Ppt on varactor diode applications

Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. C H A P T E R 4 Diodes (non-linear devices)

the reverse voltage. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Simple diode application: rectifier Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 4./by Oxford University Press, Inc. Other Diode devices: 1.Schottky-Barrier diode (SBD): -Metal anode, semiconductor cothode -Fast switching ON/OFF. -Low forward voltage drop (0.3 – 0.5 V) 2.Varactors: -Capacitance between PN junction -Changing /


Diodes, Transistors and Tubes

requirements are low. Zener Diodes                                                                                                                                                                               Zener Diode Voltage Regulation Varactor Diode Diode’s capacitance changes as applied/ large telephone networks, analog and digital computers, and industrial process control. Although some applications had counterparts using earlier technologies such as the spark gap transmitter or mechanical computers, /


SPECIAL PURPOSE DIODES Chapter 5 & Lecture 5 & 6.

) Varactor symbol A varistor diode can be used to protect line-operated equipment from voltage surges. Power supply VSVS RSRS Current-regulator diode R S can vary over a wide range and the current stays the same. OTHER DIODE TYPES Laser: emits coherent light Step-recovery: snaps off when reverse biased Back: conducts better when reverse biased Tunnel: has a negative resistance region OTHER DIODE APPLICATIONS/


1 SmartRF CC400 / CC900 Single Chip High Performance RF Transceivers Peder Martin Evjen, M.Sc.E.E Field Application Engineer.

260 - 470 US ISM band n 902-928 US ISM band 3 Applications overview n Keyless entry with acknowledgement n Telemetry / remote metering of; l electricity, water, / should be “good Q” n Murata LQN21A or Coilcraft HQ-series n VCO capacitors tolerance n Varactor sensitivity and Q n Crystal tolerance, drift and ageing 24 Crystal oscillator n RF frequency accuracy ~/CC900 has max 4dBm n Insert external amplifier (GaAs, SiGe) n GaAs / PIN diode switch n (insert SAW filter in receive path) 39 Layout n Place VCO in /


CommunicationElectronics Principles & Applications Chapter 5 Frequency Modulation Circuits.

CommunicationElectronics Principles & Applications Chapter 5 Frequency Modulation Circuits subtopics Frequency modulators:  VVC, frequency modulating a crystal oscillator, reactance modulator, voltage/ oscillator. Older FM transmitters used a reactance modulator to vary the carrier frequency. VOLTAGE VARIABLE CAPACITOR (VVC) A VVC or varactor is a silicon diode that when reversed biased acts as a variable capacitor. Varying the reverse bias voltage changes the capacitance. Increasing the voltage decreases /


Metamaterials - Concept and Applications

, Itoh, Electron. Lett., 2000. Electronically Controlled LW Antenna Frequency-independent LW antenna Capable of continuous scanning and beamwidth control Unit cell: CRLH with varactor diode β depends on diode voltage Antenna Feeding Network Itoh et al, EuMC 2005. Refracted Wave Applications Most promising Not much investigated - 2-D, 3-D Negative focusing at an RH–LH interface Anisotropic metasurfaces Parabolic refractors... Current Research... Subwavelength focusing/


electronics fundamentals

manually called Trimmers, padders or tuning capacitors because they are used to make very fine adjustments in a circuit. Varactor diode - A semiconductor that exhibits capacitive characteristic; it is adjusted with an electrical signal. Capacitance meter Capacitor labeling Small / is very high c. they are polarized. d. all of the above. Quiz 3. Electrolytic capacitors are useful in applications where a. a precise value of capacitance is required. b. low leakage current is required. c. large capacitance is /


Chapter 3 – Angle Modulation

Application of FM Generation of FM Two major FM generation: Direct method: Frequency of the carrier is varies (deviated) directly by the modulating signal. With direct FM, the instantaneous frequency deviation is directly proportional to the amplitude of the modulating signal. Example circuit: FM Reactance modulator Varactor diode/allocated by the standardization body, which can reduce interference between the adjacent channels. Application of FM Used by most of the field VHF portable, mobile and base radios/


Indirect optical control of microwave circuits and antennas Amit S. Nagra ECE Dept. University of California Santa Barbara.

