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Understanding NPN Transistor: Collector and Base Currents, Slides of Electronics

Anna UniversityElectronics

The concept of collector and base currents in an npn transistor. It discusses the equation for collector current, the role of diffusion current, and the impact of base current. The document also touches upon the influence of fabrication parameters on base current.

Typology: Slides

2011/2012

Uploaded on 08/07/2012

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saravati 🇮🇳

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Partial preview of the text

Download Understanding NPN Transistor: Collector and Base Currents and more Slides Electronics in PDF only on Docsity!

NPN Transistor : Collector Current

BE^ T

po

p

F T ep fp

v V

n

n

V V

n

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or

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Recall

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or

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NPN Transistor: Collector Current

=^

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p N E C

)O

say that can we

Therefore

,

get we

equation

above in the

plug we If^

)O(

VBE^ V^ T po N E C

p

e

W

n qD A i

n =

CB n

C

v

I

i

Note

positive

by

accross

swept

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collector

over to

cross

electrons

most

be since

will

that

NPN Transistor: Collector Current

get

we

that

can write

Finally we

So

VBE^ V^ T S C^

eI

i^

=  ^  

W

N

n

qD

A

I

or

N

n

n

o

n

on W

qD

A

I

A

i N E S

A i ep

p

p N E S

2

2 ,

and

Where

=^

W

N

n

qD

A

I

eI

i

A

i N E S

V V S C^

BE^ T

2

and

NPN Transistor: Base Current

exp be will

so

exp

process ion

recombinatto due lost holes replace

circuit to

external by

supplied holes some

exp

emmitterto base from

injected holes due

parts two of

composedis

current base The

2 1 1 2

BE^ T

B B B

BE T

B

BE T

B

V^ V

i i i

V V

i

V V

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NPN Transistor: Emitter Current

α

β β α

β β

β

C E C E C C E

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i i i

=

≡

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=

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α^ α β

α −

that

show

can

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and

say that

can

we

Thus

VBE^ VT S E^

e

I

i

NPN Transistor Models

Exercise Solved on the board

Exercise Solved on the board

NPN Transistor Curves

NPN Transistor in SAT Mode