# Ppt on zener diode characteristics

##### Diodes 1. Basic diode concept. 2. Load-line analysis of diode circuit. 3. Zener-diode voltage regulator circuit. 4. Ideal-diode model. 5. Applications.

provides a nearly constant voltage to a load from a variable source. Example 10.3 The voltage-regulator circuit of Figure 10.9 has R = 1k  and use a Zener diode having the characteristic shown in Figure 10.10. Find the output voltage for V ss = 15V. Repeat for V ss = 20V. R = 1k Vss + i R +V D = 0 i = 0, V/

##### CHAPTER 3 Special Diodes. OBJECTIVES Describe and analyze the function and applications of: surge protectors varactors switching diodes LEDs & photodiodes.

-shooting techniques for special diodes Zener Diodes A zener is a diode with a defined value of reverse breakdown voltage A zener is used in reverse breakdown mode The voltage across a zener is more or less independent of the current through it The function of a zener is to provide a voltage reference in a circuit Zener Characteristics Some important zener characteristics: Nominal Zener Voltage : 5.1V zener, 12V zener, etc. Nominal Bias Current/

##### Diode Circuits.

full brightness. + + - - A reading V reading Diode Characteristic circuit A reading Rp R D V reading Ev A diode is a nonlinear device and typical linear circuit analysis methods do not apply! Diode Characteristic for Small-Signal Diodes VT ~ 26 mV Vknee less than 1mA at 300K/ Slope of the load is -1/R Reverse bias region Load Line Analysis of Complex Circuits Thevenin Equivalent Problem Consider the Zener diode regulator shown in figure (a). Find the load voltage vL and the source current iS if Vss=24V, R=1./

##### Neamen Microelectronics, 4eChapter 2-1 McGraw-Hill Microelectronics Circuit Analysis and Design Donald A. Neamen Chapter 2 Diode Circuits.

Circuit Neamen Microelectronics, 4eChapter 2-19 McGraw-Hill Equivalent Circuits for Input Cycles Negative input cycle Positive input cycle Neamen Microelectronics, 4eChapter 2-20 McGraw-Hill Voltage Regulator The characteristics of the Zener diode determines V L. Neamen Microelectronics, 4eChapter 2-21 McGraw-Hill Design Example 2.5 Neamen Microelectronics, 4eChapter 2-22 McGraw-Hill Load Line Analysis The reverse bias I-V/

##### 0 Chap. 3 Diodes Simplest semiconductor device Nonlinear Used in power supplies Voltage limiting circuits.

 1nA -V Z is the reverse voltage at which the diode breaks down. V Z is the Zener voltage in a Zener diode (controlled breakdown). Otherwise, V Z is the peak inverse voltage (PIV) ISIS 20 Forward bias region For Silicon diodes, very little current flows until V  0.5V At V  0.7V, the diode characteristics are nearly vertical In the vicinity of V  0.7V/

##### 3.1 Ideal Diodes Forward bias (on) Reverse bias (off)

leakage current IS  1nA -VZ is the reverse voltage at which the diode breaks down. VZ is the Zener voltage in a Zener diode (controlled breakdown). Otherwise, VZ is the peak inverse voltage (PIV) IS Forward bias region For Silicon diodes, very little current flows until V  0.5V At V  0.7V, the diode characteristics are nearly vertical In the vicinity of V  0.7V, a/

Be in a circuit where current is less than Izmax Note:- If a zener diode is forward-biased, it operates in the same way as a rectifier diode does. V / I Characteristics Vz = Zener breakdown voltage Izmin = Minimum current to sustain zener breakdown Izmax = Maximum zener current limited by maximum power dissipation For an ideal zener diode, the voltage does not change once it goes into breakdown. It means/

##### BTEC-Electronics Chapter 1 Semiconductor diodes Slide - 1 1.1 Types of material 1.2 Semiconductor materials 1.3 Conduction in semiconductor materials 1.4.

