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. A Diode is an electronic component that has two terminals and allows current to flow only in one direction. The Varactor diode is a two terminal device one terminal is Cathode and another Anode. It … Zener diode consists of a highly doped reversed biased, p-n junction diode while operating in the breakdown region. 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. 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. When this happens, the region at the junction becomes free of carriers. First, they have very fast switching times, perhaps orders of magnitude of improvement. Hence they can be used in televisions in the resonant LC tank circuit. Word Varactor is given to it due to its property of varying capacitance. The varactor diode can be tuned by applying tuning voltage or bias through an isolating series resistor R1. Applications of Varactor Diode: variable diodes are used in a variable resistant tank, which is generally an L-C circuit. It has small size and portable you can use it in circuits easily. As a result hyperabrupt diodes are generally only used at lower microwave frequencies up to a few GHz at most. In general, electronic circuits can be built with a various electrical and electronic components like resistors, capacitors, diodes, transistors, integrated circuits, transformers, Thyristors, etc. Note that the inductor is parallel with the capacitance of 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. Thus, the power loss due to noise is low in varactor diodes. Varactor diodes are mostly used as tuned capacitors and they have significantly replaced mechanically tuned capacitors in various electronic applications. Low Noise: It generates less noise as compared to the other P-N junction diode. On the other hand, if we reduce the reverse voltage across the varactor diode, the width Wd of the depletion layer decreases. 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. By adjusting the setting of a potentiometer (R1), we can vary the capacitance of diode easily. It is reliable you can use it to vary a capacitance. variable diodes are lightweight and easily portable due to its small size. [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]. Varactor Diode is a reverse biased p-n junction diode, whose capacitance can be varied electrically. The Schottky diode exhibits two major advantages over traditional diodes. Varactor diode construction. It generates less noise as compared to other P-N junction diode. Since they are free carriers, when they are brought together, a junction is formed. 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. ", 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. For normal operation, a varactor diode is always operated in reverse bias as we studied. 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. Some advantages of varactor diode is function of the voltage that impressed on its terminals. The function of the varactor diode is to store charges, so it is always operated in reverse bias condition. As a result these diodes are also referred to as varicaps, tuning diodes, voltage variable capacitor diodes, parametric diodes and variable capacitor diodes. When run with a AC small signal that have a high DC offset, it functions ver… Varactor diode is also sometimes referred to as varicap diode, tuning diode, variable reactance diode, or variable capacitance diode. 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. Indicate which of the following diodes will produce the highest pulsed power output: a. Varactor. Tunnel Diode in hindi tunnel Diode by constant pagal . 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. The parent cell that was originally congested is called as mac... STP stands for shielded twisted pair cable. Some disadvantages are reverse-biased operated so no current flows. Zener Diode Characteristics, Working and Practical Applications. Advantages of Varactor Diode. Lets look into the construction, working of diode, characteristics and applications of varactor diode . Low cost. Here this article gives the advantages and disadvantages of the Zener diode to better understand this topic. As it exhibits voltage-controlled capacitance characteristic thus they have taken the place of mechanically tuned capacitors. So, we can say its equivalent to a capacitor. It is basically similar to the UTP. King of physics constant pagl 11,570 views It is reliable you can use it to vary capacitance. When the junction is reversed biased; the potential barrier is increasing; the reverse bias will help this potential barrier to get increased. 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. 5.4. So, we can conclude that the depletion layer width is dependent on the applied voltage. 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. In this article, We will cover Varactor Diode also known as varicap diode, we will cover their VI Characteristics, Construction, and their practical applications step by step. It is economical. It is one type of twisted pair cable. 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. Solution: 12. Advantages of varactor diode. The advantages of the hyperabrupt varactor come at a cost as there is a substantial reduction in Q when compared to abrupt varactor diode. ➨It is used to suppress voltage spikes. Each switch has its own advantages and disadvantages. But unlike a zener diode they don’t allow the flow of current in zener breakdown regions. 