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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. 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. Apparatus used: Zener diode, voltmeter (0-2volt), voltmeter (0-30 volt), mili-ammeter, micro- ammeter, variable source (0-2 volt and 0-30 volt). When a reverse-bias voltage is applied to a pn junction, the electric field in the space-charge, region is increases. Find Zener Breakdown Voltage in Reverse Biased conditions. Here the Zener diode acts like an ordinary diode.When a forward voltage is applied, current flows through it. The list of the componentsof equipment required to perform this experiment mainly include Zener diode, Milliammeter, Voltmeter, and DC supply(variable), and Resistors 1. 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. The current-voltage characteristic curve of the Zener diode is shown below. Fig 2:Zener diode characteristic curve The forward bias region of a Zener diode is identical to that of a regular diode. Breakdown voltage theoretically is equal to desired output voltage. The main aim of this experiment lies in to find out the basic value of the Zener voltage. 2- Principles Zener diodes are semiconductor diodes which are operated in the reverse direction 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. 3. Theory:-A Semiconductor diode is prepared by joining P and N sections of a semi conducting material like germanium or silicon. Brief Theory: When a reverse-bias voltage is applied to a pn junction, the electric field in the space-charge region is increases. A Zener diode 2. We are going to learn about an experiment to find out the Zener breakdown voltage and draw the characteristics of Zener diode. The electric field may become large enough that covalent bonds are broken and, electron-hole pairs are created. 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. Electrons are swept into the n-region and holes are swept into the p-, region by the electric field, generating a large reverse bias current. Procedure . Apparatus:-Experimental kit and patch cords. To study the voltage regulation in Zener diode regulation circuit. Required Parts and Equipment's 1. 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. The forward characteristics of a Zener diode is shown in figure. To study the characteristics of Zener diode. 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. To study the voltage regulation in Zener diode regulation circuit. VI characteristics of zener diode. Experiment No: 2 ZENER DIODE CHARACTERISTICS AIM: 1. 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. Unlike ordinary PN junction diode, the reverse current in Zener diode is measured using milli-ammeter due to the large flow of current. 6. Here V z is the Zener breakdown voltage. Due to heavily doped, its Zener Diode Characteristics - Zener regulator Prelab: You are tasked to determine experimentally the characteristic curve of a reverse-biased Zener diode. 3. 2. As we increase the reverse voltage, initially a small reverse saturation current Io. Select the Zener diode from the drop down list. The typical forward voltage at room temperature with a current of around 1 mA is around 0.6 volts. Theory: Zener Diode: Zener diode is a heavily doped PN junction diode. This was conducted as an introductory to Electronics laboratory and in line with some topics in lecture classes. The circuit for studying the forward bias characteristics of a Zener diode is as shown in the figure1. This phenomenon is called, . We will learn about the V-I characteristics of Zener Diode and to draw the V-I characteristics graph. Procedure: Forward Bias Characteristics: 1. The circuit was constructed according to Figure- 02. Do the same experiment by connecting the Zener diode in the forward bias. It is acting The symbol of zener diode is similar to the normal p-n junction diode, but with bend edges on the vertical bar. Experiment No.4 Zener diode Characteristics Object: To study and measure the effects of forward and reverse bias on the zener diode current. 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. 3. Zener Diode Definition Zener Diode Working Zener Diode Circuit Symbol VI Characteristics of Zener Diode Zener Diode Applications FAQs. It is read as n-type of Zener diode and the other as p-type. 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 … 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.. Variable minimum supply voltage should be larger than, desired output voltage for the diode to operate in proper operation. Zener Diode I-V Characteristics Curve. The layer at the junction of ‘P’ type and ‘N’ type. 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. Only minority carriers cause small leakage current at reverse voltage. Assignment . To find Zener break down voltage in reverse biased condition. Course Hero is not sponsored or endorsed by any college or university. Figure 2 shows the current versus voltage curve for a Zener diode. The VI characteristics of a zener diode … To draw the characteristic curve of a Zener diode and to determine its reverse breakdown voltage. - Determining the quiescent point Q(VZ,IZ) - Determining the differential resistance of a Zener diode. Calculate static and dynamic resistance of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). Figure 1 shows the V-I char… 3 Theory of experiment The diode is a device formed from a junction of n-type and p-type semiconductor material. Observe the nearly constant voltage in the breakdown