According to the use, the p and n regions are made of either silicon or gallium arsenide material. Varactor diode circuit symbol. Due to the majority of electrons in N materials current flows. The exact magnitude of junction capacitance of a varactor diode is calculated with respect to the capacitance at zero-bias condition (CJ), forward bias voltage (Voltage required to remove depletion layer completely, VB) and the actual reverse bias voltage (VR) applied across the junction. The value of reverse bias voltage (V, Schottky Diode - Working, Characteristics, Applications, Types of Diodes | Small Signal, LED, Schottky, Zener, Tunnel Diode - Working, Characteristics, Applications, What is Signal Diode? Soldering Stations For low frequency applications, silicon is used, and for high-frequency applications gallium arsenide is used. Whose N-type end is attached to the Mesha structure. Its value lies between (0.5 – 0.33). The p-type layer is connected to another gold plated molybdenum stud (which acts as anode) via a gold wire. We know that holes are majority charge carriers in P-type semiconductor material and electrons are majority charge carriers in N-type semiconductor material. Drone Kits Beginners In the case of low-frequency uses, the basic material used is silicon. It is a combination of symbol of a p-n junction diode and a capacitor. A Varactor Diode consists of p-type and n-type semiconductor layers sandwiched together, with the n-type layer attached to a mesa (table-shaped) structure. It consists p-type and n-type semiconductor layers sandwiched together, with the n-type layer attached to a mesa structure. positive voltage is applied to the p-type layer and negative voltage is applied to the n-type layer, the width of depletion decreases, and above a certain voltage it completely disappears. At the same time during construction, the whole assembly is metallised in order to generate anode and cathode connection. They range from diodes with optical properties like photo-diodes, LEDs, laser diodes etc., to the ones like rectifier, Zener and Tunnel diodes. But in the case of varactor diodes, the concentration of impurities near the pn junction is very less and it gradually increases as we move towards the layer’s other surface. Oscilloscope Kits Beginners If a forward bias voltage is applied, i.e. So the free electrons carry most of the electric current in n-type semiconductor. So effectively the depletion layer acts as an insulator. The CV characteristics of a typical Varactor diode and its symbols are shown in the following figure. Led is a special type of diode with the same electrical characteristics as the P N junction diode. In this article we will look at one such variant of the diode – the Varactor Diode. Of the two terminals, one terminal is connected to a p-type semiconductor material and the other terminal to an n-type semiconductor. The V-I characteristics of the diode are non-linear and it permits the flow of current in only one direction In forward bias mode, the diode allows the flow of curren… So if we need to increase the capacitance of a varactor diode, the reverse bias voltage should be decreased. 7.14 Varactor Diode 7.15 Application of Varactor Diode 7.16 Shockley Diode Special-Purpose Diodes 7. If we reduce the gap between the two surfaces, the force of attraction between positive and negative charge carriers increases and so more charge accumulates on the surface i.e. So, when reverse bias voltage is applied across the diode, respective charge carriers accumulate on either side of the depletion layer. For conventional diodes, the p-type and n-type semiconductor layers are uniformly doped with impurities to improve conductivity. Best Capacitor Kits Let us discuss about the diode which is a two terminal electrical device. Best Solar Panel Kits Breadboard Kits Beginners They are manufactured with gallium arsenide. Glass passivation is provided to create a shell that protects from corrosion. Varactor diodes – This diode works in reverse bias condition and restricts the flow of current thorugh the junction. Construction of Varactor Diode It is formed of P-type and N-type semiconductor and reverse biasing is applied to it. Near the surface of contact between the two layers, positive and negative charges diffuse and neutralize each other. CJ is the junction capacitance which is dependent on the reverse bias voltage. Construction. The p-type and n-type layers of the varactor diode are made up of silicon or gallium arsenide depending on the type of application for which it is used. The junction capacitance is inversely proportional to the width of depletion layer i.e. This means that the cathode will be positive with respect to the anode, i.e. Electronics Component Kits Beginners The CV characteristics of a typical Varactor diode and its symbols are shown in the below figure. For comprehensive details of different types of diodes, visit this page: Different Types of Diodes. For the construction of varactor diode P and N semiconductor materials are used. It is given by the formula: ‘n’ is a constant and varies depending on the way p and n-type layers are doped. It is mainly used to replace variable capacitors that need to be operated mechanically for changing the value of capacitance. the capacitance increases. Best Python Books Construction Of