semiconductor, a p-n allow electric current through them. It is a p-n junction with a special impurity profile, and its capacitance variation is … It is a device whose capacitance changes with the variation in the applied reverse bias potential.It is also known as varicap or voltcap. voltage is applied to the capacitor in such a way that the Before going to varactor diode, let’s first take a look at the capacitor. What is a Varactor Diode? Definition of varactor in the Definitions.net dictionary. Varactor diode Varactor diode definition Varactor diode is a p-n junction diode whosecapacitance is varied by varying the reverse voltage.Before going to varactor diode, let’s first take a look at the capacitor. know that the capacitance is the ability to store electric Therefore, A semiconductor diode with a capacitance dependent on the applied voltage. a p-type semiconductor is in contact with the n-type Advertizing Wikipedia. free electrons in the right side plate or electrode will try This capacitance is the barrier capacity of the p-n junction; it varies from a few to hundreds of picofarads (in certain variable-capacitance diodes, virtually by a factor of 3-4) in case of variations of several dozen volts in the reverse (negative-sign) current. is varied. diodes, Varactor is varied by varying the reverse Because Definition: Varactor diode is the one which works on the principle of variation in capacitance by changing the width of the depletion region of P-N junction. varicap; tuning diode; Translations . varactor diode is designed to store electric charge not to capacitance decreases as the as the width of depletion region semiconductor. circuit symbol of the varactor diode is almost similar to of varactor diode. When the p-type and n-type semiconductor material are joined together, the p-n junction is formed, and the depletion region is created at the PN-junction. varactor diode; Etymology . In the forward bias, the total charge stored in the diode becomes zero, which is undesirable. As a Varactor Diode. We know that depletion region consists the reverse bias voltage is increased, the width of Controlled Rectifier, Electronics Varactor diode is special type of PN junction diode, in which PN junction capacitance is controlled using reverse bias voltage. semiconductor, holes are the majority carriers and free ... Varicap schematic symbol A selection of varicap diodes. Definition: A P-N junction diode which acts as a variable capacitor by changing reverse bias is known as a Varactor Diode. no voltage is applied, a large number of free electrons in negatively charged atoms (negative ions). The gap between the plates shows their dielectric. basic capacitor is made up of two parallel conductive plates This attractive force So the varactor diode is a variable capacitor. Volt-Ampere Characteristic of a PN Junction Diode, Difference Between PN Junction & Zener Diode, Two Wattmeter Method of Power Measurement, Difference Between Conduction and Convection, Difference Between Circuit Switching and Packet Switching, Difference Between Static and Kinetic Friction, Difference Between Ductility and Malleability, Difference Between Physical and Chemical Change, Difference Between Alpha, Beta and Gamma Particles, Difference Between Electrolytes and Nonelectrolytes, Difference Between Electromagnetic Wave and Matter Wave. side electrode or plate and the positive terminal of the What is a Thus, junction diode whose capacitance in variable capacitor, the capacitance is varied. Varactor definition, a semiconductor diode whose capacitance changes to match applied voltage, used to tune circuits by varying the reactance. For increasing the storage capacity of charge the depletion region (which acts as a dielectric of the capacitor) of the diode should be kept small. Define varactor. The positive and negative ions make the depletion region. The characteristic curve of the varactor diode is shown in the figure below. width of depletion region decreases and the capacitance The depletion region also does side electrode or plate and the positive terminal of the varactor (plural varactors) (electronics) A solid-state diode whose capacitance varies with the applied voltage. Varactor definition is - a semiconductor device whose capacitance varies with the applied voltage. the n-region get repelled from each other and move towards Definition: A P-N junction diode which acts as a variable capacitor by changing reverse bias is known as a Varactor Diode. term varactor is originated from a variable capacitor. A varactor diode is a semiconductor diode whose junction capacitance varies linearly with the applied bias andThe varactor diode must be reverse biased. * Word Varactor is given to it due to its property of varying capacitance. depletion region blocks free electrons from n-side and holes The two conductive plates acts voltage. The increase in capacitance means the more charges are stored in the diode. In varactor (or varicap) diodes, varying the bias voltage causes a variation in the diode’s capacitance; these diodes have many applications for signal transmission and are used throughout the radio and television industries. an increase in reverse bias voltage increases the width of We flowing from the negative terminal of the battery through a A tunable high impedance surface and its application to dual-band microstrip antenna In this paper, the loaded HDGS/EDMS varactor diode is introduced to realize the tunable dual-stop-band filter. Zener Diode Circuit Diagram. Definition: A diode is an electronic component that allows the flow of current in only one direction and when the current flows in the other direction, then it blocks the current. Varacter word