Illumination of bulk substrates Photogenerated plasma acts as radiating surface Very versatile High optical power requirement Applications of Optical Control Optically reconfigurable synaptic antenna Conductive grid with optically controlled synaptic elements (switches/reactive/ features of the Optically Variable Capacitor (OVC) PV array controls reverse bias voltage across a varactor diode Varactor junction capacitance can be controlled optically No external bias required RF block resistor keeps PV array/


Voltage Controlled Oscillators Prepared by : Yasmin Mohamed Salma fareed Maryam Magdy Supervised by : Dr.Mohamed Abdelghany 1.

as detailed below.  Different doping profiles could be applied to the pn junction of the varactor diode, to achieve certain c-v relations. 8 [1] Abrupt Diodes  For an abrupt varactor diode the doping concentration is held constant, i.e constant doping level as far as reasonably possible.  Disadvantage :  In applications where a linear dependence is required, a lineariser is needed. This takes additional circuitry that/


Voltage Controlled Oscillators 1 High Speed Electronic Circuits April 27, 2016 By:Abanoub Mamdouh Andrew FahimRamez Mamdouh Michael SamirMounir BaselMohamed.

as detailed below. Different doping profiles could be applied to the PN junction of the varactor diode, to achieve certain C-V relations. Varactor diode Abrupt varactors Hyperabrupt varactors Varactors 9 Abrupt Diodes For an abrupt varactor diode the doping concentration is held constant, i.e constant doping level as far as reasonably possible. Disadvantage :  In applications where a linear dependence is required, a linearizer is needed. This takes additional circuitry/


© 2008 The McGraw-Hill Companies 1 Principles of Electronic Communication Systems Third Edition Louis E. Frenzel, Jr.

primarily for frequency- multiplier service include:  Varactor diodes  Step-recovery diodes © 2008 The McGraw-Hill Companies 64 16-4: Microwave Semiconductor Diodes Frequency-Multiplier Diodes: Varactor Diodes  A varactor diode is basically a voltage variable capacitor.  When a reverse bias is applied to the diode, it acts like a capacitor.  A varactor is primarily used in microwave circuits as a frequency multiplier.  Varactors are used in applications in which it is difficult to/


Principles of Electronic Communication Systems

as fast switches at microwave frequencies. Schottky Diode Frequency-Multiplier Diodes Microwave diodes designed primarily for frequency-multiplier service include: Varactor diodes Step-recovery diodes Varactor Diodes A varactor diode is basically a voltage variable capacitor. When a reverse bias is applied to the diode, it acts like a capacitor. A varactor is primarily used in microwave circuits as a frequency multiplier. Varactors are used in applications in which it is difficult to generate/


Principles of Electronic Communication Systems. Chapter 6 FM Circuits.

series or parallel with the crystal. By making the series capacitance a varactor diode, frequency modulation can be achieved. The modulating signal is applied to the varactor diode which changes the oscillator frequency. 6-1: Frequency Modulators Figure 6-/ is a very high- quality frequency demodulator. Originally this discriminator was limited to expensive telemetry and industrial control applications. With availability of low-cost ICs, this discriminator is used in many electronic products. 6-3: Frequency /


Principles of Electronic Communication Systems

series or parallel with the crystal. By making the series capacitance a varactor diode, frequency modulation can be achieved. The modulating signal is applied to the varactor diode which changes the oscillator frequency. 6-1: Frequency Modulators Figure 6-/ is a very high-quality frequency demodulator. Originally this discriminator was limited to expensive telemetry and industrial control applications. With availability of low-cost ICs, this discriminator is used in many electronic products. 6-3: Frequency/


Chapter 6 FM Circuits.

