Advantages of Varactor diode; Important applications of Variable diode; What is Varactor Diode? These diodes have a p-n-n+ structure, where the applied voltage modulates the width of the depletion region between the p and n+ sides. The Schottky diode exhibits two major advantages over traditional diodes. These are special purpose diodes, also called a varicap diodes or tuning diodes or variable capacitance diodes, designed to work always in reverse bias state. Advantages of Varactor Diode: The following are the few advantages of the varactor diode. The TRAPATT or TRApped, Plasma Avalanche Triggered Transit diode belongs to the same basic family as the IMPATT diode but it provides a number of advantages in some applications. The following are the few advantages of the varactor diode. When the junction is forward biased, the barrier potential for these carriers decreases; so there is the notable amount of free carriers moving from this (electrons and holes), due to that moment it constitutes a current; hence large current can flow. Advantages of Varactor Diode. a. lower noise. b. higher efficiency. Since they are free carriers, when they are brought together, a junction is formed. What is Varactor Diode | Construction, Working, Characteristics, And Applications, Download any E-Book for Free from Z-Library, varactor diode advantages and disadvantages, voltage controlling tuning circuit using Varactor diode, BARITT Diode? When this happens, the region at the junction becomes free of carriers. 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… In general, electronic circuits can be built with a various electrical and electronic components like resistors, capacitors, diodes, transistors, integrated circuits, transformers, Thyristors, etc. Voltage control oscillators are widely used in receiving and transmitting circuits in the field of. When run with a AC small signal that have a high DC offset, it functions ver… Read More: Download any E-Book for Free from Z-Library. Note that the inductor is parallel with the capacitance of varactor diode. As the reverse potential increases the width of the depletion region increases, which in turn reduces the capacitance. These also finds its application in Bandpass filters, amplifiers and frequency multipliers. Portability: It is portable due to the small size and lightweight. used to achieve reconfiguration such as PIN diodes, varactor diodes, Micro Electro Mechanical Switches (MEMS) etc. Varactor diodes are widely used in TV sets and radios operating at high frequencies. The varactor diode is manufactured in such as way that it shows better transition capacitance property than the ordinary diodes. They are also used in frequency control circuits. d. RIMPATT. Now, since the depletion region has depleted all the carriers, we can consider this region as equivalent to two parallel plates of a capacitor within which we have sandwiched an insulator (Di-electric), No carriers exist there; so, it is an insulator. It is one type of twisted pair cable. It starts conducting only when a junction potential is about 0.5V to 0.7 volts is applied, Until that time, current is negligible. SlideShare Explore ... variation. Some advantages of varactor diode is function of the voltage that impressed on its terminals. ©2017-2020 ecstuff4u.com The content is copyrighted and may not be reproduced. This is all about Varactor Diode Working, Construction, and Practical Applications, and if you like our post give a thumbs up and comment below to appreciate the work and stay connected with us. They range from diodes with opti… When a forward bias voltage is applied, the electric current flows, as a result, the depletion region becomes negligible, which is undesirable. The advantage of Schottky diode some of below It has a very low cut-in voltage of about 0.3 V. Schottky diode has very low switching time. As it exhibits voltage-controlled capacitance characteristic thus they have taken the place of mechanically tuned capacitors. Hence they are not useful when operating them in the forward bias mode, Advantages and disadvantages of PIN diode, Advantages and disadvantages of LASER diode, "Fall in Love with ENGINEERING and TECHNOLOGY by Easiest Way of Learning. Applications of Varactor Diode: variable diodes are used in a variable resistant tank, which is generally an L-C circuit. This, in turn, changes the resonant frequency of the Inductor Capacitor LC circuit. 