Objectives: To study the characteristics of Zener diode. A graph of current through vs the voltage across the device is called the characteristic of Zener diode.The first quadrant is the forward biased region. Key terms related to Zener Diode. For each pn junction diode, there will be a maximum net current that it can withstand. Theory:-A Semiconductor diode is prepared by joining P and N sections of a semi conducting … The breakdown voltage of a Zener diode can be set by controlling the doping level. The other differences between the PN-junction and Zener diode are shown in the comparison chart. In general, the cathode of a diode is marked by a solid line on the diode.The You must also design a circuit that demonstrates the operation of a 7 V ± 5% loaded Zener regulator powered by a 12 V DC voltage source. b. 2. Difference Between PN Junction & Zener Diode The major difference between PN junction and the Zener diode is that the PN junction diode allows current to pass only in the forward direction, whereas the Zener diode allows the current to flow both in the forward and the reversed direction. M90005. Experiment no. The lead connected to the p-type material is called the anode and the lead connected to the n-type material is the cathode. This post includes explanation of operation of Zener diode and V-I Characteristics of Zener Diode. Lab Report Zener Diode Solved: EEE 2416 ELECTRONICS EXPERIMENT 1 DIODE APPLICATIO … – Science report for no cost for you. Abstract: 1N755A zener 5V conclusion dc zener diode conclusion of zener diode voltage Text: Filter Conclusion A 7.5V zener diode connected from the DC supply terminal of an MNA amplifier to , oscilloscope traces show that the zener diode clamps Point B to a voltage in the range 7.7 to 8.6V. To study the voltage regulation in Zener diode regulation circuit. Conclusion. Theory: Zener Diode: Zener diode is a heavily doped PN junction diode. The symbol for a zener diode is shown in Below Figure. Objectives: • Obtain the I-V curves of a signal diode and a zener diode • Compare the performance of different rectifier circuits . EXPERIMENT: DIODE & ZENER DIODE Objective:- To study the forward and reverse bias characteristics of diode and zener diode. Thus it acts as a voltage regulator. V characteristics of Zener diode and the load line) - Give the quiescent point Q(V Z,I Z). ZENER DIODE CHARACTERISTICS Objectives: To study the characteristics of Zener diode. Zener diode has the property of behaving like a dc battery in ‘on’ state (i.e. To study the voltage regulation in Zener diode regulation circuit. Zener diode is nothing but a single diode connected in a reverse bias mode and Zener diode can be connected in reverse bias positive in a circuit as shown as picture. The electric field may become large enough that covalent bonds are broken and electron-hole pairs are created. In ‘on’ state , the voltage across zener diode remains constant until the voltage across it deops less than VZ . Figure 2. An 8V regulator with a 12V source that requires 1A of current requires a 250Ω resistor rated at 4W and an 8V Zener diode rated at 8W. 11 CONCLUSION Experimentally, throughout this experiment, we can see that the characteristics of junction diode, Zener diode and also the light emitting diode almost fits the theoretical facts. - Draw a tangent to the Zener diode characteristic at the quiescent point and construct a right-angled triangle using the tangent. But due to higher doping concentration, higher current flows through the Zener diode.In the third quadrant, the magic happens. Typically, Zener diodes are only available at up to 5W, so in even a medium voltage/current application like this example, it may be more practical to use an integrated circuit regulator. Here the Zener diode acts like an ordinary diode.When a forward voltage is applied, current flows through it. Objective: To study and verify the functionalityof Zener diode in forward bias and reverse bias and to Plot Volt-Ampere Characteristics of Zener Diode. The behaviour of a diode in a circuit is given by its I-V characteristics. 6- Conclusion (Zener Diode V-I Characteristics) When the applied voltage exceeds an specific amount Zener breakdown takes place. This diode can conduct in forward bias just like a normal diode. 