Pn-junction under bias, Electrical Engineering

Assignment Help:

Q. pn-Junction under Bias?

Let an external source be connected between the p- and n-regions, as shown in Figure (a). (b) shows the circuit representation of the pn-junction or diode, and its external circuit. The voltage source V, called the bias, either decreases or increases the potential barrier, thereby controlling the flow of carriers across the junction. With V = 0, the barrier is unaffected and the pn-junction has zero current. Positive values of V, known as forward biasing, decrease the potential barrier, thereby increasing the number of electrons and holes diffusing across the junction. The increased diffusion results in a net current, called the forward current, from the p-tothe n-region. With increased V, the forward current further increases rapidly because the barrier is reduced even further.Making V negative (reverse biasing), on the other hand, increases the potential barrier and reduces the number of carriers diffusing across the boundary. The drift component produced by the electric field from the n-tothe p-region causes a small current, called the reverse current (or saturation current) IS. The magnitude of the saturation current depends on the doping levels in the p- and n-type materials and on the physical size of the junction. Increasing the reverse bias, however, does not affect the reverse current significantly until breakdown occurs.

1316_pn-Junction under Bias.png


Related Discussions:- Pn-junction under bias

EMI, Ask question (c) Reduce each of the given signal transmission situatio...

Ask question (c) Reduce each of the given signal transmission situations to a source, coupling path(s), and receptor: (i) AM radio transmission to the human ear. (ii) TV transmis

Common-emitter configuration, Q. Common-Emitter Configuration? The emit...

Q. Common-Emitter Configuration? The emitter part of a circuit being common to both the input and the output portions, Figure (a) illustrates a common-emitter (CE) BJT amplifie

Components of gis, Components of GIS: 1.  Software: GIS software gi...

Components of GIS: 1.  Software: GIS software gives the functions and tools required to store, analyze, and show geographical information. The key software elements are:

Grade of service in loss systems, Q. Grade of Service In loss systems? ...

Q. Grade of Service In loss systems? Grade of Service : In loss systems, traffic carried by the network is normally lower than actual traffic offered to the network by subscri

Electrical distribution system, 1. Name the three parts of a programmable l...

1. Name the three parts of a programmable logic controller (PLC) and explain why the PLC is preferred by designers over electromechanical relays. 2. Medium-voltage circuit break

Realize the function f by a k map using 0s, Q. Given the following truth ta...

Q. Given the following truth table: (a) Realize the function f by a K map using 0s. (b) Realize the function f by a K map using 1s.

Importance of transistor, Importance: The transistor is the main activ...

Importance: The transistor is the main active component in practically all current electronics, and is considered through many to be one of the greatest inventions of the 20 t

Bronze is an alloy of which metal, Bronze is an alloy of  (A) Copper....

Bronze is an alloy of  (A) Copper.  (B)  Aluminium. (C)  Silver.  (D)  Carbon. Ans: Bronze is an alloy of copper.

Plc, in industry

in industry

Emf produced by windings, Q. emf produced by windings? The time variati...

Q. emf produced by windings? The time variation of emf for a single conductor corresponds to the spatial variation of air-gap flux density. By suitable winding design, the harm

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd