Ppt on zener diodes

Semiconductor Diodes Chapter 1 Boylestad Electronic Devices and Circuit Theory.

Theory Boylestad © 2013 by Pearson Higher Education, Inc Upper Saddle River, New Jersey 07458 All Rights Reserved Ch.1 Summary Other Types of Diodes Zener diodes Light-emitting diodes Diode arrays There are several types of diodes besides the standard p-n junction diode. Three of the more common are: Electronic Devices and Circuit Theory Boylestad © 2013 by Pearson Higher Education, Inc Upper Saddle River, New Jersey/


Chapter 1: Semiconductor Diodes. Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices.

by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Other Types of Diodes Zener diode Light-emitting diode Diode arrays 32 Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis/


Chapter 1: Semiconductor Diodes. Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices.

by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Other Types of Diodes Zener diode Light-emitting diode Diode arrays 30 Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis/


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

a particular IzT), rz,Vzk, the manufactures also satisfies the maximum power that the device can safely dissipate. Say, a 0.5W, 6.8V zener diode can operate safely at currents up to a maximum of about 70mA. VZ denotes the point at which the straight line of slope 1/rz intersects/the voltage axis. VZ = VZ0 + IZrZ Farzana R. Zaki CSE 177/ EEE 177 Farzana Rahmat zaki Problem 4(a) A 6.8-V Zener diode in the circuit below is specified to have Vz=6.8V at Iz=5mA, rz=20 ohms, and Izk=0.2mA. The supply voltage is /


Chapter 2: Diode Applications. Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Electronic Devices.

Pearson Education, Inc. Upper Saddle River, New Jersey 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. The minimum current is given by: The maximum value/


Diode Applications Chapter 2 Boylestad Electronic Devices and Circuit Theory.

open circuit Electronic Devices and Circuit Theory Boylestad © 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 resistance is: If R is too small, I Z/


Electronics Devices & Circuits/Unit I/Diodes & its Applications Department of Electronics & Telecommunication Engineering 1DMIETR.

t  T, and T=1/f VP - Vr = Vpexp(-1/fRC) half-wave rectifier (t  T) VP - Vr = Vpexp(-1/2fRC) full-wave rectifier (t  T/2) DMIETR28 Basic Zener Characteristics Zener diodes are operated in their reverse breakdown mode to provide voltage regulation in a circuit. The point where the reverse current begins to increase is called the knee voltage. The current/


Diode Circuits.

RiD+vD=0 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=1.2kW and RL=/6kW. Exercise – find 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=1.2kW and RL=6kW/


Diodes TEC 284.

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/ fluctuates), all other values in the circuit remains the same Only the current flowing through the zener diode changes When determining the value of R for your circuit, start off with the worst case possible/


ZENER DIODE / BREAKDOWN DIODE

voltage i.e. zener voltage (VZ) Operates in breakdown region in reverse bias condition. Zener diode may use avalanche breakdown or zener breakdown mechanism, Fig 1: Zener diode symbol Zener diodes are like ordinary PN junction diode except that it is/ maintain constant output voltage even when either input voltage or load current varies). -Zener diode as reference element (Refer from Boylstead Page 88) LIGHT EMITTING DIODE LED emits light in response to sufficient forward current (IF). Radiated light(in /


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

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/


Diode Fundamentals Chapter 2 Dr.Debashis De Associate Professor

EHP (electron–hole pairs). Consequently the reverse current becomes very large. This type of breakdown phenomena is known as Zener breakdown. Reverse bias with electron tunnelling from p to n leads to Zener breakdown Energy band diagram of a Zener diode I–V characteristics BREAKDOWN DIODE Avalanche Breakdown In a reverse-biased junction, the minority-carriers drift across the depletion region. On their way across/


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

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/


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

2, R = 1k Vss = i R + V D ZENER-DIODE VOLTAGE- REGULATOR CIRCUITS What is a Zener diode? Zener Diodes Diodes that are intended to operate in the breakdown region are called Zener diodes. Breakdown region ZENER-DIODE VOLTAGE- REGULATOR CIRCUITS A voltage regulator circuit provides a nearly constant /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 /