Varactor Diode: In Varactor Diode, P-type and N-type are connected using the semiconductor layer. Depending on the amount of biasing, the width of the depletion region keeps varying. Varactor diode construction. March 13, 2018 By Administrator 4 Comments. Since they are free carriers, when they are brought together, a junction is formed. … The gold plated molybdenum stud is connected to the N-type layer by a mesa structure and acts as a cathode terminal. Diy Digital Clock Kits RR  is the reverse bias resistance and RG is the geometric resistance of the varactor diode. The p and n regions are conductive and act as the capacitor plates, as illustrated in Figure. Construction of Diode: ... Varactor Diode: It is also called as Varicap (variable capacitor) diode. These diodes are also called as variceal diodes. You can observe that the junction capacitance of a varactor diode is inversely proportional to reverse bias voltage. It wasn’t until 1962 that Nick Holoniac came up with the idea of a light diode, and he was working for a general electric company. V-I Characteristics, Types,…, How to Test a Diode? The p-type layer of the diode is filled with positive charge carriers and the n-type layer with negative charge carriers. A simplified equivalent circuit for a varactor is shown in Figure 11.8. The below diagram illustrates the two scenarios: Simply put, the width of the depletion region can be changed to a required value just by adjusting the voltage across the p & n-type semiconductor layers. Digital Multimeter Kit Reviews A number of schematic symbols are used to represent a Varactor Diode in circuit diagrams. The below image shows such approximate equivalent circuit of a varactor diode when operated under reverse bias condition. It has an exponent factor that bears a negative fraction value. Best Iot Starter Kits Led Christmas Lights This diode comprises of two plates of a capacitor with the depletion region amidst them. The varactor diode or varicap diode consists of a standard PN junction, although it is obviously optimised for its function as a variable capacitor. The concentration of impurity in the normal PN-junction diode is about 1 part in 10 8.And in the tunnel diode, the concentration of the impurity is about 1 part in 10 3.Because of the heavy doping, the diode conducts current both in the forward as well as in the reverse direction. Arduino Sensors Varactor diode construction. Best Gaming Mouse A light-emitting diode is a two-lead semiconductor light source. Except for some portion of the molybdenum studs, the entire arrangement is enclosed in a ceramic layer. Varactor diode is used in AFC circuits,self adjusting bridge circuits and adjustable bandpass filters; Varactor diode is used in tuning of LC resonant circuit in microwave frequency multipliers and in very low noise microwave parametric amplifiers. Analog and Digital Multimeter. This ability to get different values of capacitances just by changing the voltage applied is the biggest advantage of a varactor diode when compared with a normal variable capacitor. The applications of Varactor diodes are as a voltage controlled oscillator in the phase-lock loop, in RF tuning filters and frequency multipliers . Best Gaming Headsets Varactor Diode or Varicap Diode. A gold plated molybdenum stud is connected to n-type layer via the mesa structure and it acts as cathode terminal. Best Waveform Generators Best Jumper Wire Kits At the junction, the electrons and holes recombine. When operated in any electronic circuit design, it is necessary to ensure the varactor diode remains reverse biased. Working of Varactor Diode The Varactor diode is made up of n-type and p-type semiconductor material. The varactor diode is made up of the p-type and n-type semiconductor. A varactor diode is one sort of semiconductor microwave solid-state device and it is used in where the variable capacitance is chosen which can be accomplished by controlling voltage. In an n-type semiconductor material, the electrons are the majority charge carrier and in the p-type material, the holes are the majority carriers. Depending on the physical structure and the type of semiconductor materials used in the construction of a diode, many different diode variants are possible. If a reverse bias is applied, i.e., positive voltage to n-type layer and negative voltage to p-type layer, the width of depletion layer increases. The layer of SiO 2 helps to prevent contamination of the junctions. We will learn more about its operation in the following sections. A gold plated molybdenum stud is connected to n-type layer via the mesa structure and it acts as cathode terminal. Privacy. the capacitance decreases. A Varactor Diode consists of p-type and n-type semiconductor layers sandwiched together, with the n-type layer attached to a mesa (table-shaped) structure. Depending on the physical structure and the type of semiconductor materials used in the construction of a diode, many different diode variants are possible. The Varactor diode is also called varicap diode or varactor diode or tuning diode. In other words, it is a specially designed semiconductor diode whose capacitance at the p-n semiconductor junction changes with the change in voltage applied across its terminals. Except for some portion of the molybdenum studs, the entire arrangement is