rectifier Figure 1.14 Rectifier BTEC-Electronics Chapter 1 Semiconductor diodes Slide - 21 1.9 Zener diodesZener diodes are heavily doped silicon diodes that, unlike normal diodes, exhibit an abrupt reverse break down at relatively low voltages (typically less than 6V). ◆ Zener diodes are available in various families (according to their general characteristics, encapsulations and power ratings) with reverse breakdown (Zener) voltages in the range 2.4V to 91V. Figure/

##### Zener diodes General description: Stabilitron (Zener) diodes are designed to stabilize or reduce voltage. It is a special kind of diode which permits.

dynamic resistance whose value changes with the change of voltage stability f) Temperature ratio voltage stabilization factor - aUz. The V-I characteristics Zener diode The V-I characteristics UZ – breakdown voltage UF – forward voltage IR – reverse current Examples of Zener diode stabilization Zener diodes are used to regulate voltage across small circuits. Zener diodes are often used as stable references for more advanced voltage regulator circuits. diagram c) Current-voltage/

##### ZENER DIODE / BREAKDOWN DIODE

temperature Positive value of TC indicates increase in VZ with increase in temperature while when TC is negative VZ decreases with increase in temperature. V-I CHARACTERISTIC OF ZENER DIODE (In mA) Leakage current (In V) Zener current The forward characteristic is similar to normal PN Junction diode. On gradually increasing the reverse biasing , the junction breaks down at a specific well defined voltage known as/

and the maximum V D equals E. The point where the load line and the characteristic curve intersect is the Q-point, which identifies I D and V D for a particular diode in a given circuit. Quiescent point (abbreviated “Q- pt.”) to reflect its “still/New Jersey 07458 All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Example For the following Zener diode network, determine V L, V R, I Z, and P Z. Copyright ©2009 by Pearson Education, Inc. Upper Saddle River,/

##### Diodes, Triodes, Thermistors, Opto-isolators, & Phototransistors ME 6405 – Spring 2005 Danny Nguyen Wei Tan Qiulin Xie.

Diodes – Danny Triacs & Thermistors – Qiulin Opto-isolators & Phototransistors – Wei Diodes: Overview Meet the Diode Junction Diodes Analysis and Applications Zener Diodes and Applications What is a Diode? Simplest semiconductor device Allows current to flow in one direction but not the other Symbols: Junction Diodes/ to permanent decalibration. Thermistor Probe One of many available probe assemblies Thermistor Characteristics Most thermistors have a negative temperature coefficient (NTC); that is, their /

##### Diodes Analog Electronics UNIT III. Diodes UNIT I Objective The student will use diodes, capacitors, regulators and LEDs through a rectifying system in.

. When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diodes reverse breakdown voltage UNIT 3. Diodes ELECTRICAL CIRCUITS Voltage Regulators Characteristic curve of zener The zener Works in the breakdown zone, in one point which is called zener voltage (Vz). If the voltage is much higher tan the Vz voltage then an avalanche/

##### Electronics Principles & Applications Fifth Edition Chapter 3 Junction Diodes ©1999 Glencoe/McGraw-Hill Charles A. Schuler.

0 2 4 6 20 40 60 80 100 120 140 Reverse bias in Volts Reverse current in mA A zener diode is designed to break down and conduct backwards at lower voltages. 0 2 4 6 20 40 60 80 100/ containing an LED and a photo- diode is the ________. optocoupler A tuning diode shows less capacitance as reverse bias ________. increases The device that is often used to regulate voltage is the ________ diode. zener REVIEW The PN Junction Characteristic Curves of Diodes Diode Lead Identification Diode Types and Applications

##### 1 7. Design of BJT, Op. Amp., IC Regulated Power Supplies 7.1Zener diode and Zener Regulator DesignZener diode and Zener Regulator Design 7.2Zener regulated.

