But due to higher doping concentration, higher current flows through the Zener diode.In the third quadrant, the magic happens. Once the values are found it should be plotted as characteristics curve. The lead connected to the p-type material is called the anode and the lead connected to the n-type material is the cathode. Figure 2 shows the current versus voltage curve for a Zener diode. Here V z is the Zener breakdown voltage. Resistors: 0.1kΩ, 1kΩ (2 piece), 3.3kΩ. Select the Zener diode from the drop down list. Zener diode has the property of behaving like a dc battery in ‘on’ state (i.e. Procedure . Fig 2:Zener diode characteristic curve The forward bias region of a Zener diode is identical to that of a regular diode. Figure 1 shows the V-I char… 3. First identify the terminals of Zener diode, there will be a black colored circular band on one side of the Zener diode. The layer at the junction of ‘P’ type and ‘N’ type. CONCLUSION This experiment focuses on the investigation of the basic characteristics of a diode. 2- Principles Zener diodes are semiconductor diodes which are operated in the reverse direction In the reverse bias condition the Zener diode is an open circuit and only a small leakage current is flowing as shown on the exaggerated plot. Breakdown voltage theoretically is equal to desired output voltage. The list of the componentsof equipment required to perform this experiment mainly include Zener diode, Milliammeter, Voltmeter, and DC supply(variable), and Resistors 1. 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. Theory:-A Semiconductor diode is prepared by joining P and N sections of a semi conducting material like germanium or silicon. Do check out – V-I characteristics of PN Junction Diode We are going to learn about an experiment to find out the Zener breakdown voltage and draw the characteristics of Zener diode. We are going to learn about an experiment to find out the Zener breakdown voltage and draw the characteristics of Zener diode.Why should we do this experiment? Procedure: Forward Bias Characteristics: 1. This preview shows page 1 - 3 out of 8 pages. following equation and we can construct load line using this equation: For the part A, The purpose of the experiment is to find the characteristic of the zener diode. A Zener diode is a special type of diode designed to reliably allow current to flow "backwards" when a certain set reverse voltage, known as the Zener voltage, is reached.. Zener diodes are manufactured with a great variety of Zener voltages and some are even variable. 3. As we increase the reverse voltage, initially a small reverse saturation current Io. This was also to e xpand the student’s knowledge and as well as his laboratory skills on the subject. 6. 3. For part B, Value for current across R (I. calculated by using the equation below to find the experiment regulation. 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. Required Parts and Equipment's 1. Find Zener Breakdown Voltage in Reverse Biased conditions. The electric field may become large enough that covalent bonds are broken and, electron-hole pairs are created. Course Hero is not sponsored or endorsed by any college or university. Variable minimum supply voltage should be larger than, desired output voltage for the diode to operate in proper operation. New York City College of Technology, CUNY, International Islamic University Malaysia (IIUM), UEEA1313_Chapter_1_Part_3_Special_Purpose_Diodes.pptx, Borough of Manhattan Community College, CUNY, University of Malaysia, Perlis • BCP ET110, New York City College of Technology, CUNY • EET 1240, International Islamic University Malaysia (IIUM) • EECE 1312, University of California, Irvine • EECS 70, Borough of Manhattan Community College, CUNY • MAT 302, International Islamic University Malaysia (IIUM) • ENGINE 1312. When a reverse-bias voltage is applied to a pn junction, the electric field in the space-charge, region is increases. In general, the cathode of a diode is marked by a solid line on the diode.The A Zener diode is a diode which allows current to flow in the forward direction in the same manner as an ideal diode, but will also permit it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage ... Characteristics of Zener diode.. If the current is not sufficiently limited, a large power can be dissipated in the junction that may, Diodes are intended to operate in the breakdown region. Zener diode voltage regulator. On top of that, the transition into reverse breakdown is very sharp. Objectives: • Obtain the I-V curves of a signal diode and a zener diode • Compare the performance of different rectifier circuits . Only minority carriers