Controls . As the applied reverse voltage tends to increase that result in the increment of the width of the depletion region. (0 – 15 V) directions. the same for both PN junction diode and Zener diode. This results in the formation of more free electrons. The reverse biasing means the n-type material of the diode is connected to the positive terminal of the supply and the P-type material is connected to the negative terminal of the supply. First identify the terminals of Zener diode, there will be a black colored circular band on one side of the Zener diode. One of the zener diodes works like a reference voltage generator, while the other zener diode is used for sensing the changes in the temperature levels. Theory: Course. V S – V Z = V R; 8V – 6V = 2V. circuit diagram. the negative terminal and N-region to the positive terminal of the DC power The voltage across the diode can be What is the Difference Between Electronic Devices And Integrated Circuit? may damage the resistor or the diode. Zener Diode Circuit Diagram. The diagram shows a bridge network built using a pair of resistors and a pair of Zener diodes having identical characteristics. supply. Voltage regulator. It is acting Consider the experiment below, The circuit describes a 3.3v zener diode based voltage shifter. This is to compensate for the damage that occurs in the case of a pn junction diode when the reverse bias exceeds the breakdown voltage and thereby . 5. Zener diodes are used for voltage regulation, as reference elements, surge suppressors, and in switching applications and clipper circuits. Ptype semiconductor will have excess amount of holes in configuration and N type semiconductor will have excess amount of electrons. Difference Between Von Neumann and Harvard Architecture? The connections are made as given in the Just as cut in voltage in normal diode here it is Zener voltage. Because of carrier multiplication, a huge multiple of free electrons are created and the complete region of the diode becomes conductive resulting in the breakdown known as avalanche breakdown. The Zener diode mainly operates in reverse biased condition. Based on the requirement of the voltage for the particular device the diode with that particular breakdown voltage has been chosen. are taken as negative. A zener diode is a silicon pn junction device that is designed for operation in … If both types of character… The zener diode tester circuit functions from a regular 9 volt battery no line supply or special high voltage battery simply being needed. is determined from the graph as shown. As the applied reverse voltage tends to increase that result in the increment of the width of the depletion region. To the circuit, the reverse voltage applied varies slowly. Analog lab 1-2 - Diode characteristics & Design of Rectifier circuits Diode characteristics & Design of Rectifier circuits. THE CIRCUIT The circuit is a single building block called a flyback oscillator. 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. (BS) Developed by Therithal info, Chennai. Hence the forward characteristic is The circuit for studying the forward bias characteristics of a Zener diode is as shown in the figure1. The circuit diagram to plot the VI characteristics of a zener diode is shown. 3. The voltage applied beyond this limit From the plot at which point of voltage the spike in current is noticed that voltage value is referred to as Zener breakdown voltage. This has been done by connecting the diode in reverse bias voltage and current readings are tabulated. Insert Key Button:This is used to insert key on the switch connected with battery.This key is only activated when the connection is perfect. Firstly the connections are made as per the circuit diagram. One is connected in series to the diode whereas other is connected in series to the resistor. increased only up to the specified range in the forward (0 – 2 V) and reverse reverse current in Zener diode is measured using milli-ammeter due to the large Calculate static and dynamic resistance of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). Clipping Circuit is used to prevent the output voltage from exceeding pre-determined voltage without altering the input signal or waveform. # Characteristics of a Zener Diode The above diagram shows the V-I characteristics of the Zener diode behavior. Circuit Theory (EE112) Uploaded by. It is read as n-type of Zener diode and the other as p-type. Draw the Zener Diode Voltage Regulator Circuit Diagram. chung chinngee. Resistor calculation for the above zener voltage regulator circuit, Characteristics of a Zener Diode. Figure (a) Zener diode and its symbol (The black colour ring denotes the negative terminal of the Zener diode) Figure (b) Zener diode in forward bias. 2019/2020 Objective: To study and verify the functionalityof Zener diode in forward bias and reverse bias and to Plot Volt-Ampere Characteristics of Zener Diode. voltage along negative x-axis and the reverse bias current along negative voltage. Once we apply a reverse voltage to a Zener diode, a minimal level of current runs via the circuit. Further, these again collide with remaining stationary ions and this process continues it is referred to as. Zener Diode acts as a normal diode when the applied voltage is less than the Zener breakdown voltage. Fig. At this time note down the readings for both ammeters and voltmeter. It is preferably used in ammeters, voltmeters, and ohmmeters because here the reference voltage is required. I L = 0.10/6 = 16mA. CIRCUIT DIAGRAM . To have a detailed understanding of Zener diode and its working, you should also read up … Ans: By studying these concepts, you will be able to explain Zener diode as a voltage regulator in a better way and solve exercise questions. This value of the Zener voltage is properly adjusted at the time of manufacturing by the proper concentration in. The symbol of zener diode is similar to the normal p-n junction diode, but with bend edges on the vertical bar. 