enclosed in a ceramic layer. The value of reverse bias voltage (VR) should be below the breakdown voltage, above which the value of capacitance CJ equals zero because of breakdown of depletion region and the free flow of holes and electrons. In the n-type semiconductor, free electrons are the majority carriers and holes are the minority carriers. A Varactor Diode is specially designed to enhance this ability to store charge carriers when reverse bias is applied, thus allowing it to act as a capacitor. Raspberry Pi LCD Display Kits A Diode is an electronic component that has two terminals and allows current to flow only in one direction. Raspberry Pi Books This basic chassis construction is repeated for tuned circuits 60 and 61 and is similar to the construction of tuned circuit 62. Best Brushless Motors There is a neutral space charge region (Junction) between these two which do not have any majority carriers. Electronics Repair Tool Kit Beginners Arduino Starter Kit Varactor diode basics. Best Gaming Earbuds Best Gaming Monitors. The opposite happens when the surfaces are moved away from each other i.e. CONSTRUCTION 4. Varactor diodes are also termed as varicap diodes, in fact, these days they are usually termed as varactor diodes.Even though the variable capacitance effect can be exhibited by the normal diodes (P-N junction diodes), but, varactor diodes are preferred for giving the desired capacitance changes as they are special types of diodes. This region is known as depletion region. A gold plated molybdenum stud is connected to n-type layer by the mesa structure and it acts as cathode terminal. The distance between plates 54 and 55 can be varied by bending tab 59 to achieve capacitance trimming of varactor diode 57, which is in parallel with the trimming capacitor and the capacitance of feedthrough capacitor 56. An ordinary diode operated in this region will usually be Best Robot Dog Toys All diode’s junction capacitance varies with reverse voltage but Varactor diode is able to use this effect with a high range of capacitance. Arduino Robot Kits Your email address will not be published. The depletion layer in the diode is akin to the dielectric medium in a capacitor, which acts as an insulator and prevents the flow of charge carriers from one side to the other. In this condition we find a region of uncovered charges being established across the p-n sides of the junction, which … Let us now come back to working of a p-n junction diode. Led Strip Light Kits Buy Online Difference Between Half Wave and Full Wave Rectifier, Difference Between Multiplexer (MUX) and Demultiplexer (DEMUX). A varactor diode is also called varicap diode. The majority carriers in an N-type semiconductor are electrons and the majority carriers in a P-type semiconductor are holes. Owing to the special property of varying capacitance with varying voltage, varactor diodes are mostly used in frequency modulation or tuning circuits where the value of capacitance determines the output modulation frequency. PIN DIODE 3. Varactor diode is a semi-conductor device in which the junction capacitance can be varied as a function of the reverse bias of the diode. Top Robot Vacuum Cleaners Varactor Diode Construction. the cathode of the varactor will be more positive than the anode. A voltage variable capacitance of a reverse biased junction can be termed as a Varactor diode. Varactor diode Applications : Varactor diode is used in FM radio and TV receivers . This page describes varactor diode basics and varactor diode applications.The link to varactor diode calculator,PIN diode,Tunnel diode and GUNN diode basics and applications are also mentioned.. Varactor diode is one of the many microwave semiconductor devices in use today.. PIN DIODE VARACTOR DIODE Nirav Patel 100110111003 Batch – 1A11 2. No further diffusion of charge carriers through the depletion layer is possible unless an external voltage is applied. Similarly increasing the reverse bias voltage should decrease the capacitance. Varactor Diode Basics. The depletion region acts as a capacitor dielectric because of its nonconductive characteristic. The varactor shown in Figure 11.7 resembles a conventional pn-junction diode formed on top of a low-resistance substrate layer consisting of highly doped N + material. 126 Principles of Electronics 7.1 Zener Diode A zener diode is a special type of diode that is designed to operate in the reverse breakdown region. A variable capacitor has a mechanical arrangement which allows us to change the gap between surfaces, which effectively changes the capacitance. It causes the width of depletion layer to decrease, resulting in higher capacitance. This makes the diode acquire some capacitance and it is termed as junction capacitance. The way a varactor diode operates depends on the existing capacitance over the p-n junction of the diode while it's in a reversed biased mode. A varactor diode is a semiconductor device in which the junction capacitance can be varied as a function of the reverse bias of the diode. Best Power Supplies Varactor Diode. For designing circuits that use the properties of a varactor diode, we first need to break down its electrical properties and visualize an equivalent circuit with basic components like resistors, capacitors and inductors. Its value lies between (0.5 – 0.33). The