"PIN diode consist of" Multiple Choice Questions (MCQ) on pin diode with choices 2 operating regions, 3 operating regions, 4 operating regions, and 5 operating regions for engineering graduate colleges. When reverse-biased, the pin diode acts like a nearly constant capacitance. In operation, the cathode is heated to red heat (800–1000 °C, 1500-1800°F). Characteristics of the PIN Diode A PIN diode is a silicon semicon-ductor consisting of a layer of intrinsic (high resistivity) material of finite area and thickness which is contained between highly doped p and n type material. Silicon and germanium semiconductor diodes ... diodes plays a major role in many electronic devices. Learn photodiode, current regulator diodes, zener diode: basic operation and applications, laser diode test prep for university entrance exam. When forward-biased, it acts like a current-controlled variable resistance. The low forward resistance of the intrinsic region decreases with increasing current. The measured capacitance as well as 1/C 2 is plotted as a function of the applied voltage. This is the property of a PIN diode that enables the device to be used as the RF power control element in linear attenuators and modulators. It is used in fast-switching applications. The diode consists of a highly doped p-type region on a lightly doped n-type region on top of a highly doped n-type substrate. The voltage source in forward bias configuration applies pressure on free electrons in N-region and holes in P-region toward the depletion region. This charge consists of When the diode is forward biased, charge is injected into the intrinsic or “I” region. When reverse-biased, the pin diode acts like a nearly constant capacitance. This is shown in Figure (b) and (c). flow of RF current through the diode. The PIN Diode 27. The pin diode has a p region, an n region, and an intrinsic (i) region and displays a variable resistance characteristic when forward-biased and a constant capacitance when reverse-biased. Diode Model with Reverse Recovery 3 Current Flag Current flag of the diode. Photons absorbed in this region create electron-hole pairs that are then separated by an electric field, thus generating an electric current in a load circuit. As an example, we consider the measured capacitance-voltage data obtained on a 6H-SiC p-n diode. A thermionic diode is a thermionic-valve device consisting of a sealed, evacuated glass or metal envelope containing two electrodes: a cathode and a plate.The cathode is either indirectly heated or directly heated.If indirect heating is employed, a heater is included in the envelope. The free electrons and hole recombine with the ions near the depletion region and the depletion region width is reduced. The pin diode consists of heavily doped p and n regions separated by an intrinsic (i) region, as shown in Figure (a). In forward bias operation, the diode act like a closed switch. PIN photodiodes are diodes with a large intrinsic region sandwiched between P-doped and N-doped semiconducting regions. The Schottky diode has a metal-to-semiconductor junction. The tunnel diode is used in oscillator circuits. 2. ... from the positive terminal cannot move towards the negative terminal because the wide depletion region at the p-n junction opposes the flow of holes. Understanding Diode Specifications, Ratings & Parameters Diodes may appear straightforward but they have many data-sheet specifications, parameters and ratings which need to be understood when selecting one as a replacement, or for a new electronic circuit design. P-n junction diode consists of two terminals: positive and negative. 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