series or parallel with the crystal. By making the series capacitance a varactor diode, frequency modulation can be achieved. The modulating signal is applied to the varactor diode which changes the oscillator frequency. 6-1: Frequency Modulators Figure 6-/ is a very high-quality frequency demodulator. Originally this discriminator was limited to expensive telemetry and industrial control applications. With availability of low-cost ICs, this discriminator is used in many electronic products. 6-3: Frequency/


McGraw-Hill © 2008 The McGraw-Hill Companies, Inc. All rights reserved. Principles of Electronic Communication Systems FM Circuits.

with the crystal.  By making the series capacitance a varactor diode, frequency modulation can be achieved.  The modulating signal is applied to the varactor diode which changes the oscillator frequency. McGraw-Hill © 2008 The McGraw/ or phase- sensitive feedback control circuit used in frequency demodulation, frequency synthesizers, and various filtering and signal-detection applications. PLLs have three basic elements. They are:  Phase detector  Low-pass filter  Voltage-controlled oscillator McGraw/


Principles of Electronic Communication Systems

, therefore the amount of capacitance. All diodes exhibit variable capacitance. Varactors are designed to optimize this characteristic. Varactor Diode Schematic Symbol Varactor Modulator Circuit Varactor Modulator The capacitance of varactor diode D1 and L1 form the parallel tuned / high-quality frequency demodulator. Originally this discriminator was limited to expensive telemetry and industrial control applications. With availability of low-cost ICs, this discriminator is used in many electronic products. /


九十八學年第一學期 科目:電子學(一) 班級:電機二甲、電機二乙 授課教師:章國揚 林正平 九十八學年第一學期 科目:電子學(一) 班級:電機二甲、電機二乙 授課教師:章國揚 林正平.

of analyzing a diode. These are ideal, practical, and complex. Typically we use a practical diode model.   A diode conducts when forward-biased and does not conduct when reverse biased. Chapter 2 Diode Applications Objectives  Explain/loads.   There are other diode types used for specific RF purposes such as varactor diodes (variable capacitance), Schottky diodes (high speed switching), and PIN diodes (microwave attenuation and switching). Summary   Light emitting diodes (LED) emit either infrared or /


FREQUENCY AND PHASE MODULATION (ANGLE MODULATION)

Reactance Modulator – There are a number of devices whose reactance can be varied by the application of voltage. These include FET and BJT, varactor diode etc. If such a device is placed across the tank circuit of the L-C /isolated from modulator, so frequency stability is very good. Disadvantages – 1. Because of nonlinear capacitance Vs. voltage characteristics of varactor diode, there is a distortion in the modulated output waveform. 2. Amplitude of modulating signal should be kept small to avoid /


For further information, see the Courseware Product License Agreement.

Millman, C. C. Halkias, “Integrated electronics”, 1972, McGraw-Hill. [3] R. Ludwig, P. Bretchko, “RF circuit design - theory and applications”, 2000 Prentice-Hall. [4] B. Razavi, “RF microelectronics”, 1998 Prentice-Hall, TK6560. [5] J. R. Smith,”Modern communication circuits”,1998 /. T. Lee, A. Hajimiri, “The design of low noise oscillators”, Kluwer, 1999. More on Varactor Extra The varactor diode is basically a PN junction optimized for its linear junction capacitance. It is always operated in the reverse-/


DESIGN OF ELECTRONIC SYSTEMS Course Code : 11-EC201 DEPARTMENT OF ELECTRONICS & COMPUTER ENGINEERING.

application and in clipping and clamping operations that deal with short-duration pulse waveforms Zener diodes, a special kind of diode that can recover from breakdown caused when the reverse-bias voltage exceeds the diode breakdown voltage. These diodes are commonly used as voltage-level regulators and protectors against high voltage surges Optical diodes Special diodes, such as varactors (diodes with variable capacity), tunnel diodes or Schottky diodes Types of diodes Zener diodes/


