Npn bjt with forward-biased, Electrical Engineering

Assignment Help:

NPN BJT with forward-biased:

An NPN transistor can be referred as two diodes along with a shared anode. In common operation, the base-emitter junction is forward biased and the base-collector junction is reverse biased. In an NPN transistor, for instance, while a positive voltage is applied to the base-emitter junction, the equilibrium among the thermally generated carriers and the repelling electric field of the depletion region turns unbalanced, permitting thermally excited electrons to inject into the base region. These electrons wander or "diffuse" via the base from the region of high concentration near the emitter in the direction of the region of low concentration near the collector. The electrons in the base are termed as minority carriers since the base is doped p-type that would make holes the majority carrier in the base.

To minimize the percentage (%) of carriers which recombine before arriving at the collector-base junction, the base region of transistor must be thin enough which carriers can diffuse across it in much less time than as compared to the semiconductor's minority carrier lifetime. Particularly, the thickness of the base has to be much less than diffusion length of the electrons. The collector-base junction is reverse-biased, and thus the little electron injection takes place from the collector to the base, but electrons that diffuse by the base towards the collector are swept into the collector via the electric field in the depletion region of the collector-base junction. The thin shared base and asymmetric collector-emitter doping is what distinguishes a bipolar transistor from two separate and oppositely biased diodes that are connected in series.


Related Discussions:- Npn bjt with forward-biased

Decision making, Decision  Making The rhombus diamond symbol  is used...

Decision  Making The rhombus diamond symbol  is used to represent  the decision making  process  as shown  below.                                          Figure  De

Basic operations of 8085 microprocessor , Basic Operations of 8085 Micropro...

Basic Operations of 8085 Microprocessor The 8085 microprocessor  performs followings  five  basic  operations . 1. Opcode Fetch :  Reading and decoding  operation code  of

Explain acceptance cone, Explain Acceptance cone? The fibre air - core ...

Explain Acceptance cone? The fibre air - core interface is display below: In this figure Omax is the maximum angle, inside that the rays undergo total internal reflecti

Transformers., Calculations of sending line voltage

Calculations of sending line voltage

Determine the current for given capacitance values, Q. Consider the circuit...

Q. Consider the circuit of Figure. Determine and sketch i L (t) and v C (t) for capacitance values of (a) 1/6 F, (b) 1/8 F, and (c) 1 / 26 F. Note that the capacitance values ar

Define the x-nor or exclusive-nor gate, Define the X-NOR or Exclusive-NOR G...

Define the X-NOR or Exclusive-NOR Gate?   This is the EX-OR gate with the output inverted, as shown by the 'o' on the output and the output Q is true if inputs A and B a

Define voltage divider rule, Define voltage divider rule Voltage drop a...

Define voltage divider rule Voltage drop at every resistor that connected by serial can be search by using voltage divider rules (VDR).

Commercial fm radio broadcasting, Q. Commercial FM radio broadcasting? ...

Q. Commercial FM radio broadcasting? Commercial FM radio broadcasting utilizes the frequency band of 88 to 108 MHz for the transmission ofmusic and voice signals. The carrier

Ujt as relaxation oscillator, UJT as relaxation oscillator: The UJT re...

UJT as relaxation oscillator: The UJT relaxation oscillator is shown in fig. it consist of a UJT and a capacitor C which is charged through a variable resistance R when VBB is

Calculate the diameter of the core, A step index multi mode fibre along wit...

A step index multi mode fibre along with numerical aperture of 0.2 supports approximately 1000 modes at an 850µm wavelength. Calculate a) What is the diameter of the core? b)

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