5.4. Following are the benefits or advantages of Diode: ➨It functions as rectifier in order to convert alternating current into direct current. When the junction is reversed biased; the potential barrier is increasing; the reverse bias will help this potential barrier to get increased. Thus, the power loss due to noise is low in varactor diodes. This reduces the overall capacitance and the capacitance range by half, but has the advantage of reducing the AC component of voltage across each device and has symmetrical distortion should the AC component possess enough amplitude to bias the varicaps into forward conduction. It generates less noise as compared to other PN junction diode, It is portable due to the small size and  also a lightweight, It is reliable you can use it to vary a capacitance, These diodes are specially designed to work in the reverse-biased mode. The diode whose internal capacitance varies with the variation of reverse voltage such type of diode is known as the varactor diode. Advantages of using a Varactor Diode: Since the varactor diode has low noise compared to the p-n junction diode, there is less power loss in this diode. The oscillator can be enabled by tuning the diode D1. Hey Bostjan, Thanks for your comment, and this circuit just explains the basic concept behind voltage control tunning through tunnel diode, whereas the voltage divider is formed between R1 and Rw1 and also by varying inductor values we can change the resonant frequency of the Inductor Capacitor LC circuit. Hence they can be used in televisions in the resonant LC tank circuit. Given Fig: below shows the use of varactor diode in a tuned circuit. A varactor is always operated in reverse bias and it produces capacitance effect, this is because its anode and cathode terminals act as the plate of the capacitor and the free space between them acts as a. Given fig: below shows the curve between reverse bias voltage VR across varactor diode and total junction capacitance CT. The hyperabrupt diodes … Solution: 12. ", Advantages and disadvantages of Zener diode, Advantages and disadvantages of tunnel diode, Advantages and disadvantages of Schottky diode, Advantages and disadvantages of an avalanche photodiode, Advantages and disadvantages of a photodiode, Advantages and disadvantages of full wave rectifier, Advantages and disadvantages of floppy disk, Umbrella cell approach in mobile communication, Advantages and disadvantages of Zigbee networks, Advantages and disadvantages of pulse width modulation, Difference between cell splitting and cell sectoring, Advantages and disadvantages of shielded twisted pair cable, Advantages and disadvantages of conduit wiring system, Difference between co-channel interference and adjacent channel interference. The resonant frequency Fr of the Inductor Capacitor LC circuit is given by: If the amount of reverse bias on varactor diode is increased, the value of Capacitance (C) of the varactor increases. The following are the few Disadvantages of the varactor diodes. These diodes have a similar structure as a p-n diode; the structure of a varactor diode is rather simple and illustrates its power as a component with nonlinear reactance. The P-type material with holes (considered as positive) as majority carriers and N-type material with electrons (considered as negative charge) as majority carriers act as charged plates in the PN junctions. Relation Between Voltage and Capacitance. Consequently, the total capacitance of the junction is increased. The capacitor in a circuit can be replaced with the varactor diode, but it is essential to ensure the tune voltage, i.e. Varactor diodes finds large number of applications within the RF design arena and it is difficult to discuss about all the applications of varactor diodes or varicap diodes. Varactor diodes are also referred to as varicaps or tuning diodes. Reliability. ➨It is used to suppress voltage spikes. Interference is the main problem in increasing capacity. King of physics constant pagl 11,570 views For normal operation, a varactor diode is always operated in reverse bias as we studied. The increase in Capacitance will cause the resonant frequency Fr of the circuit to decrease. It generates less noise as compared to other P-N junction diode. Advantages of Varactor Diode The following are the advantages of the varactor diode. Topic: Varactor Diode Name: Abdul Mohiz Roll No: CS-15-41 2. o A varactor is a diode that always works /operates in reverse bias and is doped to maximize the inherent capacitance of depletion region. Varactor diode is also sometimes referred to as varicap diode, tuning diode, variable reactance diode, or variable capacitance diode. Powered by. [su_note note_color=”#f9fcd2″]These type of diodes are specially designed to work in the reverse biased mode, Hence they are not useful when operating them in forward bias mode.[/su_note]. Zener diode consists of a highly doped reversed biased, p-n junction diode while operating in the breakdown region. Instead of the 0.6 to 0.7 volts seen with a silicon junction diode, a Schottky diode may turn on with as little as 0.2 or 0.3 volts. The resistance RW in the circuit is the resistance of inductor’s winding. 