Chapter 16 Other Two-Terminal Devices

for diffused junctions VT = maximum reverse bias voltage VR = applied reverse bias voltage 5 Varactor Diode Applications FM modulator Automatic-frequency-control devices Adjustable bandpass filters Parametric amplifiers 6 Power Diodes Power diodes used in high-power and high-temperature applications, such as power rectifier circuits, must be rated for power Power diodes are sometimes referred to as rectifiers They have the same symbol and operation as/


Electronic Components Eng.Mohammed Alsumady

, 7.2 V, 9.6 V etc. Varactor Diode A varactor diode is a silicon diode that works as a variable capacitor in response to a range of reverse voltage values. Varactors are available with nominal capacitance values ranging from 1 to 500 pF, and with maximum rated operating voltages extending from 10 to 100 volts. They mostly find applications in automatic frequency control circuits. In a/


DESIGN OF ELECTRONIC SYSTEMS Course Code : 11-EC201 DEPARTMENT OF ELECTRONICS & COMPUTER ENGINEERING.

application and in clipping and clamping operations that deal with short-duration pulse waveforms Zener diodes, a special kind of diode that can recover from breakdown caused when the reverse-bias voltage exceeds the diode breakdown voltage. These diodes are commonly used as voltage-level regulators and protectors against high voltage surges Optical diodes Special diodes, such as varactors (diodes with variable capacity), tunnel diodes or Schottky diodes Types of diodes Zener diodes/


Chapter 4 : Angle Modulation Transmission and Reception

deviation thus limited use to the low index applications. BENG 2413 Communication Principles Faculty of Electrical Engineering Chapter 4 : Angle Modulation 4.7.1.2 : VCO FM Modulator the use of varactor diode to transform changes in modulating signal amplitude to /for the oscillator : (25) where fc = carrier frequency L = inductance of the primary winding of T1 C = varactor diode capacitance BENG 2413 Communication Principles Faculty of Electrical Engineering Chapter 4 : Angle Modulation 4.7.1.2 : VCO FM /


Oscillators Communication Circuits Prof. M. Kamarei.

as being incremental ground (this is not quite true, but close enough) ●Recognize that we have a diode connected device with a negative transconductance value –Replace with negative resistor ●Note: G m is large signal /of VCOs –Mathematical Model of VCOs –PN Junction VaractorsVaractor Tuned LC Oscillator –Clapp Varactor Tuned VCO –Varactor Tuned Differential Oscillator –MOS Varactors M. Kamarei, Spring 2009 Oscillators64 Voltage-Controlled Osc. ●In most applications we need to tune the oscillator to a /


R. F. Systems EE731 H. Chan; Mohawk College.

depletion region exists. Current is by majority carriers; therefore, very low in capacitance. Semi- conductor Layer SiO2 Dielectric Substrate Metal Electrode Applications: detectors, mixers, and switches. H. Chan; Mohawk College Junction Capacitance Characteristic Varactor Diode Cj Co Circuit Symbol V Junction Capacitance Characteristic Varactors operate under reverse-bias conditions. The junction capacitance is: where Vb = barrier potential (0.55 to 0.7 for silicon/


Heng Chan; Mohawk College

region exists. Current is by majority carriers; therefore, very low in capacitance. Semi- conductor Layer SiO2 Dielectric Substrate Metal Electrode Applications: detectors, mixers, and switches. Heng Chan; Mohawk College Varactor Diode Varactors operate under reverse-bias conditions. Cj Co Circuit Symbol V Junction Capacitance Characteristic Varactors operate under reverse-bias conditions. The junction capacitance is: where Vb = barrier potential (0.55 to 0.7 for/


LECTURE ON AM/FM TRANSMITTER

, the cooling problem is not severe. Punjab Edusat Society COMPARISION BETWEEN LOW-LEVEL AND HIGH-LEVEL MODULATION Applications : Used as higher power broadcast transmitters. Used in TV transmitters. Punjab Edusat Society FM TRANSMITTERS Frequency / the oscillator generator the corresponding FM signal. Punjab Edusat Society DIRECT MODULATORS Few other direct modulators are: Varactor diode modulator. Reactance modulator. V.C.O. modulator. Stabilized reactance modulator. Cross by direct FM transmitters. Punjab/


