Forward and reverse battery bias, Electrical Engineering

Assignment Help:

Forward and Reverse battery bias

In diagram below(a) the battery is arranged that is why the negative terminal supplies electrons to the N-type material. These types of electrons diffuse toward the junction. The positive terminal eliminates electrons from the P-type semiconductor, forming holes that diffuse toward the junction. If the battery voltage is sufficiently great to overcome the junction potential (0.6V in Si), the N-type electrons and P-holes merge annihilating each other. This frees up space in the lattice for more carriers to flow toward the junction. So, currents of P-type and N-type majority carriers flow in the direction of the junction. The recombination at the junction permits a battery current to flow via the PN junction diode. Such type of a junction is said to be forward biased.

1057_Forward and Reverse battery bias.png

Figure: (a) Forward battery bias repells carriers toward junction, where recombination results in battery current. (b) Reverse battery bias attracts carriers toward battery terminals, away from junction. Depletion region thickness increases. No sustained battery current flows.

If the battery polarity is inverted like in Figure above (b) majority carriers are attracted away from the junction in the direction of the battery terminals. The positive battery terminal attracts N-type majority carriers, electrons, away from the junction. The negative terminal attracts P-type majority carriers, holes, away from the junction. This raises the thickness of the non conducting depletion region. There is no recombination of majority carriers; so, no conduction. This arrangement of battery polarity is known as the reverse bias.


Related Discussions:- Forward and reverse battery bias

Where does the real mode on the cpu come from, The original 8086, which onl...

The original 8086, which only had 1 MB of memory. This megabyte is dividing into low memory for IRQ tables, application memory and high memory.

Industrial approach of speed control dc series motor, industrial approach o...

industrial approach of speed control of dc series motor

V-i characteristics - power semiconductor devices , V-I Characteristics ...

V-I Characteristics  In the  normal  mode of  operation of an IGBT  a positive  voltage is applied to the collector relative to emitter. When  the gate is at zero potential wi

Dc generator, A 20kw 220v shunt generator has armature resistance of 0.07 a...

A 20kw 220v shunt generator has armature resistance of 0.07 and a shunt field resisitance 900 ohm find field loss?

Principle of oscillation in an rc phase shift oscillator, Q. What is the ba...

Q. What is the basic principle of oscillation in an RC phase shift oscillator. With a neat sketch explain its working? For producing oscillations there must have positive feedb

Tri state devices, Tri State Devices Tri  State  devices have three  st...

Tri State Devices Tri  State  devices have three  states logic 1  logic  0 and high  impedance. A tri state device ( Buffer/ Inverter) has three  lines output  enable as shown

Input offset current of operational amplifier, Q. Input offset current of o...

Q. Input offset current of operational amplifier? The adverse effect of the input bias current mentioned would be nulli?ed if both inputs were connected to equal resistances (o

Fixed voltage regulators, Q. Fixed Voltage Regulators ? Positive voltag...

Q. Fixed Voltage Regulators ? Positive voltage regulator series with seven voltage options - IC 7800 Series  The 7800 series consists of three - terminal positive volta

CST162_hw5, Draw the state diagram for the state machine described by Table...

Draw the state diagram for the state machine described by Table 7.5 in the text. Note, the table shows the transition to the next state S* from the current state S for the next set

Evaluate the transfer function of the nested-loop system, Q. Determine the ...

Q. Determine the transfer function C(s)/R(s) of the nested-loop feedback system shown in Figure.

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