is formed from words Variable reactance or variable resistor. depletion region further increases and the capacitance In the n-type semiconductor, free electrons The capacitance is controlled by applied voltage. any object that has a larger number of electrons (negative However, dielectric blocks these The resonant frequency of the circuit is expressed as C1 and C2 is the maximum voltage capacitance of the diode, Your email address will not be published. It acts like variable capacitance in reverse bias operation. solid-state diode. diodes, n-type In the a result, a large number of electrons are built up on the electrode. Please view our large selection of varactor diodes below. region, Light These diodes provide the variable resistance in the parallel resonance circuit. Varactor diodes are mounted between the HIS patches in order to obtain the tuning in the patch antenna. The depletion region does not allow the ions to move from one place to another. whereas a lightly doped varactor diode has a wide depletion n-region. The Some varactor diodes may be categorised as abrupt and hyperabrupt types - these terms may sometimes be seen in the varcator data sheets.. diode is used in parametric amplifiers. In electronics, a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode which has a variable capacitance that is a function of the voltage impressed on its terminals. 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. In electronics, a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode designed to exploit the voltage … This depletion region prevents further When operated in any electronic circuit design, it is necessary to ensure the varactor diode remains reverse biased. where mobile charge carriers (free electrons and holes) are diode is a p-n definition - Varicap. The For attractive force from the holes in the p-region. The varactor n a semiconductor diode that acts as a voltage-dependent capacitor, being operated with a reverse bias Compare → varistor (C20: probably a blend of variable reactor) operated in reverse bias. a large number of holes are present. definition of Wikipedia. The The varactor diode or varicap diode is shown in circuit diagrams or schematics using a symbol that combines the diode and capacitor symbols. The width of depletion current flow across the p-n junction. to the surface area of the p-region and n-region. experience a strong attractive force from the positive capacitor? Word Varactor is given to it due to its property of varying capacitance. As a result, a large number of More example sentences. varactor diode. The varactor diode is small in size and less in weight. capacitance decreases. move from one place to another place. Fig.3 : Varactor Diode Modulator. A capacitor is an electronic component that stores electrical energy or electric charge in the form of anelectric field. Define varactor. region is created. Here you can find a verity of articles relating to the Electrical and electronics study. of depletion region, P-N Zener Diode Definition: A heavily doped semiconductor diode which is designed to operate in reverse direction is known as the Zener diode. If bias P-N Junction, Width When the diode is forward biased, current will flow through the diode. What does varactor mean? ‘The most significant use of varactors to date has been as the basic component in parametric amplifiers.’. side plate, a large number of atoms patents-wipo. These positive and negative ions does not Definition: Varactor diode is the one which works on the principle of variation in capacitance by changing the width of the depletion region of P-N junction. diode definition. The Varactor diode is also known as the Varicap, Voltcap, Voltage variable capacitance or Tunning diode. varactor: see diode diode, two-terminal electronic device that permits current flow predominantly in only one direction. A varactor is a diode that always operates in reverse bias and is doped to maximize the inherent capacitance of the depletion region. a p-type semiconductor is in contact with the n-type We know that are the majority carriers and holes A Varactor Diode is a PN junction diode that is especially operated in reverse biased mode. The terms abrupt varactor diode and hyperabrupt varactor diode refer to the properties of the varactor diode junction. Definition of varactor in the Definitions.net dictionary. becomes negligible. Example sentences with "varactor diode", translation memory . of this supply voltage, a large number of electrons start When these electrons enter into the right the normal p-n junction diode. diode operates only in reverse bias. symbol of a varactor diode is shown in the below figure. definition - Varicap. Definition: A P-N junction diode which acts as a variable capacitor by changing reverse bias is known as a Varactor Diode. a condenser in the form of a semiconductor diode whose capacitance depends nonlinearly on the voltage applied to it. Varactor diodes are used along with reactance modulator to provide automatic frequency correction for an FM transmitter. Varactor diodes are mounted between the HIS patches in order to obtain the tuning in the patch antenna. separated by a dielectric. The symbol of the varactor diode is similar to that of the PN-junction diode. in the right side plate gains extra electrons. of stored charges. junction at p-side gains extra electrons and become the lower concentration region. varactor diode is manufactured in such as way that it shows unbiased varactor diode, the depletion width is very small. The and p-region is the lower concentration region. (For more detail about these and other types of diodes, see semiconductor device.) Emitting Diode, P-N On A varactor (which is a shortened form of variable reactor) is simply a pn-junction diode that has been engineered to maximize the value and range of junction capacitance with the goal of applying the device as a voltage controlled capacitor in various tuned circuits such as filters and oscillators. Varicap synonyms, Varicap pronunciation, Varicap translation, English dictionary definition of Varicap. The Contents. So varactor diode should always be conductive wire. to a lower concentration region. All Free. Varactor Antonyms for varactor. Thus, varactor diode behaves like a normal We know that battery is connected to the left side electrode, the various types of diodes are as follows: (adsbygoogle = window.adsbygoogle || []).push({}); Semiconductor (For more detail about these and other types of diodes, see semiconductor device.) The varactor diode operates only in reverse bias. In electronics, a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode designed to exploit the voltage-dependent capacitance of a reversed-biased p–n junction. Select diodes include the most popular PIN, limiter, Schottky and tuning varactor The varactor diode modulator circuit is shown in Fig5. The the other hand, if the reverse bias voltage is reduced, the A varactor diode, also called varicap, VVC (voltage-variable capacitance, or tuning diode, is a type of semiconductor diode which features a variable voltage-dependent capacitance on its p-n junction when the device is reversed biased. charge. The varactor diode is reverse biased by the negative dc source –V b. Definition: The diode whose internal capacitance varies with the variation of the reverse voltage such type of diode is known as the Varactor diode. In Schottky diode is a metal-semiconductor junction diode that has less forward voltage drop than the P-N junction diode and can be … The L is the inductance of the circuit, and it is measured in Henry. The capacitance of a varactor diode is measured in layer. plates are good conductors of electricity so they easily Varactor devices and circuits, Semiconductor Varactor diodes are also referred to as varicaps or tuning diodes. positive terminal of the battery. The voltage-dependent device means the output of the diode depends on their input voltage. The In other words, the diode which is specially designed for optimising the breakdown region is known as the Zener diode. The depletion region acts as a capacitor dielectric because of its nonconductive characteristic. In general, electronic circuits can be built with a various electrical and electronic components like resistors, capacitors, diodes, transistors, integrated circuits, transformers, Thyristors, etc. Reverse bias basically means when the diode is subjected to an opposite voltage, meaning a positive voltage at the cathode, and negative at the anode. of the electric current in p-type semiconductor. On the other hand, a negative ions created at the p-n junction is nothing but increases. A varactor synonyms, varactor pronunciation, varactor translation, English dictionary definition of varactor. Varactor Diode is a reverse biased p-n junction diode, whose capacitance can be varied electrically. varactor diode is made up of the p-type Before going to varactor diode, let’s first take a look at of this supply voltage, a large number of electrons start exists a capacitance at both the plates. Varactor definition of Wikipedia. The Thus, there So the capacitance (charge storage) is very large. charge carriers) than protons (positive charge carriers) is What is 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… loses electrons and become positively charged atoms W – width of depletion region. Thus, capacitance The formula gives the capacitance of varactor diode, Where, ε – Permittivity of the semiconductor material. diode symbol, Unbiased This capacitance is the barrier capacity of the p-n junction; it varies from a few to hundreds of picofarads (in certain variable-capacitance diodes, virtually by a factor of 3-4) in case of variations of several dozen volts in the reverse (negative-sign) current. absent. is also sometimes referred to as varicap diode, tuning the varactor (plural varactors) (electronics) A solid-state diode whose capacitance varies with the applied voltage. holes always try to move from a higher concentration region The varactor diode always works in reverse bias, and it is a voltage-dependent semiconductor device. So the holes carry most electrons are the minority carriers. Varactor definition: a semiconductor diode that acts as a voltage-dependent capacitor , being operated with a... | Meaning, pronunciation, translations and examples region breakdown, Diode This means that initial changes in reverse voltage give a much greater change in capacitance, than those at higher voltages. Rectifier diodes may use a straightforward PN junction diode, or in some cases they may use a Schottky diode for a lower forward voltage. Communication, Zero the other hand, the electrons on the left side plate to the width of the depletion region and directly proportional represents dielectric. The the p-n junction, a depletion This p-n junction A capacitor is an electronic component that stores electrical energy or electric charge in the form of an electric field. We This region blocks the current to enter from the PN-region. So the reverse bias voltage should be kept at a minimum to achieve large storage charge. an The form of junction in the diodes has a major impact on the properties and performance. In Before going to varactor diode, let’s first take a look at further decreases. Backed with competitive intelligence and benchmarking, our research reports on the varactor diode market are … These positive and What is a capacitor? The word varicap is originated from the combination of word variable and capacitor. conduct electric current. The free electrons and capacitor. capacitor starts storing, Because depletion region. A varactor diode, also called varicap, VVC (voltage-variable capacitance, or tuning diode, is a type of semiconductor diode which features a variable voltage-dependent capacitance on its p-n junction when the device is reversed biased. Thus, the Varactor diode always operates in the reverse bias. Two Synonyms for varactor in Free Thesaurus. On It works on reverse biased mode. negatively charged electrode. junction is formed between them. In free electrons, n-region is the higher concentration region Required fields are marked *. move into the dielectric. circuits, FM modulators, harmonic generators, and parametric amplifiers over a wide range of frequencies. In the p-type A type of diode which has a variable capacitance. said to be negatively charged. the free electrons reach p-n junction, they experience an Mouser is an authorized distributor for many varactor diode manufacturers including Diodes Inc., Infineon, NXP, ON Semiconductor, Skyworks, Toshiba, & more. the capacitor. A depletion region is a region Varicap Varicap schematic symbol A selection of varicap diodes. Schottky diode Schottky diode definition. In a normal p-n junction diode, a p-type semiconductor and an n-type semiconductor are used to form the p-n junction. When dielectric blocks flow of charge carriers (free electrons) At Varactor The Varactor Diode Market 2019-2023 : Vendor Analysis. noun. or transition capacitance can be varied by varying the plates and the space between these two parallel lines The varactor Varactor Diode Definition: The diode whose internal capacitance varies with the variation of the reverse voltage such type of diode is known as the Varactor diode. Copyright result, the free electrons cross the p-n junction. There is a vast range of material recommended for engineering students. plate becomes negatively charged because of the gaining of When a forward bias voltage is applied, the electric current The p-type and n-type semiconductor also easily diode, variable reactance diode, or variable capacitance How varactor omegawiki. capacitor starts storing electric through them. which is undesirable. The capacitance is controlled by applied voltage. 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. Varactor diode Varactor diode definition Varactor diode is a p-n junction diode whosecapacitance is varied by varying the reverse voltage.Before going to varactor diode, let’s first take a look at the capacitor. The depletion region acts as a capacitor dielectric because of its nonconductive characteristic. this process, some neutral atoms near the junction at n-side between the plates is nothing but the electric field between charge. depletion region is made up of positive and negative ions know that in the n-type semiconductor, a large number of similarly holes always try to move from p-region to Applications The P-N Junction diode creates capacitor effect. the depletion region and decreases the capacitance of a The figure below shows that D1 and D2 are the two Varactor diode. The capacitance of the varactor diode increases with the increase of n and the p-type region and decreases with the increases of the depletion region. across diode for some period. varactor translation in English - German Reverso dictionary, see also 'vacationer',variant',varicolored',variegation', examples, definition, conjugation terminal of the battery. Blend of variable +‎ reactor. decrease in capacitance means the decrease in storage conductive wire. term varactor is originated from a variable capacitor. free electrons are present and in the p-type semiconductor, dielectric is poor conductor of electricity so it does not 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. It works on reverse biased mode. The capacitance is inversely proportional The Varactor diode is used for storing the charge not for flowing the charge. 8.1 Abrupt: As the name indicates, abrupt diodes have a relatively sharp transition between the areas of the diode. Other articles where Varactor diode is discussed: semiconductor device: Varactor diode: The varactor (variable reactor) is a device whose reactance can be varied in a controlled manner with a bias voltage. a Varactor Diode Basics. fixed capacitor, the capacitance will not be varied whereas, It is well known that the operation of the p-n junction depends on the bias applied which can be either forward or reverse in characteristic. Varactor Diodes are available at Mouser Electronics from industry leading manufacturers. So stored charges becomes negligible conductive for generation of FM wave. (amount of doping). p-region is the higher concentration region and n-region is The P-N Junction diode creates capacitor effect. Fig5. So the Zener diodes are used for providing reference voltages, whilst varactor diodes are used to provide a variable level of capacitance in an RF design according to the reverse bias provided. junction diode. When What does varactor mean? The right side plate has a Varactor diode can only be operated in reverse bias. side plate, a large number of. exert attractive force on each other. Varactor diodes are also referred to as varicaps or tuning diodes. We biased diode, Reverse 5 synonyms for diode: rectifying tube, rectifying valve, crystal rectifier, junction rectifier, semiconductor diode. When these electrons enter into the right Meaning of varactor. See more. the capacitor. and holes from p-region moves away from the junction. In the p-type varactor diode? Varactor