Government Engineering College, Godhra SUBJECT : Audio and Video System GEC GODHRA.

less, the cooling problem is not severe. GEC GODHRA COMPARISION BETWEEN LOW-LEVEL AND HIGH-LEVEL MODULATION 5. Applications : Used as higher power broadcast transmitters. Used in TV transmitters. GEC GODHRA FM TRANSMITTERS GEC GODHRA Frequency /modulating signal the oscillator generator the corresponding FM signal. GEC GODHRA DIRECT MODULATORS Few other direct modulators are: Varactor diode modulator. Reactance modulator. V.C.O. modulator. Stabilized reactance modulator. Cross by direct FM transmitters. GEC /


Amateur Extra Licensing Class Presented by W5YI Arlington, Texas Components in Your New Rig.

4 Extra Class Question Pool Valid July 1, 2008 Through June 30, 2012 Components in Your New Rig E6A01 In what application is gallium arsenide used as a semiconductor material in preference to germanium or silicon? A.In high-current rectifier circuits B.In/internal capacitance as the voltage applied to its terminals varies? A.Tunnel diode B.Varactor diode C.Silicon-controlled rectifier D.Zener diode E6B06 In Figure E6-3, what is the schematic symbol for a varactor diode? A.8 B.6 C.2 D.1 E6B11 In Figure E6/


MVE MURI 99 Kick-off MeetingR. Barker, Technical Monitor Started 1 May 99 October 1999 High Power Millimeter Wave Grid Array Sources* A novel, broadband.

A novel, broadband quasi-optical frequency multiplier system has been designed, simulated and fabricated for high efficiency, high power millimeter wave applications. Initial proof- of-principle doubler and tripler systems are being tested using a conventional 10 W Ka-band TWT as the / Frequency doubler grid arrays using Schottky varactors fabricated by Martin- Marietta have been tested. C min = 15 fF, C max = 60 fF resulting in C max /C min = 4 R s = R diode + R strip = 6 Ω MVE MURI 99 Kick-off MeetingR/


Electronics Fundamentals 8 th edition Floyd/Buchla © 2010 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved. chapter 16 electronics.

Upper Saddle River, NJ 07458. All Rights Reserved. chapter 16 electronics fundamentals circuits, devices, and applications THOMAS L. FLOYD DAVID M. BUCHLA Electronics Fundamentals 8 th edition Floyd/Buchla Chapter 16 ©/ Saddle River, NJ 07458. All Rights Reserved. Special-purpose diodes Special purpose diodes include Zener diodes – used for establishing a reference voltage Varactor diodes – used as variable capacitors Light-emitting diodes – used in displays Photodiodes – used as light sensors Electronics/


Chapter 5 Problems ECET 214 Prof. Park NJIT.

frequencies ranging from 100 Hz to 3 kHz. c. are found in police, aircraft, taxicabs, weather service, and industrial applications. d. all of the above. Problem 32 The modulation index that occurs when the deviation and intelligence frequencies are maximum /causes a change in the JFET amplifiers input capacitance, which shifts the resonant frequency of a tank circuit. a. varactor diode modulator b. reactance modulator c. VCO modulator d. PLL modulator Problem 46 The main disadvantage of direct FM modulators /


09/16/2010© 2010 NTUST Today Course overview and information.

the application of a voltage. The pn junction is basically a diode, which is a device that allows current in only one direction. A few typical diodes are shown. The PN Junction Diode When /diodes Examples Special-purpose diodes Special purpose diodes include Zener diodes – used for establishing a reference voltage Varactor diodes – used as variable capacitors Light-emitting diodes – used in displays Photodiodes – used as light sensors Special-purpose Diodes Majority carrier Minority carrier PN junction Diode/