7.5IC Regulator DesignIC Regulator Design EE3601-07 Electronics Circuit Design 2 7.1Zener diode and Zener regulator design Zener diode Regulated power supply = output dc is constant (stable) at different loads or at varying ac supply conditions = battery source characteristics EE3601-07 Electronics Circuit Design 3 V Smin to V Smax Zener current will becomes less I Zmin at V Smin and it will increase/

##### CHAPTER 17 DIODES AND APPLICATIONS. HALF-WAVE RECTIFIERS The basic DC power supply –The dc power supply converts the standard 220 V,50 Hz into a constant.

an ac signal Diode Clampers ZENER DIODES The zener diode is a silicon pn junction device and operate in the reverse breakdown region symbol Zener Breakdown (V z ) Two types of reverse breakdown in a zener diode –Avalanche also occures in the rectifier diodeZener Occurs in a zener diode at low reverse voltages NOTE : Zeners with breakdown voltage of 1.8 to 200 V are commercially available Breakdown Characteristic Zener Equivalent Circuit Zener diode impedance The/

##### Chapter1: Diodes 1.

and V in the circuit sedr42021_0306a.jpg Figure 2.6 Circuits for Example 3.2. Zener Diode Figure 2.20 Circuit symbol for a zener diode and its Model. sedr42021_0320.jpg Figure 2.21 The diode i–v characteristic with the breakdown region shown in some detail. Application: 1- (a) For the Zener diode network, determine VL, VR, IZ, and PZ. (b) Repeat part (a) with RL = 3/

##### Electronics Overview Basic Circuits, Power Supplies, Transistors, Cable Impedance diode bridge.

2012 UCSD: Physics 121; 2012 16 The Zener Regulator Zener diodes break down at some reverse voltageZener diodes break down at some reverse voltage –can buy at specific breakdown voltages –as long as some current goes through zener, it’ll work –good for rough / near speed of light Question: what is the ratio of voltage to current?Question: what is the ratio of voltage to current? –because this is the characteristic impedance Answer: Z 0 = sqrt(  L/  C) = sqrt(L/C) = (1/2π)sqrt(μ/ε)ln(b/a)Answer: Z 0 =/

##### PN Junction Diode ENGI 242 ELEC 222. January 2004ENGI 242/ELEC 2222 PN Junction Diode Diode Model Analysis –Ideal –Approximation –Exact Diode Specification.

using Loadlines –Analytical Analysis using KVL and KCL LEDs Zener Diodes Diode Resistance –Static Resistance R D –Dynamic Resistance r d –Average Resistance r dav Diode Characteristic Curves Simulation January 2004ENGI 242/ELEC 22224 Series Diode Configuration January 2004ENGI 242/ELEC 22225 Drawing a Load Line to Find the Q Point. January 2004ENGI 242/ELEC 22226 Diode Circuit and Characteristics. January 2004ENGI 242/ELEC 22227 Load Line Example/

##### Lecture 6 & 7 Diode Models (to be continued) Zener diode

manufactured to operate specially in the breakdown region. Such diodes are called breakdown diodes or zener diodes. i-v curve for normal Si diode Farzana R. Zaki CSE 177/ EEE 177 i-v characteristic curve of zener diode Farzana Rahmat zaki i-v characteristic curve of zener diode Farzana R. Zaki CSE 177/ EEE 177 Zener diode For currents greater than knee current Izk , the i-v curve is almost constant. The manufacturer/

##### Diode Circuits Chapter 3 Dr.Debashis De Associate Professor

on the characteristics of the diode Change of Q-point with changes in supply voltage and load LOAD LINE AND Q-POINT Change of Q-point with changes in supply voltage and load Load line ZENER DIODE AS VOLTAGE REGULATOR A Zener diode can be/of an unregulated power supply to provide a constant output voltage free of ripple components. The input current: Zener regulation of a variable input voltage ZENER DIODE AS VOLTAGE REGULATOR There are two types of regulation: (i) Regulation with varying input voltage, also /

