diode. Apparatus Item Description Tektronix TDS200 Digital Storage Oscilloscope (DSO) A digital oscilloscope that channels voltage in real-time. Agilent E3630A Triple Output DC Power Supply Provides a direct current power supply. Agilent 33120A Function/Arbitrary Waveform Generator A waveform/function generator. Breadboard, resistors, Silicon, Germanium and Zener diodes Procedure Please see the lab manual.
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4.1 Testing the Diode Using the DMM, we measured the voltage across the silicon diode to check if it is functional, 0.6095 V was measured- which is close to the expected value of 0.6 V. Hence, it was concluded that the diode was functional. 4.2 Reverse-biased Diode Circuit First we constructed the following circuit, using a resistor of magnitude 1 MOhm. This circuit is of a reverse-biased diode. This allows us to measure the diode reverse current and the voltage across the diode. We measured for a range of bias voltages from 0 V to 40 V by multiples of 5; this was to ensure we cover most of the value ranges at an efficient rate.
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