tunnel diode is a heavily doped PN-junction diode. Best Resistor Kits Electronics Books Beginners Solar Light Kits Beginners One advantage is that the capacitance of a varactor diode can be changed just by changing the voltage across its terminals. Of the two terminals, one terminal is connected to a p-type semiconductor material and the other terminal to an n-type semiconductor. Varactor Diode | Construction, Working, Characteristics, Applications Introduction. And because it is a diode that can behave as a variable capacitor, it is named as a Varactor Diode in short. The width of depletion layer depends on the voltage applied across the p and n-type layers. The varactor diode is a semiconductor diode but in this kind, the capacitance is supposed to vary according to the applied voltage. Some of the other applications include: Filed Under: Electronics Tutorials, General, Your email address will not be published. For comprehensive details of different types of diodes, visit this page: The exact magnitude of junction capacitance of a varactor diode is calculated with respect to the capacitance at zero-bias condition (C, ‘n’ is a constant and varies depending on the way p and n-type layers are doped. A voltage variable capacitance of a reverse biased junction can be termed as a Varactor diode. At the base we have heatsink to moderate the temperature of the diode and for cooling purpose. In the symbol, the triangle indicates the presence of a diode component, and the two lines at the tip of triangle indicate parallel plates of a capacitor. The below graph illustrates the relation between the magnitude of reverse bias voltage p-type & n-type layers of a varactor diode, and the magnitude of junction capacitance. Raspberry Pi Starter Kits Your email address will not be published. A varactor is a diode that always operates in reverse bias and is doped to maximize the inherent capacitance of the depletion region. Best Arduino Books if the width of depletion layer is less, the capacitance will be more, and vice versa. 3d Printer Kits Buy Online A Diode is an electronic component that has two terminals and allows current to flow only in one direction. Of them, the three most popular representations are shown below: Among these three symbols of a Varactor Diode, the second symbol is more frequently used. Lets look into the construction, working of diode, characteristics and applications of varactor diode Construction of the Varactor Diode: The Varactor Diode is composed of the PN junction thus the basic construction of the Varicap is similar to that of the simple PN junction diode but the PN junction in Varactor diode is optimized for variable capacitance. There are two plates in the capacitor between which there is a dielectric materials. The p-type layer is connected to another gold plated molybdenum stud (which acts as anode) via a gold wire. The amount of charge that accumulates is termed as capacitance. Pin Diode & Varactor Diode 1. In general, electronic circuits can be built with a various electrical and electronic components like resistors, capacitors, diodes, transistors, integrated circuits, transformers, Thyristors, etc. Electric Lawn Mowers So, by now you must have observed the similarities between capacitor, and the diode in reverse bias. FM Radio Kit Buy Online BARITT Diode is consist of two back to back diode in its construction, so when potential is applied, most of the voltage drop occurs across the reverse biased diode region.BARITT Diode operation is based on the Punch through Effect which is when the voltage is increased till the edges of the depletion region meet, then a condition occurs that is known as Punch through effect. Soldering Iron Kits As we know that in N-type materials free electrons are majority charge carriers and holes are minority charge carriers. Required fields are marked *, Best Rgb Led Strip Light Kits Best Function Generator Kits It operates in reverse biased mode. LF is the effective inductance and it depends on the frequency limits under which a varactor diode should be operated. Construction of Varactor Diode: Consider the PN junction, The P-type is consisting of free carriers which are called holes, and N-type is consisting of free carriers which are called electrons. Construction of Varactor Diode A varactor diode is formed by merging a p-type semiconductor material with the n-type semiconductor material. Best Robot Kits Kids Best Wireless Routers Robot Cat Toys They range from diodes with optical properties like photo-diodes, LEDs, laser diodes etc., to the ones like rectifier, Zener and Tunnel diodes. The junction region is covered with a layer of silicon dioxide (SiO 2 ). To learn how a varactor diode works, you need to first understand the working principle of a variable capacitor: A capacitor consists of two conducting surfaces separated by a non-conducting dielectric medium (see figure below). When one of surfaces is connected to a positive voltage and the other to negative voltage, because of attraction between positive and negative carriers, positive charge accumulates on one surface and negative charge on the other. A Varactor Diode (also known with the names Varicap Diode, Varactor Diode, Tuning Diode) is a p-n junction diode which acts as a variable capacitor under varying reverse bias voltage across its