##### Fundamentals of Microelectronics

/invert the negative half cycle of input and D3 and D4 pass the positive half cycle. CH3 Diode Circuits Input/Output Characteristics of a Full-Wave Rectifier (Constant-Voltage Model) The dead-zone around Vin arises because Vin must/output. Three diodes operate as a primitive regulator. CH3 Diode Circuits Voltage Regulation With Zener Diode Voltage regulation can be accomplished with Zener diode. Since rd is small, large change in the input will not be reflected at the output. CH3 Diode Circuits Line /

the maximum V D equals E. The point where the load line and the characteristic curve intersect is the Q-point, which identifies I D and V D for a particular diode in a given circuit. Copyright ©2009 by Pearson Education, Inc. Upper Saddle /07458 All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Zener Resistor Values 21 If R is too large, the Zener diode cannot conduct because the available amount of current is less than the minimum current rating, I ZK./

##### 1 SEMICONDUCTORS Tunnel an Varactor Diodes. 2 SEMICONDUCTORS PN diodes and zener diodes have lightly doped PN junctions and similar V-I characteristics.

1 SEMICONDUCTORS Tunnel an Varactor Diodes 2 SEMICONDUCTORS PN diodes and zener diodes have lightly doped PN junctions and similar V-I characteristics. Tunnel diodes are heavily doped and very different from PN and zener diodes PN diodes and zener diodes have lightly doped PN junctions and similar V-I characteristics. Tunnel diodes are heavily doped and very different from PN and zener diodes 3 SEMICONDUCTORS Tunnel diodes have a high internal barrier voltage and a narrow/

##### Diodes TEC 284.

Reverse Voltage (PRV) Breakdown voltage varies from one type of diode to another Zener Diode Diodes can be manufactured so that breakdown occurs at lower and more precise voltages These are called Zener diodes At the Zener voltage a small current will flow through the diode The current must be maintained to the keep the diode at the zener point Zener Diode Zeners are used to maintain constant voltage at some point in/

##### SEMICONDUCTOR DEVICES. Diodes as a semiconductor devices Symbol and Structure Diodes is made by joining p-types and n- types semiconductor materials.

source, V. Its will decreases the depletion region. I-V Characteristic Curve for silicon Diode Zener Diode Zener Diode symbol and I-V Characteristics Zener Diode is used in its i. reverse bias or reverse breakdown mode  Diodes anode connects to the negative supply.  From the I-V characteristics its show that the zener diode has a region in its reverse bias characteristics of almost a constant negative voltage regardless of the value of/

##### Diode Applications Chapter 2 Boylestad Electronic Devices and Circuit Theory.

the maximum V D equals E. The point where the load line and the characteristic curve intersect is the Q-point, which identifies I D and V D for a particular diode in a given circuit. Electronic Devices and Circuit Theory Boylestad © 2013 by Pearson / 2013 by Pearson Higher Education, Inc Upper Saddle River, New Jersey 07458 All Rights Reserved Ch.2 Summary Zener Resistor Values If R is too large, the Zener diode cannot conduct because I Z < I ZK. The minimum current is given by: The maximum value of /

##### Lecture – 4 Full wave rectifier Mathematical Exercise of Full wave rectifier. Special purpose Diode ( Zener Diode ) Mathematical exercise of Zener Diode.

load resistance is 980 Ω. Find : (i) the mean load current (ii) the r.m.s. value of load current Special Purpose Diode ( Zener Diode ) Definition: A properly doped crystal diode which has a sharp breakdown voltage is known as a zener diode. Zener Diode ( Cont. ) Characteristics of Zener Diode: (i) A zener diode is like an ordinary diode except that it is properly doped so as to have a sharp breakdown voltage. (ii) A/

