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A Transistor May Be Operated in Three Different Configurations

The document discusses three common transistor configurations: common base (CB), common emitter (CE), and common collector (CC). It provides a table comparing the configurations in terms of input/output phase relationship, voltage gain, current gain, power gain, input resistance, and output resistance. Diagrams are also included to illustrate how the transistor is connected in each configuration. The common emitter configuration is highlighted as the most commonly used for amplifiers. Details are then given about using the common emitter configuration with an NPN transistor as an amplifier.

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Apurva Nagdeote
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208 views7 pages

A Transistor May Be Operated in Three Different Configurations

The document discusses three common transistor configurations: common base (CB), common emitter (CE), and common collector (CC). It provides a table comparing the configurations in terms of input/output phase relationship, voltage gain, current gain, power gain, input resistance, and output resistance. Diagrams are also included to illustrate how the transistor is connected in each configuration. The common emitter configuration is highlighted as the most commonly used for amplifiers. Details are then given about using the common emitter configuration with an NPN transistor as an amplifier.

Uploaded by

Apurva Nagdeote
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Different Transistor configurations –

A Transistor may be operated in three different


configurations :

Common Base (CB)

Common Emitter (CE)

Common Collector (CC)


AMPLIFIER COMMON COMMON COMMON
TYPE BASE EMITTER COLLECTOR
INPUT/OUTPUT
PHASE 0° 180° 0°
RELATIONSHIP
VOLTAGE GAIN HIGH MEDIUM LOW
CURRENT GAIN LOW MEDIUM HIGH
POWER GAIN LOW HIGH MEDIUM
INPUT
LOW MEDIUM HIGH
RESISTANCE
OUTPUT
HIGH MEDIUM LOW
RESISTANCE
Common Base (CB) Transistor Configuration

PNP NPN

IE IC IE IC
P N P N P N C
E C E

IB B IB B
+ - + - - + - +
VEE VCC VEE VCC

IE IC IE IC
E C E C

IB IB
B B
Common Emitter (CE) Transistor Configuration
IC IC
PNP C
NPN C

IB P IB N
- +
B N B P
- VCC + VCC
VBB + VBB -
P N
+ -
E E
IE IE

IC
IC
C C
IB IB
B
B
IE IE

E E
Common Collector (CC) Transistor Configuration

PNP IE IE
NPN
E E
IB P IB N
N + -
B B P VEE
- VEE +
VBB - +
P VBB N
+ -
IC C IC C

IE IE
E E
IB IB
B B

IC IC

C
C
IC
C
IB
The Common Emitter (CE) configuration
B
is the most common configuration for IE
using a transistor.
E
We will discuss this in more detail in our
subsequent slides concentrating mainly
NPN
on the way in which this can be used as
an amplifier.
IC
To keep things simple, we will mainly
C
look at circuits using an NPN transistor IB
but the usage of a PNP transistor will be B
very similar (just use voltage supplies of
opposite polarity!). IE

PNP
Common Emitter Configuration (NPN Transistor)

Transistor in Active Mode


IC
C
I C  βI B  β  1I CO
IB

B
IE
IC  βIB ignoring ICO

E
IC  ic  β(IB  ib )
IC  ic  βIB  βib
DC AC DC AC

AC Amplifier ic  βib AC current gain

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