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

Give the applications of carbon, Give the applications of carbon. Car...

Give the applications of carbon. Carbon : These materials used in the field of electrical engineering are manufactured from graphite and the other forms carbon as coal and so

What is the signal classification of 8085, What is the signal classificatio...

What is the signal classification of 8085 All the signals of 8085 can be classified into 6 groups Address bus Data bus Control and status signals Power supply and f

Explain limit signal spectrum to prevent aliasing, Explain Limit Signal Spe...

Explain Limit Signal Spectrum to Prevent Aliasing? The sampling frequency should at least be two times that of the highest frequency in the incoming signal to avoid aliasing. T

Give a general account of common drain amplifier, Q. Give a general account...

Q. Give a general account of common drain amplifier? The output is taken over the source terminal and when the dc supply is replaced by its short circuit equivalent, the drain

Explain the term- electronic mail, Explain the term- Electronic Mail (email...

Explain the term- Electronic Mail (email) Another form of communication is through email. This has the below advantages over video conferencing: -  There are no language pro

Compute l per unit length for plate, Q. The inductance per unit length in H...

Q. The inductance per unit length in H/mfor parallel plate in?nitely long conductors in air is given by L = µ 0 d/w = 4π×10 -7 d/w, where d and w are inmeters.Compute L (per unit

Find the total input power, Q. A 230-Vdc shuntmotor delivers 30 hp at the s...

Q. A 230-Vdc shuntmotor delivers 30 hp at the shaft at 1120 r/min. If the motor has an efficiency of 87% at this load, find: (a) The total input power. (b) The line current.

Elementary induction machines, Elementary Induction Machines In the dis...

Elementary Induction Machines In the discussion that followed Equation, the third possiblemethod of producing constant torque was to cause the mmf axes of stator and rotor to r

Net force on the wire due to the interaction of the b-field, Q. (a) Show by...

Q. (a) Show by applying Ampere's circuital law that themagnetic field associated with a long straight, current-carrying wire is given by B φ = µ 0 I/(2πr), where the subscript φ d

Draw and explain diode clipping circuit, Q. Draw and explain diode clipping...

Q. Draw and explain diode clipping circuit ? A diode clipping circuit can be used to limit the voltage swing of a signal. Clipper circuits are used to clip a portion of the w

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