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. Unlike ordinary PN junction diode, the Even further application of voltage values can see that current values increase in the circuit but the voltage remains constant across the diode. Hence in this way, the experiment is performed so that the breakdown voltage value can be found. But due to higher doping concentration, higher current flows through the Zener diode.In the third quadrant, the magic happens. reverse current in Zener diode is measured using milli-ammeter due to the large Design a zener voltage regulator circuit to drive a load of 6V, 100mW from an unregulated Input supply of Vmin = 8V, Vmax = 12V using a 6V zener diode? Procedure: Forward Bias Characteristics: 1. Tags : Physics Practical Experiment Physics Practical Experiment, Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail, Voltage-Current Characteristics of a Zener Diode. Once the applied voltage exceeds the value of  voltage it tends to conduct. It means that the anode must be connected to the negative side of the voltage source and the cathode must be connected to the positive side. Hence this type of breakdown is referred to as. Let take a minimum current Iz as 10mA at Full Load. The circuit diagram of the Zener diode is shown in the figure below. The diode is basically made up of semiconductors which have two characteristics, P type and N type. Find Zener Breakdown Voltage in Reverse Biased conditions. In Zener diode, the junction is doped with the highest concentration. In case of occurring of  break down further, there is no possibility of occurrence of avalanche breakdown. The breakdown potential, also called the zener potential i.e V z ≈ 6.30V. We use Zener diodes for voltage regulation and voltage stabilisation. If a voltage beyond Zener breakdown voltage is employed, Zener breakdown takes place. Zener diode temperature characteristic It can be seen in the example given that there is a noticeable difference between the specification for the Zener diode reverse voltage at 0°C and 50°C. Hence it is widely used in Clipping Circuits. Choose Zener Diode: This combo box is used to select different zener diodes having different zener voltage Series Resistance: Value of the Series Resistance can be directly input here.. Slider. When discussing about the diode circuits we should look through the graphical representation of the operation of the Zener diode. UCSI University. The Zener breakdown voltage is the minimum reverse biased voltage below which the diode blocks the reverse … EXPERIMENT: DIODE & ZENER DIODE Objective:- To study the forward and reverse bias characteristics of diode and zener diode. 1: Forward Bias Condition Fig. The Zener diode is employed in reverse biasing. VI characteristics of zener diode 2. input voltage may be raised in steps of, say 0.1V to find the break-down Theory:-A Semiconductor diode is prepared by joining P and N sections of a semi conducting material like germanium or silicon. This shows that the Zener diode behaves like an ordinary diode when it is connected in forward bias. Operation of Zener Diode: Zener diodes are normally used only in the reverse bias direction. current are taken as positive. The critical parameter of this type of diodes is the Zener breakdown voltage. Similarly, experiment by keeping the diode in forwarding bias and tabulate the readings. The below figure is the zener diode symbol. Zener diode applications. Circuit Diagram: Fig. In zener diode, electric current flows from both anode to cathode and cathode to anode. Then simultaneously note down the voltmeter and ammeter readings. This needs to be taken into account if the circuit and equipment in which the Zener diode is to be used is subject to temperature change. The P type has excess As there exist the maximum concentration of the impure atoms in it. In the reverse bias, Zener breakdown DC power supply is reversed so that the P- region of the diode is connected to The diode is one of the basic components in electronic circuits. However, the Zener Diode or Breakdown Diode, as they are sometimes referred too, are basically the same as the standard PN junction diode but they are specially designed to have a low and specified Reverse Breakdown Voltage which takes advantage of any reverse voltage applied to it. Select the Zener diode from the drop down list. Apparatus:-Experimental kit and patch cords. The reverse voltage and reverse current 11. The LED reduces the output of the high-voltage section. The slope in the linear portion of the Care should be taken to connect the terminals of ammeter, voltmeter, dc power supply and the Zener diode with right polarity. along the x-axis and the forward current along the y-axis. flow of current. The diagram represents the Volt-Ampere Characteristics of Silicon and Germanium diodes. The forward voltage and the forward The circuit connection is shown in fig(5). Initially, the voltage is increased in The Ptype and N type semiconductors represent positive and negative type semiconductors. Once the values are noted the plot of characteristics curves between voltage and current is plotted. forward characteristics is calculated. Zener diode functions like an ordinary varied with the help of the variable DC power supply. Usually, the condition of the diode with basic p-n as its junction during reverse bias is that there is no chance of conduction because the depletion region width is comparatively high. Due to the gain in kinetic energy of the minority carriers, these free electrons in movement collide with the stationary ions. Diodes and Diode Circuits TLT-8016 Basic Analog Circuits 2005/2006 2 3.1 Diode Characteristics Small-Signal Diodes Diode: a semiconductor device, which conduct the current in one direction only. circuit diagram. steps of 0.5V. Unlike ordinary PN junction diode, the Experiment No.4 Zener diode Characteristics Object: To study and measure the effects of forward and reverse bias on the zener diode current. Two terminals: anode and cathode. PN junction diode in the forward direction. The VI characteristics of the Zener diode is described through the graph, mentioned in the figure below. WatElectronics.com | Contact Us | Privacy Policy, What is a Ballistic Galvanometer : Construction & Its Working, Arduino Technology Architecture and Its Advantages, Embedded Systems Role in Automobiles with Applications, Traffic Light Control System using Microcontroller, Light Sensor Circuit Diagram with Working Operation, What is 555 Timer IC – Working with Operating Modes, What is RISC and CISC Architecture and their Differences. occurs at a particular voltage called Zener voltage V. The breakdown voltage of the Zener diode Here the Zener diode acts like an ordinary diode.When a forward voltage is applied, current flows through it. The connections are given as per the y-axis. These are preferably applicable in voltage regulators. line in the forward characteristics gives the knee voltage or threshold voltage (iii) Instead of a straight line representing the cathode, the zener diode has a bent line that reminds you of the letter Z (for zener). 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