Forward and reverse battery bias, Electrical Engineering

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.

Posted Date: 1/11/2013 12:20:55 AM | Location : United States







Related Discussions:- Forward and reverse battery bias, Assignment Help, Ask Question on Forward and reverse battery bias, Get Answer, Expert's Help, Forward and reverse battery bias Discussions

Write discussion on Forward and reverse battery bias
Your posts are moderated
Related Questions
Q. Draw the circuit of a common drain FET amplifier and explain. FET amplifier circuit The weak signal is applied between gate and source and amplified output is obtained

Q. A 15-kVA, 2200:220-V, two-winding, single- phase transformer is connected as an autotrans- former to step up voltage from 220 V to 2420 V. Without exceeding the rated current of

Q. Which of the 3 transistor configuration is best to use in cascade if maximum voltage gain is to be realized?  The common collector configuration is not used for intermediate

explain how can you find hysteresis loss from hysteresis loop

Q. Give the classification of Oscillators?  Depending on the type of the output waveform, oscillators are classified as sinusoidal (or harmonic) oscillators and relaxation osci

can I get matlab code for out of band radiation reduction ofdm system

An abrupt silicon (n i = 10 10 cm -3 ) p-n junction consists of a p-type region containing 10 16 cm -3 acceptors and an n-type region containing 5 x 10 16 cm -3 donors. a)

Low and high resistivity materials and their applications

An electromechanical voltmeter with internal resistance of 1 k and an electronic voltmeter with internal resistance of 10 M are used separately to measure the potential differenc

Q. Illustrate Signal attenuation? Signal attenuation in many channels can be offset by using amplifiers to boost the signal level during transmission. However, the amplifier al