Member • Feb 5, 2012
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SHRIKANT CRAZYHello all, I am Shrikant - a crazy electrinics engineer from Jalandhar. I want to know details about transition capacitance. can anyone please help me? Any kind of help is appreciated.
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Member • Feb 6, 2012
TRANSITION CAPACITANCE
A reverse biased PN-junction has a region of high resistivity sandwiched in between two regions of relatively low resistivity. The P-N regions act as the plates of a capacitor and the depletion layer acts as the dielectricAre you sure? This action cannot be undone. -
Member • Feb 6, 2012
well...thanks for giving the answer but clarify me this why the reverse biased PN JUNCTION has a region of high resistivity?Are you sure? This action cannot be undone. -
Member • Feb 6, 2012
Connecting the P type region to the negative terminal of the battery and the N type region to the positive terminal corresponds to reverse bias.
FOR HIGH RESISTIVITY:
Because the p-type material is connected to the negative terminal of the power supply, the <a href="https://en.wikipedia.org/wiki/Electron_hole" target="_blank" rel="nofollow noopener noreferrer">Electron Hole</a> in the P-type material are pulled away from the junction, causing the width of the depletion zone to increase. the N-type region is connected to the positive terminal, the electrons will also be pulled away from the junction. Thus, the <a href="https://en.wikipedia.org/wiki/Depletion_region" target="_blank" rel="nofollow noopener noreferrer">Depletion Region</a> widens, and increases with increasing reverse-bias voltage. This increases the voltage barrier causing a high resistance to the flow of charge carriers, thus allowing minimal electric current to cross the pân junction.Are you sure? This action cannot be undone. -
Member • Feb 6, 2012
aarthivg thank you so muchAre you sure? This action cannot be undone. -
Member • Feb 6, 2012
i think i should also explain mate..... well, when a p-n junction diode as a reverse biased configuration then the negative terminal of battery is connected to the p side of diode and the positive side is connected to the n side. due to which the the electrons are collected to the n side as well as the holes are collected to the p side. due to which the depletion region is increased which works as dielectric having high resistivity and the whole configuration is considered as transition capacitor.Are you sure? This action cannot be undone.