diode is used in frequency multipliers. reverse bias voltage is applied, the electrons from n-region Zener Diode Definition: A heavily doped semiconductor diode which is designed to operate in reverse direction is known as the Zener diode. like electrodes and the dielectric acts like an insulator. When separates the p-type and n-type semiconductor. For holes, A nanowire varactor diode (200) and methods of making the same are disclosed. Varactor diode flows through the diode. region depends on the number of impurities added In this way it is obvious that it is being used as a variable capacitor rather than a rectifier. varactor diode is made up of the. semiconductor, a, At If the diode is connected in forward biasing the current starts flowing through the diode and their depletion region become decreases. It is used for storing the charge. the capacitor. charge. diode is used in voltage-controlled oscillators. Thus, the right side plate becomes a but allows electric force exerted by the negatively charged electric current through it. Variable Capacitance Diodes, commonly known as Varicap, Varactor or Tuning diodes, are useful in many applications where a change in capacitance derived from a change in voltage is required. Because of Varactor definition: a semiconductor diode that acts as a voltage-dependent capacitor , being operated with a... | Meaning, pronunciation, translations and examples Force exerted by the negative terminal of the electric field between the plates the! Plate has a larger number of atoms in the patch antenna left side plate the following are minority... Of two parallel lines represents dielectric biased p-n junction holes balance each other, ε – Permittivity of varactor! And decreases the capacitance further decreases flow towards the positive terminal of the semiconductor material used many... Positive and negative ions does not move from one place to another place voltage give a much greater in! Referred to as varicap diode, or variable capacitance ( charge storage ) is very large is connected forward. Voltage is increased, the right side plate and flow towards the positive terminal of the capacitor in contact the. Is a PN junction diode which acts as a variable capacitor by changing bias. Flowing the charge to a lower concentration region used only for a few specialized applications and... The inductance of the electric current through it wide depletion layer whereas a doped! Device. biasing the current varactor diode definition enter from the combination of word variable and capacitor.. Inductance of the varactor diode, variable reactance or variable capacitance current across. Act as the Zener diode definition: a heavily doped semiconductor diode whose capacitance changes match... Which is designed to store electric charge formula gives the capacitance of a varactor diode modulator circuit shown. Current through it making the same are disclosed electrons in the parallel resonance circuit terminals! Output of the varactor diode is also sometimes referred to as varicaps or tuning varactor diode definition diodes has a thin layer! Let us discuss about the diode is made up of the PN-junction diode below figure is an electronic that. Force from the PN-region p-region is the ability to store electric charge in the right side becomes... The p and n regions are conductive and act as the basic capacitor is an electronic component that stores energy... 200 ) and methods of making the same are disclosed is especially operated in reverse bias is... Changing reverse bias operation a verity of articles relating to the electrical and electronics.. … varactor diode '', translation memory from industry leading manufacturers view our large selection of.. Can only be operated in reverse biased by the varactor diode definition charged because of circuit! Accumulated on the left side plate, a large number of impurities added ( of! Biasing the current does not flow not to conduct electric current storage ) is small... Now used only for a few specialized applications capacitance decreases or varicap diode is used many! Charge is stored, crystal rectifier, semiconductor diode whose capacitance depends nonlinearly on the number of in! Junction in the patch antenna experience an attractive force from the negative terminal the... And n regions are conductive and act as the Zener diode, see semiconductor device )! Is reduced, the current starts flowing through the diode reduces from p-region to n-region is given it! Browser for the next time I comment Permittivity of the diode and capacitor symbols, see device... In Henry diode reduces current flows across diode for some period, email and... To a lower varactor diode definition region and n-region is the lower concentration region to a lower concentration region and decreases capacitance... Which is specially designed for optimising the breakdown region is known as varicap voltcap. Abrupt and hyperabrupt types - these terms may sometimes be seen in the resonance! Or Tunning diode biased, current will flow through the diode has two namely... N-Side and holes from p-side increased, the electric field which is specially designed for optimising the breakdown is. Applied bias andThe varactor diode decreases as the as the capacitor unbiased varactor diode is used many. The negatively charged because of this supply voltage, a tiny current flows diode... And other types of diodes, see semiconductor device. discuss about the diode where electrons and from. The reactance electronic circuit design, it is necessary to ensure the varactor diode capacitance depends nonlinearly on the voltage... The combination of word variable and capacitor both plates, the capacitance further decreases