The varactor diode always works in reverse bias and it is voltage dependent semiconductor device. As a result hyperabrupt diodes are generally only used at lower microwave frequencies up to a few GHz at most. 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 capacitor in a circuit can be replaced with the varactor diode, but it is essential to ensure the tune voltage, i.e. 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. It is very low cost, thus it can be used in various electronic and electrical applications. Reliability. It is reliable you can use it to vary capacitance. Working, Construction Applications (2019). Low cost. Advantages of Varactor Diode The following are the advantages of the varactor diode. 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. Since in the depletion region there are no charge carriers, hence the zone acts as an. Some disadvantages are reverse-biased operated so no current flows. 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. A varactor is used in Radio Receivers for tuning the circuit. By applying a reverse voltage across varactor diode, the width Wd of the depletion layer increases. A hexagonal cell  method is on... Zigbee network technology is a wireless protocol used for wireless networking and connectivity. The varactor diode is manufactured in such as way that it shows better transition capacitance property than the ordinary diodes. d. lesser sensitivity to harmonics . Thus RW and R1 form a voltage divider which is used to measure the amount of reverse bias voltage across the varactor diode D1 and therefore its capacitance. The cell with low traffic speed is called as micro-cells and large high-speed traffic called macro-cells. It has very low power loss because varactor diode produces very low noise. When the reverse bias voltage increases, the junction capacitance decreases, on the contrary, the junction capacitance increases. used to achieve reconfiguration such as PIN diodes, varactor diodes, Micro Electro Mechanical Switches (MEMS) etc. tunnel Diode by King of physics . Because they have a tendency to merge with each other; the hole has a tendency to merge with the electron and vanish. It starts conducting only when a junction potential is about 0.5V to 0.7 volts is applied, Until that time, current is negligible. The varactor diode is made up of the p-type and n-type semiconductor. We have learned that we can decrease or increase the junction capacitance of varactor- diode by changing the reverse bias voltages on the diode. The resistance RW in the circuit is the resistance of inductor’s winding. Note that the inductor is parallel with the capacitance of varactor diode. In fact, this condition is shown in the picture above. It generates less noise as compared to 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. ", 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 inductor and the varactor diode form a parallel LC circuit. It is portable due to the small size and also a lightweight. Portability: It is portable due to the small size and lightweight. View Answer: Answer: Option B. Hence they can be used in televisions in the resonant LC tank circuit. Schottky diode has very low power consumption. 5.4. Varactor Diode is a reverse biased p-n junction diode, whose capacitance can be varied electrically. Solution: 12. Voltage control oscillators are widely used in receiving and transmitting circuits in the field of. Zener Diode Characteristics, Working and Practical Applications. But rectification is not all that a diode can do. 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. the voltage required to set the varactor diode capacitance. The advantages of the hyperabrupt varactor come at a cost as there is a substantial reduction in Q when compared to abrupt varactor diode. A P-N junction diode which acts as a variable capacitor by changing reverse bias is known as a Varactor Diode. Word Varactor is given to it due to its property of varying capacitance. The varactor diode produces less noise as less compared to the other diode. Reliability: It is more reliable than other P-N junction diodes. d. RIMPATT. 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. Cell splitting is a method of subdividing cell into the smaller sized cell. Thus, by decreasing reverse bias will decrease the resonant frequency and vice-versa. A varactor diode is a simple variable capacitor that allows oscillator circuits and other circuits to be easily tuned by applying a voltage. 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. It generates very less noise as compared to others P-N junction diodes. 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. Varactor diode is also sometimes referred to as varicap diode, tuning diode, variable reactance diode, or variable capacitance diode. These also finds its application in Bandpass filters, amplifiers and frequency multipliers. Diode Clipper Circuits Working and their Applications. For normal operation, a varactor diode is always operated in reverse bias as we studied. varactor diode has Low Noise. The performance of the cellular system is highly affected by interference. 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. To ensure the tune voltage, i.e 3 % and a relatively narrow tuning range of around %... 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