##### Diodes 1.

Edition Sedra/Smith sedr42021_tb0307.jpg Table 3.1 (Continued) Microelectronic Circuits - Fifth Edition Sedra/Smith sedr42021_0320.jpg Figure 3.20 Circuit symbol for a zener diode. Microelectronic Circuits - Fifth Edition Sedra/Smith sedr42021_0321.jpg Figure 3.21 The diode i–v characteristic with the breakdown region shown in some detail. Microelectronic Circuits - Fifth Edition Sedra/Smith sedr42021_0322.jpg Figure 3.22 Model for the/

##### DAC, Diodes and TRIACS Paragkumar Thadesar James “Ryan” Cole

Size Forward Biased n p if Depletion Region Original Size n p Reverse Biased V V Diode Characteristic Curve conduction region non-conduction Ideal Curve Ideal Diode – no resistance to current flow in the forward direction and infinite resistance in the reverse direction. Zener Diode Zener diodes operate in the breakdown region. Zener diodes have a specified voltage drop when they are used in reverse bias. Every p-n/

##### Microelectronic Circuits Zhou Lingling

. SJTU Zhou Lingling Breakdown Mechanisms Remember: pn junction breakdown is not a destructive process, provided that the maximum specified power dissipation is not exceeded. SJTU Zhou Lingling Zener Diode Circuit symbol The diode i–v characteristic with the breakdown region shown in some detail. SJTU Zhou Lingling Junction Capacitance Diffusion Capacitance Depletion capacitance Charge stored in bulk region changes with the change of voltage/

##### Diodes 1. Copyright  2004 by Oxford University Press, Inc. Microelectronic Circuits - Fifth Edition Sedra/Smith2 Figure 3.1 The ideal diode: (a) diode.

/Smith38 Copyright  2004 by Oxford University Press, Inc. Microelectronic Circuits - Fifth Edition Sedra/Smith39 Figure 3.20 Circuit symbol for a zener diode. Copyright  2004 by Oxford University Press, Inc. Microelectronic Circuits - Fifth Edition Sedra/Smith40 Figure 3.21 The diode i– v characteristic with the breakdown region shown in some detail. Copyright  2004 by Oxford University Press, Inc. Microelectronic Circuits - Fifth Edition Sedra/

##### Special Diodes. Describe and analyze the function and applications of:  Zener Diodes.

and applications of:  Zener Diodes  A zener diode is a diode with a defined value of reverse breakdown voltage  A zener is used in reverse breakdown mode  The voltage across a zener is more or less independent of the current through it  The function of a zener is to provide a voltage reference or regulation in a circuit Some important zener characteristics:  Nominal Zener Voltage : 5.1V zener, 12V zener, etc.  Maximum current/

##### Semiconductors Crystalline solid materials whose resistivities are values between those of conductors and insulators. Good electrical characteristics and.

the current will increase very rapidly for a small voltage change. Voltage Regulation This characteristic of the zener diode is very useful for voltage regulation circuits. The zener diode provides an effective way to clamp or limit the voltage at a relatively constant value thus creating a voltage regulation capability. Photo Diodes and LEDs Photodiodes convert incident radiation to electric current. The sun’s radiation creates/

##### Chapter 1 : Diodes Gopika Sood Assistant Professor in Physics PGGovt College For Girls Sector -11, Chandigarh.

and hence a very low capacitance therefore, it is suitable for use in high frequency, like microwave, circuits. V I V-I CHARACTERISTIC OF DIODE ZENER DIODE Zener diodes are specifically designed diodes which operate under reverse breakdown conditions. Mechanism responsible for the working of Zener diode are Avalanche breakdown: When a p-n junction is reverse biased, the minority charge carriers flowing through the junction acquire kinetic energy/

##### Diodes and Diode Applications Topics Covered in Chapter 27 27-1: Semiconductor Materials 27-2: The PN Junction Diode 27-3: Volt-Ampere Characteristic Curve.

illustrates a volt-ampere characteristic curve of a silicon diode. 27-4: Diode Approximations  Three different approximations can be used when analyzing diode circuits.  The one/Diodes  Besides rectification, a semiconductor diode has many other useful applications.  Semiconductor diodes can be manufactured to regulate voltage or emit different colors of light.  Examples of two special purpose diodes are  Light-emitting diodeZener diode 27-7: Special Diodes  A light-emitting diode (LED) is a diode/