6. However, when the reverse voltages are applied, or reverse feedback is provided, a tiny leakage current is observed between the zener voltage and 0V. Zener Diode Characteristics - Zener regulator Prelab: You are tasked to determine experimentally the characteristic curve of a reverse-biased Zener diode. when the voltage across the zener diode exceeds its zener voltage rating VZ) . Zener Diode I-V Characteristics Curve. The layer at the junction of ‘P’ type and ‘N’ type. To construct a Zener voltage regulator and experimentally determine the range over which the Zener maintains a constant output voltage. If the reverse current exceeds this maximum rating, the diode will get damaged. Diode I-V characteristics The I-V graph for a non-ideal diode is shown in figure 2, along with an ideal approximation to accommodate the non-zero threshold voltage. Apparatus:-Experimental kit and patch cords. Calculate static and dynamic resistance of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). - Determine the differential resistance r Z from the intersections at the axes. Instead of a straight line representing the cathode, the zener diode has a bent line that reminds you of the letter Z (for zener). For Zener diodes, silicon is preferred to Ge because of its high temperature and current capability. Even for a small change in applied voltage, there is a high increase in net current through the diode. (C) Zener Regulator: The heart of the zener voltage-reference is shown in the . 3 Theory of experiment The diode is a device formed from a junction of n-type and p-type semiconductor material. In Experiment B, a 6v Zener Diode used is conducting (the bulb comes on) in reverse biased because the applied voltage is greater than its breakdown voltage and thus shows that the breakdown region is the region of operation of the zener diode. Jrd . In the forward biased mode the zener diode operates as a p-n diode. block of Figure 1. The current flows without much restriction while there can be a voltage drop of about 0.3 to 0.7 Volts. When forward biased, it behaves like a normal signal diode, but when the reverse voltage is applied to it, the voltage remains constant for a wide range of currents. The diode will be easier to understand if we compare the diode to another two terminal device we know (and love) the resistor. Result: a. A semi-conductor diode is the most common type diode, which is a piece of semi-conductor material with a p-n junction connected to two terminals. A basic semiconductor diode can operate in forward bias but it cannot conduct during reverse bias. Zener Diode Characteristics. But for simplicity, both types are called Zener Diodes. In the reverse biased mode zener diode has large breakdown voltage and though the current increases the voltage remains constant. The special type of diode that can conduct in reverse bias is referred to as a Zener diode. The zener diode characteristics have been studied. Find Zener Breakdown Voltage in Reverse Biased conditions. 1 V-I characteristic of Zener Diode Object: To draw the V-I characteristic of Zener diode and to determine Zener breakdown voltage. This property of zener diode makes its use as a voltage regulator. Zener voltage: It is that reverse bias voltage at the which junction breakdown completely and large current flows through the device at a constant potential.. II. A diode allow electric current to pass in forward direction and block current in reverse direction. 3. The current-voltage characteristic curve of the Zener diode … Voltage – Current characteristics of semiconductor diode The principal schematic of circuit connection is illustrated below in the Figure 2. Figure 4. With your lab partner, brainstorm on the following ideas: A zener diode is a silicon pn junction device that is designed for operation in the reverse-breakdown region. The Zener diode acts as a conventional diode when it is connected in the forward direction. Lab Report Zener Diode EE 462: Laboratory # 4 – Science report for no cost for you. Zener diode is a silicon semiconductor with a p-n junction that is specifically designed to work in the reverse biased condition. The I-V Characteristics Curve of a zener diode, shown below, is the curve which shows the current-voltage relationship of a zener diode. In the forward bias condition, the zener diode behaves like an ideal diode within specified current and power limits, but it differs in reverse bias condition where the zener diode has very steep avalanche characteristic at the … To draw the characteristic curve of a zener diode and to determine its reverse break down voltage. Supervisor: Munther N. Thiyab Zener diode characteristics 1 Experiment #5 Object To study and measure the effects of forward and reverse bias on the Zener diode current. Brief Theory: When a reverse-bias voltage is applied to a pn junction, the electric field in the space-charge region is increases. Apparatus used: Zener diode, voltmeter (0-2volt), voltmeter (0-30 volt), mili-ammeter, micro- ammeter, variable source (0-2 volt and 0-30 volt). References: • EE 121 Handouts : 5 Lab. Due to heavily doped, its The junction for the Zener diode … A diode characteristic curve is a curve that describes the characteristic of diode and it is normally based on experiment data. Conclusion about PN junction characteristics This article will help to explain the characteristics which make up zener diodes, specifically how the voltage across a zener diode varies with the current flowing through it. Half wave rectifier circuit diagram Obtained data (all tables with measured values, observed graphs and data, calculations): All the tasks were conducted only with germanium diode. 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