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. The TRAPATT diode is normally used as a microwave oscillator. This makes a varactor diode ideal for being used in circuits that require voltage-controlled tuning. By applying a reverse voltage across varactor diode, the width Wd of the depletion layer increases. Interference is the main problem in increasing capacity. 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. This, in turn, changes the resonant frequency of the Inductor Capacitor LC circuit. They range from diodes with opti… Some disadvantages are reverse-biased operated so no current flows. Given Fig: below shows the use of varactor diode in a tuned circuit. The Varactor diodes belong to the family of semiconductor devices. ©2017-2020 ecstuff4u.com The content is copyrighted and may not be reproduced. The rectifier diodes are used in power supplies to convert a.c. voltage into d.c. voltage. Diode Clipper Circuits Working and their Applications. 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. 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. Its cathode has an extra capacitor, parallel two lines show the construction of capacitor and space between them shows a dielectric medium. The increase in Capacitance will cause the resonant frequency Fr of the circuit to decrease. The oscillator can be enabled by tuning the diode D1. 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. That means, more area in this gets depleted of carriers and this region widens. Floppy disk is a magnetic storage medium for a computer system. Given fig: below shows the curve between reverse bias voltage VR across varactor diode and total junction capacitance CT. The performance of the cellular system is highly affected by interference. Advantages of Varactor Diode The following are the advantages of the varactor diode. A varactor is used in Radio Receivers for tuning the circuit. The capacitor C1 is used to prevent the reverse bias for the varactor diode, also avoids the diode getting short circuited through the inductor. 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. Your email address will not be published. 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. so this circuit is perfect for the operation of voltage tunning. Powered by. Varactor diodes are specially designed to take advantage of this characteristic and are used as Voltage Controlled capacitors rather than traditional diodes. basica... Engineering is Humanity, Electronics is Religion. Diodes are also used as RF switches and as harmonic generators for efficient frequency multiplication. d. RIMPATT. Let us discuss about the diode which is a two terminal electrical device. Here this article gives information about the advantages and disadvantages of varactor diode to know more detailed about it. The hyperabrupt junction gives a much greater capacitance change for the given voltage change. Therefore, the capacitance of the junction decreases. tunnel Diode by King of physics . It generates very less noise as compared to others P-N junction diodes. Applications of Varactor Diode. It has small size and portable you can use it in circuits easily. The power loss due to noise is low. Second, they exhibit relatively low turn on voltages. Advantages of Varactor Diode: The following are the few advantages of the varactor diode. A varactor diode is a simple variable capacitor that allows oscillator circuits and other circuits to be easily tuned by applying a voltage. Also RF signal is present on the potentiometer, which is a disadvantage. The advantages of varactor tuning are low power consumption, small size, and high tuning speed. So, every P-N junction has a depletion region in between, and this depletion region width is dependent upon the voltage. The hyperabrupt diodes … The inductor has very low ohmic resistance and therefore cannot be practically used in a voltage divider. In fact, this condition is shown in the picture above. 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… 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. Following are the benefits or advantages of Diode: ➨It functions as rectifier in order to convert alternating current into direct current. Moreover it is used to protect electronic components which are vulnerable to reverse voltages. Working, Construction Applications (2019). 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. Table 15.2 gives a comparison of the current state of … Bipolar Junction Transistor- Introduction to (BJTs). This winding resistance of the inductor is in series with the potentiometer (R1). Varactor Diode 7.15 Application of Varactor Diode 7.16 Shockley Diode INTR ODUCTION INTRODUCTION T he most common application of diodes is rectification. Relation Between Voltage and Capacitance. Varactor diodes are also referred to as varicaps or tuning diodes. The diode whose internal capacitance varies with the variation of reverse voltage such type of diode is known as the varactor diode. c. ability to operator at higher frequencies. The varactor diode is manufactured in such as way that it shows better transition capacitance property than the ordinary diodes. Your email address will not be published. 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