Communication Theory (EC 2252)

at the collector. This low freq signal passes through the RF choke (L1) and is applied across the varactor diode. Varactor diode behaves as voltage controlled capacitor. When low reverse biased voltage is applied, more capacitance is generated and thus decrease/ reliably across a channel at rates beyond the channel capacity. Shannon-Hartley theorem or Information Capacity Theorem An application of the channel capacity concept to an additive white Gaussian noise channel with B Hz bandwidth and signal-to/


1 Communication Theory (EC 2252) Prof.J.B.Bhattacharjee K.Senthil Kumar ECE Department Rajalakshmi Engineering College www.Vidyarthiplus.com.

at the collector.   This low freq signal passes through the RF choke (L1) and is applied across the varactor diode.   Varactor diode behaves as voltage controlled capacitor.   When low reverse biased voltage is applied, more capacitance is generated and thus /across a channel at rates beyond the channel capacity. Shannon-Hartley theorem or Information Capacity Theorem   An application of the channel capacity concept to an additive white Gaussian noise channel with B Hz bandwidth and signal-to-noise/


MICROWAVE SOLID STATE DEVICES FARIHA AB. HAMED 031080096 MARZADILAHIKMAH MOHAMAD NOR SAEMI 031080197 WAN NADIRAH ROSLI 031080516.

voltage that can be applied to the device. Bias current : The bias is always reverse. This means that the varactor diode does not conduct electricity. If the bias is turned positive then the device will start conducting. Other criteria to be / width depends on the applied voltage and this makes the capacitance vary with the applied voltage. APPLICATIONS FREQUENCY MULTIPLIERS - used in applications where it’s difficult to generate microwave signals producing relatively high power outputs at frequencies up to/


[1] Gold, G. et al., Proc. ISMRM, 84, 2001. [2] Scott, G. et al., Proc. ISMRM, 20, 2001. [3] Atalar, E. et al., MRM, 36: 596, 1996. [4] Quick, H. et al.,

tuning and matching boxes, work has been done to develop DC-bias tuning methods using varactor diodes closer to the receiver [4, 5]. Clinical applicability would be increased by automation of interventional coil tuning. This work presents a method for push-of-/the tuning elements should be as close as possible to the coil. The schematic and picture below (Figure 1) display a varactor diode tunable receiver. This receiver was used as the coil in the experiments presented here, as well as in previous work [/


Inductance The property of inductance might be described as "when any piece of wire is wound into a coil form it forms an inductance which is the property.

direction, hence the "arrow" appearance. This is one very important property of diodes Types of Diodes The second of the diodes is a zener diode which are fairly popular for the voltage regulation of low current power supplies. Types of Diodes The next is a varactor or tuning diode. Depicted here is actually two varactor diodes mounted back to back with the DC control voltage applied at the common/


John R. Vig Consultant. Most of this Tutorial was prepared while the author was employed by the US Army Communications-Electronics Research, Development.

Time and Timekeeping………………………………….8Time and Timekeeping 9.Related Devices and Applications……………………… 9Related Devices and Applications 10.FCS Proceedings Ordering, Website, and Index…………..10FCS / in the resonator package and the oscillator circuitry. Induced ac voltages can affect varactors, AGC circuits and power supplies. Typical frequency change of a "good" quartz/ atomic energy levels are populated by optical pumping with a laser diode. This method provides superior utilization of Cs atoms, and provides /


Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. MALVINO & BATES SEVENTH EDITION Electronic PRINCIPLES.

. Permission required for reproduction or display. V in V out V in V out Hot-carrier rectifier Schottky diodes eliminate tails at high frequencies. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Varactor diode Exhibits variable capacitance Can tune resonant circuits Applications include radio and television tuning Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Less/


1 Atomic Structure Major parts of an atom. Proton: Protons are positively charged particles found in the atomic nucleus. Protons were discovered by Ernest.