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. A Diode is an electronic component that has two terminals and allows current to flow only in one direction. The Varactor diodes belong to the family of semiconductor devices. That means, more area in this gets depleted of carriers and this region widens. Thereby, it creates a potential barrier; this is called the junction potential, and this potential barrier of a junction, happens to be around 0.5V to point 0.7 volts. Lets look into the construction, working of diode, characteristics and applications of varactor diode . As a result these diodes are also referred to as varicaps, tuning diodes, voltage variable capacitor diodes, parametric diodes and variable capacitor diodes. The TRAPATT diode is normally used as a microwave oscillator. Word Varactor is given to it due to its property of varying capacitance. Floppy disk is a magnetic storage medium for a computer system. Moreover it is used to protect electronic components which are vulnerable to reverse voltages. Tunnel Diode in hindi tunnel Diode by constant pagal . Cell splitting is a method of subdividing cell into the smaller sized cell. Advantages of varactor diode: It generates less noise as compared to other PN junction diode. This makes a varactor diode ideal for being used in circuits that require voltage-controlled tuning. So, every P-N junction has a depletion region in between, and this depletion region width is dependent upon the voltage. d. lesser sensitivity to harmonics . The price to be paid for these advantages are a relatively narrow tuning range of around 3% and a relatively low Q. Advantages of varactor diode. Each switch has its own advantages and disadvantages. Also RF signal is present on the potentiometer, which is a disadvantage. It is very low cost, thus it can be used in various electronic and electrical applications. Since in the depletion region there are no charge carriers, hence the zone acts as an. Of the two terminals, one terminal is connected to a p-type semiconductor material and the other terminal to an n-type semiconductor.Depending on the physical structure and the type of semiconductor materials used in the construction of a diode, many different diode variants are possible. Varactor Diodes, also known as "variable reactance diodes", are made using the characteristic that the junction capacitance varies with the applied voltage when the PN junction is reverse biased. The cell with low traffic speed is called as micro-cells and large high-speed traffic called macro-cells. It is similar to  UT... A modem is a basic type of network device that both modulates and also has demodulated for analog carrier signals called as a sine wave fo... Conduit wiring is a system where the cable is enclosed in metal or some plastic tubes. Here this article gives the advantages and disadvantages of the Zener diode to better understand this topic. Required fields are marked *, List of Top Best Schools in Pakistan 2020 (Updated), Powered by WordPress & Theme by StudentsHeart.com, Zener Diode , V-I Characteristics, Working, and Applications. Working, Construction Applications (2019). The advantages of the hyperabrupt varactor come at a cost as there is a substantial reduction in Q when compared to abrupt varactor diode. Therefore, the capacitance of the junction decreases. Some disadvantages are reverse-biased operated so no current flows. On the other hand, if we reduce the reverse voltage across the varactor diode, the width Wd of the depletion layer decreases. This circuit cannot work in practice. The inductor has very low ohmic resistance and therefore cannot be practically used in a voltage divider. The advantages of varactor tuning are low power consumption, small size, and high tuning speed. the voltage required to set the varactor diode capacitance. Zener Diode Characteristics, Working and Practical Applications. First, they have very fast switching times, perhaps orders of magnitude of improvement. Table 15.2 gives a comparison of the current state of … The inductor and the varactor diode form a parallel LC circuit. ECSTUFF4U | ONLINE ELECTRONICS, ELECTRICAL ENGINEERING KNOWLEDGE | RESEARCH | INFORMATION |, Full forms related to Wireless communication, Full forms related to Satellite communication, Full forms related to Computer networking, Full forms related to Antenna and Wave Propagation, Full forms related to Optical communication, Full form related to Microprocessor X86 programming, Full form related to Digital signal processing. Your email address will not be published. It is used in storing the charge. It is reliable you can use it to vary a capacitance. varactor diode has Portability and we can say that. 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. Your email address will not be published. The advantages of the hyperabrupt varactor come at a cost as there is a substantial reduction in Q when compared to abrupt varactor diode. 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