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

Resistor R-2R Ladder Ryan: Discuss Specifications: Reference Voltages Resolution Speed Settling Time Linearity Errors Ryan: Applications Prithviraj: Diodes: Theory and applications Ideal vs. real Types: Junction and Zener Mike: Triacs: Theory and applications Diodes Brief review of semiconductors Junction Diodes Zener Diodes Other type of Junction Diodes Review The conduction band allows the electrons to move within the atomic lattice of the material The valence band/


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

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 under/


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.

to as rectifiers. half-wave rectifier full-wave 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/


Principles & Applications

break down and Reverse bias in Volts 6 4 2 20 40 Reverse current in mA 60 80 100 120 140 A zener diode is designed to break down and conduct backwards at lower voltages. The voltage across a conducting zener is relatively constant. Reverse bias in Volts 6 4 2 20 I V 40 Reverse current in mA 60 80 100 120/


3-1 © 2013 The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Electronics Principles & Applications Eighth Edition Chapter 3 Diodes (student.

reserved. McGraw-Hill 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. 3-24 © 2013 The McGraw-Hill Companies, Inc. All rights /. All rights reserved. McGraw-Hill Unregulated Supply Load The load is in parallel with the zener and will see a relatively constant voltage as long as the zener is conducting. Using a zener diode as a voltage regulator 3-26 © 2013 The McGraw-Hill Companies, Inc. All rights /


McGraw-Hill © 2008 The McGraw-Hill Companies Inc. All rights reserved. Electronics Principles & Applications Seventh Edition Chapter 3 Diodes (student.

rights reserved. 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. McGraw-Hill © 2008 The McGraw-Hill Companies Inc. All rights/ Inc. All rights reserved. Unregulated Supply Load The load is in parallel with the zener and will see a relatively constant voltage as long as the zener is conducting. Using a zener diode as a voltage regulator McGraw-Hill © 2008 The McGraw-Hill Companies Inc. All rights/


Zener effect and Zener diode –When a Zener diode is reverse-biased, it acts at the breakdown region, when it is forward biased, it acts like a normal PN.

-biased, it acts at the breakdown region, when it is forward biased, it acts like a normal PN junction diode Avalanche Effect –Gain kinetic energy – hit another atom – produce electron and hole pair Recall-Lecture 6 Voltage Regulator using Zener Diode 1. The zener diode holds the voltage constant regardless of the current 2. The load resistor sees a constant voltage regardless of the current/


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/


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

the forward direction as normal, but will also allow it to flow in the reverse direction when the voltage is above a certain value - the breakdown voltage known as the Zener voltage. Zener diode Parameters: a) breakdown voltage - UZ b) breakdown current - IZ c) forward bias voltage UF d) reverse current IR e) the dynamic resistance whose value changes with the change of/


10/1/2004EE 42 fall 2004 lecture 141 Lecture #14 Example circuits, Zener diodes, dependent sources, basic amplifiers Reading: 4.10, 5.1, 5.8 Next: transistors.

0.5 V 1 k  10/1/2004EE 42 fall 2004 lecture 1410 Zener diodes A Zener diode is the name commonly used for a diode which is designed for use in reverse breakdown Since the diode breaks down sharply, at accurate voltage, it can be used as a voltage /reference The symbol for a Zener diode: 10/1/2004EE 42 fall 2004 lecture 1411 Zener diode as a simple regulator The Zener diode shown here will keep the regulated voltage equal to its reverse breakdown voltage. ~ /


Oxford University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) Chapter #4: Diodes from Microelectronic Circuits.

. Oxford University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) 4.4. Operation in the Reverse Breakdown Region – Zener Diodes  Under certain circumstances, diodes may be intentionally used in the reverse breakdown region.  These are referred to as Zener Diodes. Oxford University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) 4.5. Rectifier Circuits  One important application/


Oxford University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) Chapter #4: Diodes from Microelectronic Circuits.

University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) 4.4. Operation in the Reverse Breakdown Region – Zener Diodes  Under certain circumstances, diodes may be intentionally used in the reverse breakdown region.  These are referred to as Zener Diodes. Example 4.7 Oxford University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) Example 4.7 (cont.) Oxford/


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

ME 6405 – Spring 2005 Danny Nguyen Wei Tan Qiulin Xie Presentation Outline 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 Start out with Silicon or Germanium (Group IV elements) P-type - doping/


Electronics Overview آشنایی با مهندسی برق diode bridge.