##### Copyright  2004 by Oxford University Press, Inc. 1 Diode Circuits.

Oxford University Press, Inc. 22 Table 3.1 (Continued) Copyright  2004 by Oxford University Press, Inc. 23 Figure 3.20 Circuit symbol for a zener diode. Copyright  2004 by Oxford University Press, Inc. 24 Figure 3.21 The diode i– v characteristic with the breakdown region shown in some detail. Copyright  2004 by Oxford University Press, Inc. 25 Figure 3.22 Model for the/

##### Diodes and Diode Circuits. Diode Characteristics A diode is simply a pn junction, but its applications are extensive in electronic circuits. Three important.

AM (amplitude modulation) detector circuits in radio receivers. 21 Special Diodes There are many diodes that have special properties that are useful in electronic circuits. A zener diode is much like a standard diode in many respects, except it is designed to operate in the reverse breakdown region of its operating curve. 22 Basic Zener Characteristics Zener diodes are operated in their reverse breakdown mode to provide voltage regulation/

##### © 2000 Prentice Hall Inc. Figure 3.1 Semiconductor diode.

Hall Inc. Figure 3.28 See Example 3.5. © 2000 Prentice Hall Inc. Figure 3.29 Zener diode characteristic for Example 3.5. © 2000 Prentice Hall Inc. Figure 3.30 See Exercise 3.13. © 2000 Prentice Hall Inc. Figure 3.31/Figure 3.54 Circuit used to display the V - I characteristics of the 1N750 Zener diode. © 2000 Prentice Hall Inc. Figure 3.57 SPICE generated plot for the 1N750 Zener diode at 25°C. © 2000 Prentice Hall Inc. Figure 3.59 1N750 characteristics for temperature ranging from 0 to 100°C in 25° /

##### 1 Lecture 2: Semiconductor Diodes The pn Junction Diode Rectifiers Power Supplies Diode Clippers Diode Clampers Diode Thermometer.

Junctions 5 Figure 9.8, 9.9 Semiconductor Diode i-v Characteristic Semiconductor Diode Circuit Symbol 6 Common Diode The first diode in the previous Figure is a semiconductor diode which could be a small signal diode. Notice the straight bar end has the letter /9.13, 9.14 Circuit containing ideal diodeAssuming that the ideal diode conducts Assuming that the ideal diode does not conduct 13 Zener Diode The second of the diodes is a zener diode which are fairly popular for the voltage regulation of low current/

##### SPECIAL PURPOSE DIODES Chapter 5 & Lecture 5 & 6.

both R L and R S >> R Z : V R(out)  RZRZ RSRS V R(in) ZENER DIODE RATINGS Maximum power = P Z(max) = V Z I Z(max) Available tolerances: 20, 10 and 5 percent Zener resistance, R ZT, increases at the knee of the characteristic curve A derating factor such as 3.2 mW per degree for temperatures above 50 degrees Celsius/

##### Diode Circuit Analysis ENGI 242 ELEC 222. 1 February 2005ENGI 242/ELEC 2222 Diode Circuit Analysis –Graphical Analysis using Loadlines –Analytical Analysis.

ENGI 242 ELEC 222 1 February 2005ENGI 242/ELEC 2222 Diode Circuit Analysis –Graphical Analysis using Loadlines –Analytical Analysis using KVL and KCL LEDs Zener Diodes Diode Resistance –Static Resistance R D –Dynamic Resistance r d –Average Resistance r dav Diode Characteristic Curves Simulation 1 February 2005ENGI 242/ELEC 2223 Series Diode Configuration 1 February 2005ENGI 242/ELEC 2224 Drawing a Load Line to Find the Q/