_Depletion region – Junction capacitance – Diode equation 1H _Effect of temperature on reverse saturation current – construction, working 1H, _ V-I characteristics and simple applications of :Junction diode, Zener diode 1H, _Tunnel diode and Varactor diode. Filter considerations 1H. 27 Formation /voltage. Thus its reactance can be varied in a controlled manner with a bias voltage. Varactor diode symbol Varactor diodes are always operated under reverse bias conditions, and in this way there is no conduction. /


MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 UC Davis Millimeter Wave Vacuum/ Solid-State Hybrid Technologies.

have the potential to form low cost, high performance, ultra wide quasi-optical control elements for advanced defense and commercial applications. MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 High Speed Switch /May 99 October 1999 Nonlinear Delay Lines The line has a Bragg cutoff frequency given by: The equivalent circuit of a varactor diode periodically loaded Coplanar Waveguide (CPW) line is shown below: MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor/


EGN 3373 Introduction to Electrical Systems I A Systems Approach to Electrical Engineering Graphics Adapted from “Physical, Earth, and Space Science”,

opposite direction (the reverse biased condition). Chapter 8 - Diodes Linear vs. Non-Linear Elements R, L, C … linear (IV curve) Diodes, transistors … non-linear (IV curve) Diodes – What are they ? Diode or a “p-n” junction Non-linear Semiconductor device Diodes - Applications TYPES … – Light emitting … LED’s (OLEDs) – Photodiodes (solar cells !) – Zener – Tunnel APPLICATIONS – Rectifiers – Voltage regulators – Varactors The diode allows an electric current to pass in one direction/


College Name : Shree Swami Atmanand Saraswati Institute Of Technology(SSASIT)(076) Year : 2 nd year(3 rd sem) EC-2015 Subject Name : Electronic Devices.

diode. The power dissipated by a zener diode at any zener current IZ is given as =. ZENER DIODE APPLICATIONS Zener Regulation with a Varying Input Voltage (No Load Condition) Zener diode regulators are not veryefficient so they are limited to applications/there will be very small change in the output THE VARACTOR DIODE The junction capacitance of diodes change with reverse bias. Diodes designed to be used as voltage controlled capacitors are called varactors. They always work in reverse bias. The depletion /


COMSATS Institute of Information Technology Virtual campus Islamabad

: BJT (Bipolar Junction Transistor) HBT (Heterojunction Bipolar Transistor) P N J U C T I O Rectifiers Zener Diode Junction Diode Varactor Diode Switching Diode Tunnel Diode PN Junction Diode Solar Cell Photo-Diode Photo Detector Light Emitting diode & Laser Diode JFET MOSFET - memory FET (Field Effect Transistor) MESFET - HEMT Common Applications of Diodes: Rectifier Zener LED Schematic symbol Bias for normal operation Switched back and forth between forward and reverse. Reverse/


SUBELEMENT E6 CIRCUIT COMPONENTS [6 Exam Questions - 6 Groups] Circuit Components1.

P-channel 3Circuit Components Transistor Construction 4Circuit Components E6A01 In what application is gallium arsenide used as a semiconductor material in preference to /Varactor diode B. Tunnel diode C. Silicon-controlled rectifier D. Zener diode 46Circuit Components E6B04 What type of semiconductor device is designed for use as a voltage-controlled capacitor? A. Varactor diode B. Tunnel diode C. Silicon-controlled rectifier D. Zener diode 47Circuit Components E6B05 What characteristic of a PIN diode/


John R. Vig US Army Communications-Electronics Research, Development & Engineering Center Fort Monmouth, NJ, USA Approved for public release.

and Timekeeping………………………………….8Time and Timekeeping 9.Related Devices and Applications……………………… 9Related Devices and Applications 10.FCS Proceedings Ordering, Website, and Index…………..10FCS Proceedings/in the resonator package and the oscillator circuitry. Induced ac voltages can affect varactors, AGC circuits and power supplies. Typical frequency change of a "good" / atomic energy levels are populated by optical pumping with a laser diode. This method provides superior utilization of Cs atoms, and provides/


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