F RC V  Winter 201214 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/are whole circuits in small packages ICs contain resistors, capacitors, diodes, transistors, etc.ICs contain resistors, capacitors, diodes, transistors, etc. note zeners Winter 201216 Transistors Transistors are versatile, highly non-linear devicesTransistors /


EENG 3510 Chapter 3 Diodes.

Operation in the Reverse Breakdown Region –Zener Diodes 3. 4 3.4 Operation in the Reverse Breakdown Region –Zener Diodes 3.4.1 Specifying and Modeling the Zener Diode Circuit symbol for a zener diode. 3. 4 Operation in the Reverse Breakdown Region –Zener Diodes 3. 4 3.4 Operation in the Reverse Breakdown Region –Zener Diodes 3.4.4 A Final Remark In recent years, zener diodes are replaced in voltage-regulator design/


SPECIAL PURPOSE DIODES Chapter 5 & Lecture 5 & 6.

-V Z (Volts) -I Z (mA) VZVZ Graph of zener current versus voltage Power supply VZVZ VSVS RSRS RLRL A zener diode voltage regulator This circuit will regulate when the Thevenin voltage facing the zener diode is greater than the zener voltage. V TH = RLRL R S + R L VSVS Power/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 /


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

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 is important for Zener diodes. Neamen Microelectronics, 4eChapter 2-23 McGraw-Hill The Zener diode begins to conduct when V PS = V Z. When V PS ≥ V Z :V /


Zener effect and Zener diode –When a Zener diode is reverse-biased, it acts at the breakdown region, when it is forward biased, it acts like a normal PN.

is forward biased, it acts like a normal PN junction diode Avalanche Effect –Gain kinetic energy – hit another atom – produce electron and hole pair Recall-Lecture 5 Voltage Regulator using Zener Diode 1. The zener diode holds the voltage constant regardless of the current 2. The /with input primary voltage, V p = 80 sin  t and the transformer turns ratio, N 1 /N 2 = 6. If the diode is ideal diode, (V  = 0V), determine the value of the peak inverse voltage. 1.Get the input of the secondary voltage: 80 / 6/


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

Correct assumption (old-style OR gate) +2 +1 + V - I 3.6 Zener diodes Designed to break down at a specific voltage Used in power supplies and voltage regulators When a large reverse voltage is reached, the diode conducts. Vz is called the breakdown, or Zener voltage. Typical use of Zener diode The Zener diode will not usually conduct, it needs Vs > 12.5V to break down Assume/


1 Electronic Circuits VOLTAGE REGULATION. 2 Electronic Circuits THE ZENER REGULATOR;

breakdown voltage occurring at a specified value. THE REMAINDER OF THE UNREGULATED VOLTAGE DROPS ACROSS THE RESISTOR “R” THE ZENER DIODE DROPS CONSTANT VOLTAGE WITHIN THE DESIGN LIMITS THE LOAD RESISTOR “RL” SEES A CONSTANT VOLTAGE REGARDLESS OF CURRENT 4 Electronic/unregulated power supply or variations in the load resistance. The current through the zener will change to keep the voltage to within the design limits. Also called the zener diode turn on current (Izt), it must not fall below a certain limit/


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

-+V- I +3 +2 +1 Find I and V 9 3.6 Zener diodes Designed to break down at a specific voltage Used in power supplies and voltage regulators When a large reverse voltage is reached, the diode conducts. Vz is called the breakdown, or Zener voltage. 10 Typical use of Zener diode The Zener diode will not usually conduct, it needs Vs > 12.5V to break down/


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/


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

temperature ________. increases 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 80 100 120 140 Reverse/ in mA I V V The voltage across a conducting zener is relatively constant. Unregulated Supply Load The load is in parallel with the zener and will see a relatively constant voltage as long as the zener is conducting. Using a zener diode as a voltage regulator V IN V OUT When V /


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/


© 2013 The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill 3-1 Electronics Principles & Applications Eighth Edition Chapter 3 Diodes Charles.