##### Chapter 3 – Diodes Introduction Textbook CD

the dc analysis [the circuit in (c)] from the signal analysis [the circuit in (d)]. The Small-Signal Model Circuit symbol for a zener diode. Zener Diode - Characteristics The diode i-v characteristic with the breakdown region shown in some detail. Model for the zener diode. 6.8 –V, 10mA 0.5W, 6.8-V, 70mA Vz = Vzo + r2Iz Vz > Vzo Block diagram of a dc power supply. Rectifier/

##### Electronic Circuits Laboratory EE462G Lab #4 DC Power Supply Circuits Using Diodes.

voltage fluctuations.  A voltage regulator circuit is used to limit changes in output voltage.  A Zener diode can be used in a voltage regulator circuit by taking advantage of the Zener diode’s reverse breakdown characteristic.  The regulators resistor, Rreg, limits the current through the Zener to reduce dissipated power. Zener diode Forward BiasReverse Bias Ideal approximation: Short Circuit Ideal approximation: Open Circuit Knee VDVD IDID VZVZ Regulation/

##### 1 © Unitec New Zealand APTE 5601 &DE4401 S EMICONDUCTORS A TOMIC S TRUCTURE DIODES.

= AC input 27 © Unitec New Zealand Bridge Smoothing Capacitor 28 © Unitec New Zealand ZENER Diodes – Voltage Regulators 29 © Unitec New Zealand Reminder - Voltage divider formula 30 © Unitec/ZENERs to CLIP sine-waves 35 © Unitec New Zealand Using Normal Diodes to Clip Sine-waves 36 © Unitec New Zealand BIASED Clipping 37 © Unitec New Zealand PhotoVoltaic (PV) diode cell 38 © Unitec New Zealand PV BYPASS Diodes –prevent backflow from other shaded PVs or full battery 39 © Unitec New Zealand LED Characteristics/

##### Zener Diode and Zener Regulator Electronic Design Laboratory.

Electronic Design Laboratory Overview Reverse Breakdown Specification Zener Diode I-V Characteristics Thermal Characteristics Regulation of Zener Regulator Avalanche Effect Acceleration in electric field Impact-ionization process Zener Effect Heavily doped diode Narrow depletion region Tunneling between valance band and conduction band. “Rips electrons out by their roots.” Specification for 1N754A P TOT = 500mW V Z = 0.8 V @ 20 mA I /

##### Chapter 2 ZENER DIODE. Zener diodes The breakdown characteristics of diodes can be tailored by controlling the doping concentration – Heavily doped p.

Chapter 2 ZENER DIODE Zener diodes The breakdown characteristics of diodes can be tailored by controlling the doping concentration – Heavily doped p + and n - regions result in low breakdown voltage (Zener effect) Used as reference voltage in voltage regulators I V Region of operation Region of operation Region of operation ZENER DIODE Basic Zener regulator V i and R L Fixed and If V≥V Z and Iz >Izmin that means the Zener diode is on or If V

##### NAME: NITHIN GEORGE PALLIPATT E.N- 130540111021 BRANCH-EC(3rd) SUBJECT- ELECTRONICS DEVICE AND CIRCUIT PROJECT TITLE- DIFFERENT TYPES OF DIODES DARSHAN.

(3rd) SUBJECT- ELECTRONICS DEVICE AND CIRCUIT PROJECT TITLE- DIFFERENT TYPES OF DIODES DARSHAN INSTITUTE OF ENGINEERING & TECHNOLOGY, HADALA Different Types of Diode: 1) PN JUNCTION DIODE 2) BACKWARD DIODE 3) BARITT DIODE 4) LASER DIODE 5) LIGHT EMITTING DIODES 6) PHOTODIODE 7) PIN DIODE 8) SCHOTTKY DIODES 9) STEP RECOVERY DIODE 10) TUNNEL DIODE 11) VARACTOR DIODE OR VARICAP DIODE 12)ZENER DIODE PN Junction: The standard PN junction may be thought of as the/