region. Normally this circuit used when a constant reference voltage is needed. For part B, Value for current across R (I. calculated by using the equation below to find the experiment regulation. It is almost identical to the forward characteristics of a P-N junction diode. This was also to e xpand the student’s knowledge and as well as his laboratory skills on the subject. Zener diode characteristics 1 Experiment #5 Object To study and measure the effects of forward and reverse bias on the Zener diode current. The Zener diode is a unique device which exploits a property of diodes that is generally avoided in standard diode applications. Which is in A, will follow. As the breakdown voltage is appr… To construct a Zener voltage regulator and experimentally determine the range over which the Zener maintains a constant output voltage. Zener diodes can be tested for opens, shorts, or leakage with an ohmmeter. –A™Ì{K«aiX¹E[v‡ßÚ_ÜB‚ì߁ ’Ì §P!‰. 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 not only allows current to flow from anode to cathode but also, in the reverse direction on reaching the Zener voltage. For this circuit we can write the. The reverse-bias current created by breakdown mechanism is limited only by the external, circuit. Do check out – V-I characteristics of PN Junction Diode CONCLUSION This experiment focuses on the investigation of the basic characteristics of a diode. 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…˜, But due to higher doping concentration, higher current flows through the Zener diode.In the third quadrant, the magic happens. 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. This preview shows page 1 - 3 out of 8 pages. Forward Characteristics of Zener Diode. Typical diodes have a very high reverse breakdown voltage, the voltage at which the diode begins to conduct in the reverse direction. Reverse Characteristics. 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. when the voltage across the zener diode exceeds its zener voltage rating VZ) . 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. 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. This voltage is generally avoided in standard diodes, but Zener diodes are designed and manufactured to have a very specific reverse breakdown voltage. EXPERIMENT NUMBER 4 ... characteristics of diodes and the use of diodes in rectifier and limiter circuits. To calculate static and dynamic resistances of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). Objectives: To study the characteristics of Zener diode. 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. In our previous articles, we explain in detail about diodes, PN junction diode, semiconductors etc. 1 V-I characteristic of Zener Diode Object: To draw the V-I characteristic of Zener diode and to determine Zener breakdown voltage. 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. 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. Objective: To study and verify the functionalityof Zener diode in forward bias and reverse bias and to Plot Volt-Ampere Characteristics of Zener Diode. Feedback Zener diode regulators provide a constant output voltage despite changes in the input voltage or output current. Zener diodes are used in application for, which a constant voltage in breakdown is desirable. 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. Simulator . In general, the cathode of a diode is marked by a solid line on the diode.The Resistors: 0.1kΩ, 1kΩ (2 piece), 3.3kΩ. The P type has excess This property of zener diode makes its use as a voltage regulator. 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. 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. Once the values are found it should be plotted as characteristics curve. With your lab partner, brainstorm on the following ideas: To draw the characteristic curve of a zener diode and to determine its reverse break down voltage. The lead connected to the p-type material is called the anode and the lead connected to the n-type material is the cathode. First identify the terminals of Zener diode, there will be a black colored circular band on one side of the 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. Zener diode voltage regulator. References: • EE 121 Handouts 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. (Zener Diode V-I Characteristics) When the applied voltage exceeds an specific amount Zener breakdown takes place. 2. On top of that, the transition into reverse breakdown is very sharp. In this article, we are going to explain Zener diode and its applications in detail. The function of R in this circuit is to, safe value so that the diode does not overheat. To plot Volt-Ampere characteristics of Zener diode. The electric field may become large enough that covalent bonds are broken and electron-hole pairs are created. Zener diode has the property of behaving like a dc battery in ‘on’ state (i.e. Reference . To determine whether a zener diode is regulat- ing at the proper voltage, a regulation test must be performed. Objectives: • Obtain the I-V curves of a signal diode and a zener diode • Compare the performance of different rectifier circuits . Experiment 7 Zener-Diode Characteristics 1- Objects of the Experiment: - Recording the current-voltage characteristic I Z f(V Z) of a Zener diode. To construct a zener voltage regulator and experimentally determine the range over which the zener maintains a constant output voltage. 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