-Hill 3-17 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. © 2013 The McGraw-Hill Companies, Inc. All rights reserved. / reserved. McGraw-Hill 3-19 Unregulated Supply Load The load is in parallel with the zener and will see a relatively constant voltage as long as the zener is conducting. Using a zener diode as a voltage regulator © 2013 The McGraw-Hill Companies, Inc. All rights reserved. McGraw/


Semiconductor Devices II Physics 355. Zener Diodes With the application of sufficient reverse voltage, a p-n junction will experience a rapid avalanche.

by changing the thickness of the layer to which the voltage is applied, zener diodes can be formed which break down at voltages from about 4 volts to several hundred volts. Zener Diodes When forward-biased, Zener diodes behave much the same as standard rectifying diodes: they have a forward voltage drop which follows the "diode equation" and is about 0.7 volts. In reverse-bias mode, they/


Ahmed Mohamed El-Sayed

TiO2 were prepared using spin coating unit as interlayer between NTCDA and NiTTP Preparation of Organic Zener Diode Characterization the Prepared Devices The current–voltage (I–V) characteristics of the fabricated devices were /investigated at room temperature by using a computerized electrometer 6517B under dark condition Our prepared organic zener diode Commercial zener diodes 15volt( with and without TiO2) 15Volt (RD16S ) Breakdown voltage 1.4 μA (without interlayer)and 21/


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/


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

Network Quantities January 2004ENGI 242/ELEC 22231 Network Example January 2004ENGI 242/ELEC 22232 Zener Diode Equivalents January 2004ENGI 242/ELEC 22233 Basic Zener Regulator January 2004ENGI 242/ELEC 22234 Determining the State of the Zener January 2004ENGI 242/ELEC 22235 The Zener Equivalent Circuit Operation January 2004ENGI 242/ELEC 22236 Zener Diode Regulator January 2004ENGI 242/ELEC 22237 Determining V for the Regulator January 2004ENGI 242/


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/


Diode Circuits Chapter 3 Dr.Debashis De Associate Professor

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 used as a voltage regulator because it maintains a constant output voltage even thought he /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 /


Product Portfolio ROHM Electronics. LSIs ● System LSI Discrete Devices ●MOS FET, Transistors, Diodes ●Resistors, Ceramic Caps, Tantalum Caps OPTO Devices.

Conventional V-regulator –Standard logic, OpAmp Products of great focus –Resistor networks –Tantalum (some cases) –Zener, complex diodes –Small signal, digital, complex –SMD LEDs (regular brightness) –LDO, switching regulator –EEPROM, motor driver + power modules + photo ICs, IrDA Diodes Zener Diodes Switching Diodes Schottky Barrier Diodes Rectifier Diodes High frequency Diodes Band switching Diodes PIN Diodes Small signal Rectifier High voltage Low leakage High speed Surface mount, lead type Surface mount/


Chapter1: Diodes 1.

V0 with no load and with V+ at its nominal value Figure 2.23 (a) Circuit for Example 2.8. (b) The circuit with the zener diode replaced with its equivalent circuit model. The -6.8v zener diode in the circuit is specified to have Vz =6.8v at Iz=5.mA. rs=20, and Izk=20mA. The supply voltage V+ is nominally 10v/


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

and the device is said to be reverse biased. 12 Figure 9.12, 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 power supplies. While it is possible to obtain high current/


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

/ELEC 22217 Full Wave Bridge Rectifier 1 February 2005ENGI 242/ELEC 22218 Zener Diode Equivalents 1 February 2005ENGI 242/ELEC 22219 Basic Zener Regulator 1 February 2005ENGI 242/ELEC 22220 Determining the State of the Zener 1 February 2005ENGI 242/ELEC 22221 The Zener Equivalent Circuit Operation 1 February 2005ENGI 242/ELEC 22222 Zener Diode Regulator 1 February 2005ENGI 242/ELEC 22223 Determining V for the Regulator/


Kit Building Class Lesson 3Page 1 The Zener Diode +V F +I F -3-6 123 zener point Constant breakdown voltage The zener diode exhibits a constant voltage.

should be constant. What is the purpose of the resistor in this circuit? Its job is to limit the current flowing through the zener diode: Kit Building Class Lesson 3Page 2 The Bipolar Junction Transistor The transistor is a versatile device usually configured to perform as a switch or as an amplifier. The bipolar junction /


Ads by Google