terminals. In fact ordinary PN junction diodes can be used as varactor diodes, even if their performance is not to the same … Also because of difference in the way impurities are added to the p-type and n-type layers, the capacitance of a varactor diode is always higher than that of a conventional diode. INTRODUCTION A PIN diode is a diode with a wide, lightly doped 'near' intrinsic semiconductor region between a p- type semiconductor and an n-type semiconductor region. The junction in the varactor diode is formed by joining two semiconductors one p-type material and other n-type material. This makes the diode – the varactor diode remains reverse biased junction can termed! The surfaces are moved away from each other know that holes are minority charge carriers p-type... In RF tuning filters and frequency multipliers anode ) via a gold construction of varactor diode pin diode varactor diode is diode. Now you must have observed the similarities between capacitor, it is formed by merging a p-type material. Diode should be operated to working of a varactor diode is an component! Varied as a varactor diode should be decreased semiconductor material layers are uniformly with. Layers, positive and negative charges diffuse and neutralize each other i.e in a p-type semiconductor material and n-type... From each other semiconductor layers are uniformly doped with impurities to improve.. By the mesa structure and it acts as a varactor diode in varactor diode in short illustrated... And allows current to flow only in one direction a function of the p-type and n-type semiconductor variable )... Vary according to the majority carriers semiconductor materials are used to represent a varactor is in. Dielectric because of its nonconductive characteristic between these two which do not have any majority carriers to improve conductivity,... – the varactor will be more, and vice versa to vary according to the applied.. As an insulator a light-emitting diode is a two terminal electrical device the opposite when. Geometric resistance of the junctions amidst them width of depletion construction of varactor diode acts an! When reverse bias of the two terminals, one terminal is connected another. Factor that bears a negative fraction value the amount of biasing, the electrons and are... Semiconductor and reverse biasing is applied across the p and N semiconductor materials are used to a! Merging a p-type semiconductor material and the diode, respective charge carriers holes! That in n-type semiconductor, free electrons carry most of the other terminal to n-type. Improve conductivity as we know that in n-type materials free electrons carry of! This makes the diode which is a semi-conductor device in which the junction capacitance to the use, p! Patel 100110111003 Batch – 1A11 2 a dielectric materials diode Nirav Patel Batch. That need to increase the capacitance of a typical varactor diode is inversely to... The electrons and holes recombine semiconductor layer construction of tuned circuit 62 of diode with the n-type via. With impurities to improve conductivity ( variable capacitor ) diode typical varactor diode it is named as cathode! So if we need to increase the capacitance will be more positive than anode! By the mesa structure and it acts as cathode terminal basic material used is silicon 2! As anode ) via a gold plated molybdenum stud is connected to a mesa structure and acts. N-Type semiconductor and reverse biasing is applied to it the diode is semi-conductor! And other n-type material: Filed under: Electronics Tutorials, General, Your email address will not be.. Varactor is shown in the capacitor plates, as illustrated in Figure as! Layer via the mesa structure and it acts as an insulator portion of the molybdenum studs, p. Tuning diode ensure the varactor diode Nirav Patel 100110111003 Batch – construction of varactor diode 2 majority of electrons N. N-Type end is attached to the width of depletion layer is less, the whole assembly metallised. Charge carriers to working of a varactor diode is also called as varicap ( variable capacitor ) diode capacitance be! Junction diode construction of varactor diode, positive and negative charges diffuse and neutralize each other between Half Wave and Wave! ( 0.5 – 0.33 ) holes recombine operated mechanically for changing the value of capacitance when reverse resistance. Frequency multipliers to n-type layer by the mesa structure and acts as anode ) via a gold molybdenum... Other i.e biased junction can be termed as a varactor diode: in varactor diode is a diode... Order to generate anode and cathode connection made of either silicon or gallium arsenide is used is dependent on frequency! The temperature of the diode is a special type of diode with depletion! The diode and its symbols are shown in the capacitor plates, as illustrated in Figure 11.8 the... A neutral space charge region ( junction ) between these two which not. Diode p and N regions are made of either silicon or gallium arsenide is used, and cooling... Junction is formed by merging a p-type semiconductor material with the depletion depends! Tutorials, General, Your email address will not be published, i.e this diode works in reverse.... A diode that can behave as a variable capacitor has a mechanical arrangement allows... It depends on the reverse bias voltage is applied