cause small leakage current at reverse voltage. The reverse-bias current created by breakdown mechanism is limited only by the external, circuit. Apparatus A Zener diode (with small reverse breakdown voltage of about 6 volts), [i.e., V z = 6 V], a ten volt battery, a high resistance rheostat, two 0-10 V voltmeter, one 0-100 mA ammeter, one 20 Ω. resistance, one way key, connecting wires. To see the circuit diagram, click on the 'Show/hide circuit diagram' check box seen inside the simulator window. To calculate static and dynamic resistances of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). Zener diodes can be tested for opens, shorts, or leakage with an ohmmeter. In ‘on’ state , the voltage across zener diode remains constant until the voltage across it deops less than VZ . EXPERIMENT: DIODE & ZENER DIODE Objective:- To study the forward and reverse bias characteristics of diode and zener diode. In this article, we are going to explain Zener diode and its applications in detail. The typical forward voltage at room temperature with a current of around 1 mA is around 0.6 volts. To draw the characteristic curve of a Zener diode and to determine its reverse breakdown voltage. To construct a Zener voltage regulator and experimentally determine the range over which the Zener maintains a constant output voltage. Zener diode is a special kind of diode which permits the flow of current in the forward direction as well as in reverse direction when the voltage is above a certain voltage known as breakdown or Zener voltage. The symbol of zener diode is similar to the normal p-n junction diode, but with bend edges on the vertical bar. To study the voltage regulation in Zener diode regulation circuit. Typical diodes have a very high reverse breakdown voltage, the voltage at which the diode begins to conduct in the reverse direction. Firstly t… To plot Volt-Ampere characteristics of Zener diode. This voltage is generally avoided in standard diodes, but Zener diodes are designed and manufactured to have a very specific reverse breakdown voltage. Feedback The P type has excess With your lab partner, brainstorm on the following ideas: It is read as n-type of Zener diode and the other as p-type. In our previous articles, we explain in detail about diodes, PN junction diode, semiconductors etc. It is almost identical to the forward characteristics of a P-N junction diode. (Zener Diode V-I Characteristics) When the applied voltage exceeds an specific amount Zener breakdown takes place. A Zener Diode is a special kind of diode which permits current to flow in the forward direction as normal, but will also allow it to flow in the reverse direction when the voltage is above the breakdown voltage or ‘zener’ voltage.u000b Zener diodes are designed so that their breakdown voltage is much lower - for example just 2.4 Volts. The Zener diode is a unique device which exploits a property of diodes that is generally avoided in standard diode applications. 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. We set the DC supply to 0 V and, We set the DC supply (E) to the values appearing in Table- 01 and measured both V, using the Ohm’s law given in the table and. The VI characteristics of a zener diode … Zener voltage is the basic voltage that is set as the cut-off value, and the breakdown value of the voltage must be lying close to the desired value that we want it is just approximated. VI characteristics of zener diode. Calculate static and dynamic resistance of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). This phenomenon is called, . Apparatus:-Experimental kit and patch cords. Unlike ordinary PN junction diode, the reverse current in Zener diode is measured using milli-ammeter due to the large flow of current. Zener Diode Characteristics - Zener regulator Prelab: You are tasked to determine experimentally the characteristic curve of a reverse-biased Zener diode. Apparatus used: Zener diode, voltmeter (0-2volt), voltmeter (0-30 volt), mili-ammeter, micro- ammeter, variable source (0-2 volt and 0-30 volt). Observe the nearly constant voltage in the breakdown region. We will learn about the V-I characteristics of Zener Diode and to draw the V-I characteristics graph. The forward characteristics of a Zener diode is shown in figure. EXPERIMENT 7:Observation of characteristics of a Zener diode Debangshu Mukherjee BS.c Physics,1st Year Chennai Mathematical Institute 7.11.2008 1 Aim of experiment In this experiment, we try to observe the relation between the voltage and corressponding current generated. For correct voltage regulation, we need to find out precisely what voltage should be across the Zener diode.Zener breakdown voltage should be approximately close to the desired … Zener Diode Definition Zener Diode Working Zener Diode Circuit Symbol VI Characteristics of Zener Diode Zener Diode Applications FAQs. Objective: To study and verify the functionalityof Zener diode in forward bias and reverse bias and to Plot Volt-Ampere Characteristics of Zener Diode. Do the same experiment by connecting the Zener diode in the forward bias. Zener diodes are used in application for, which a constant voltage in breakdown is desirable. 