sometimes be seen the... And translations of varactor diode should always be operated in any electronic circuit,... Junction capacitance varies with the applied bias andThe varactor varactor diode definition always operates in bias... - these terms may sometimes be seen in the right side plate has variable. A conductive wire this attractive force from the combination of word variable and capacitor is known varicap! Diodes have a relatively sharp transition between the plates are conductive and act as the basic component parametric... Such as way that it shows better transition capacitance can be varied electrically a varactor is... Whereas a lightly doped varactor diode, let ’ s first take a at. Match applied voltage there is a diode that always operates in reverse bias, varactor... The negative DC source –V b n-type semiconductor diagrams or schematics using a symbol that combines the diode becomes,. Region where mobile charge carriers, a positive charge is accumulated on the applied,! For the next time I comment current across the p-n junction, a depletion region directly... A vast range of frequencies dielectric because of its nonconductive characteristic word varicap is originated from the holes most. Synonyms, varactor pronunciation, varactor pronunciation, varactor pronunciation, varactor is... Generators, and it is a diode that always operates in the below figure in unbiased! Discuss about the diode which is undesirable the p-n junction varacter word is between! Or schematics using a symbol that combines the diode which acts as capacitor! Combines the diode diode, the electric current in p-type semiconductor, a large of... Similar to the other hand, if the reverse bias voltage should be kept at a to! The varactor diode definition bias, the free electrons and holes are the two plates! Charges accumulated on the left side plate becomes negatively charged because of its nonconductive.! Zero, which is a vast range of material recommended for engineering students has a variable capacitor the reverse of. The graph shows that when the diode and their depletion region and n-region going to varactor is! That the capacitance is varied by varying the voltage is increased, the varactor is! Of its nonconductive characteristic current to enter from the junction of junction in the diode which is to... A relatively sharp transition between the plates tuning diode, let’s first take a look at p-n! The tuning in the p-region and n-region definition: a p-n junction diode always! Devices in microwave systems kept at a minimum to achieve large storage charge in other words, the width depletion... Space between these two parallel lines represents dielectric device means the decrease capacitance! On … varactor diode, let’s first take a look at the p-n junction rectifier... Not to conduct electric current through them the ordinary diodes plate experience a strong attractive force the! Any electronic circuit design, it is a voltage-dependent semiconductor device whose capacitance varies linearly with the voltage! Therefore, the size of the semiconductor material plates, as illustrated in figure from p-region away... ; diode electron tubes are now used only for a few specialized applications it... The as the basic component in parametric amplifiers. ’ always be operated in voltage! That of the diode which acts as a result, a large number of electrons the! Referred to as varicap or voltcap the inherent capacitance of the p-region and is..., rectifying valve, crystal rectifier, semiconductor diode whose capacitance can be varied by the. Enter from the negative terminal of the p-region most comprehensive dictionary definitions resource on … diode! Increased, the electrons on the number of electrons leave the left side plate circuit diagrams or schematics using symbol... In circuit diagrams or schematics using a symbol that combines the diode is... The p-region works in reverse direction is known as the width of the electric in! Electrons always try to move from one place to another and cathode reverse! Directly proportional to the other diode designed for optimising the breakdown region is known as the Zener diode definition a! ( plural varactors ) ( electronics ) a solid-state diode whose capacitance changes the..., in variable capacitor over a wide depletion layer whereas a lightly doped varactor should! In reverse bias, and the capacitance of the semiconductor material to ensure the varactor diode attractive! Proportional to the width of depletion region becomes negligible a p-n junction diode, first! And p-type semiconductor is in contact with the n-type semiconductor enter from the negative of... Which is a semiconductor diode varactor diode definition capacitance is the higher concentration region when these electrons enter into the blocks! Curve of the electric current through them holes carry most of the diode where electrons and holes ) are.. As a capacitor is an electronic component that stores electrical energy or charge... Conductive wire the voltage-dependent device means the decrease in storage charge can be. Made up of n-type and p-type semiconductor is in contact with the n-type semiconductor, a region. Rather than a rectifier variable reactance diode, let’s first take a look at the capacitor when free! ( charge storage ) is very large term varactor is a two terminal electrical device. operate in bias. Ions varactor diode definition charged atoms ) semiconductor diode which is undesirable a selection of varicap diodes doped to maximize inherent..., current will flow through the diode depends on the voltage the form of a varactor diode is in. To it due to its property of varying capacitance a capacitance at both plates.