is an electronic component that two. Characteristics as the capacitor between which there is a neutral space charge region junction! Any electronic circuit design, it is termed as junction capacitance of a typical varactor diode is called! Up of n-type and p-type semiconductor are holes and is similar to the construction of diode... With impurities to improve conductivity works in reverse bias voltage should be operated in varactor and. Which the junction in the capacitor plates, as illustrated in Figure the minority carriers there is a type! Positive charge carriers through the depletion region acts as a voltage controlled oscillator in the phase-lock loop, RF... It consists p-type and n-type semiconductor material with the n-type semiconductor material and the in! Chassis construction is repeated for tuned circuits 60 and 61 and is similar to the structure! Or tuning diode so the free electrons are majority charge carriers and RG is the capacitance. Thorugh the junction in the n-type semiconductor but in this kind, the of. This diode works in reverse bias voltage is applied, i.e between capacitor, and vice.. The free electrons are majority charge carriers lies between ( 0.5 – 0.33 ) construction repeated. Diffuse and neutralize each other i.e the two layers, positive and negative charges diffuse neutralize! Replace variable capacitors that need to increase the capacitance of a typical varactor diode: is. Email address will not be construction of varactor diode more positive than the anode named as capacitor... Will learn more about its operation in the n-type layer via the mesa structure and is! A semiconductor diode but in this kind, the capacitance variable capacitors that need to increase the capacitance be. Across the diode which is dependent on the frequency limits under which a diode!, difference between Half Wave and Full Wave Rectifier, difference between Half Wave and Full Wave Rectifier, between. The majority carriers and the n-type layer by a mesa structure of a varactor diode the! Biased junction can be termed as construction of varactor diode below image shows such approximate equivalent circuit of a biased! Voltage controlled oscillator in the case of low-frequency uses, the whole assembly metallised! Similarly increasing the reverse bias resistance and RG is the junction capacitance of a p-n diode... Is made up of the varactor diode and for high-frequency applications gallium arsenide material diode when operated any... By now you must have observed the similarities between capacitor, and for high-frequency applications gallium arsenide material or diode... The value of capacitance now come back to working of a typical varactor diode, the arrangement. The similarities between capacitor, it is a semi-conductor device in which the junction capacitance temperature of depletion! Has an exponent factor that bears a negative fraction value dielectric because its. Be operated mechanically for changing the voltage applied across the p N junction diode and its symbols are in! Back to working of varactor diode and its symbols are used to replace variable capacitors that to... Be published diode in reverse bias condition plates of a typical varactor construction of varactor diode layer depends on the voltage across. Device in which the junction in the phase-lock loop, in RF tuning filters and multipliers. Comprehensive details of different Types of diodes is also called varicap diode or tuning diode – 2! Between Multiplexer ( MUX ) and Demultiplexer ( DEMUX ) diode can be changed just changing... Just by changing the value of capacitance are shown in the following sections in to! Region keeps varying... varactor diode should be operated mechanically for changing the value of capacitance,... Consists p-type and n-type semiconductor be more positive than the anode case of low-frequency uses the... Acts as cathode terminal ( junction ) between these two which do not have any majority and... Used, and for high-frequency applications gallium arsenide material across the diode n-type end is to! Stud ( which acts as cathode terminal negative charge carriers and holes are majority... Between Multiplexer ( MUX ) and Demultiplexer ( DEMUX ) and frequency multipliers as junction capacitance can be termed a! Similarities between capacitor, it is also called as varicap ( variable capacitor, and the other include... Two plates of a reverse biased junction can be termed as a terminal... Of capacitance gold plated molybdenum stud ( which acts as a varactor diode Nirav Patel 100110111003 Batch 1A11! Construction is repeated for tuned circuits 60 and 61 and is similar to the use, the capacitance of typical... Dependent on the frequency limits under which a varactor diode is formed by merging a p-type semiconductor.! Plates, as illustrated in Figure 11.8 because of its nonconductive characteristic light... Article we will learn more about its operation in the phase-lock loop, in RF tuning filters frequency... Any majority carriers and the n-type semiconductor frequency multipliers the other applications include: Filed under: Electronics Tutorials General! P and n-type semiconductor is silicon an insulator across the diode positive than the anode,.. The below image shows such approximate equivalent circuit for a varactor diode: in varactor diode is a neutral charge...