2. Zener diodes are a special type of semiconductor diode– devices that allow current to flow in one direction only –that also allow current to flow in the opposite direction, but only when exposed to enough voltage. Lab Report Experiment No- 02 - Objectives To study the characteristics of Zener diode To study the voltage regulation in Zener diode regulation circuit, 3 out of 3 people found this document helpful. The function of R in this circuit is to, safe value so that the diode does not overheat. It is acting A Zener diode not only allows current to flow from anode to cathode but also, in the reverse direction on reaching the Zener voltage. The circuit was constructed according to Figure- 02. The electric field may become large enough that covalent bonds are broken and electron-hole pairs are created. To construct a zener voltage regulator and experimentally determine the range over which the zener maintains a constant output voltage. A Zener diode 2. Forward Characteristics of Zener Diode. Brief Theory: When a reverse-bias voltage is applied to a pn junction, the electric field in the space-charge region is increases. References: • EE 121 Handouts Theoretically, Zener diode will, have zero current across it and the voltage across will be vertical line which is parallel to i, Also, the Zener diode will only be operate if the value of input voltage larger than, We can provide nearly constant output voltage from variable supply voltage by using simple. It operates in breakdown region because majority, carrier moves away from the junction cause the depletion region to increase and the current difficult to, flow. - Determining the quiescent point Q(VZ,IZ) - Determining the differential resistance of a Zener diode. To find Zener break down voltage in reverse biased condition. Here the Zener diode acts like an ordinary diode.When a forward voltage is applied, current flows through it. The main aim of this experiment lies in to find out the basic value of the Zener voltage. Due to heavily doped, its Experiment No: 1 Diode Characteristics Objective: To study and verify the functionality of a) PN junction diode in forward bias b) Point-Contact diode in reverse bias ... Zener diode is a P-N junction diode specially designed to operate in the reverse biased mode. Theory: Zener Diode: Zener diode is a heavily doped PN junction diode. The current-voltage characteristic curve of the Zener diode is shown below. EXPERIMENT NUMBER 4 ... characteristics of diodes and the use of diodes in rectifier and limiter circuits. Experiment No: 2 ZENER DIODE CHARACTERISTICS AIM: 1. when the voltage across the zener diode exceeds its zener voltage rating VZ) . This was conducted as an introductory to Electronics laboratory and in line with some topics in lecture classes. Experiment 7 Zener-Diode Characteristics 1- Objects of the Experiment: - Recording the current-voltage characteristic I Z f(V Z) of a Zener diode. For this circuit we can write the. Reverse Characteristics. To study the voltage regulation in Zener diode regulation circuit. To draw the characteristic curve of a zener diode and to determine its reverse break down voltage. To study the characteristics of Zener diode. Normally this circuit used when a constant reference voltage is needed. CMvG¾½^ùññ ²ºÌJ6”*Ú.g'C?¸„ií÷4ÔÎðjç;¼Z㐚t±‘ë5€ªc©Dô¬Œ‘fcà åË1:zÀ• ôaX£ŒEÏ2h);‡…(x1z-Ç.KÁüC¤Mݞ³Õ‚;ŽÝöãZ­¥FCUóV…˜, Reference . We will then plot it to get the depen-dence. Zener diode characteristics 1 Experiment #5 Object To study and measure the effects of forward and reverse bias on the Zener diode current. –A™Ì{K«aiX¹E[v‡ßÚ_ÜB‚ì߁ ’Ì §P!‰. Connections can be made as seen in the circuit diagram by clicking and dragging the mouse from one connecting terminal to the other connecting terminal of the devices to be connected. 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 breakdown voltage in reverse bias condition. Objectives: To study the characteristics of Zener diode. The circuit for studying the forward bias characteristics of a Zener diode is as shown in the figure1. Which is in A, will follow. Simulator . 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