Transistor configurations, Other Engineering

TRANSISTOR CONFIGURATIONS:

Before a transistor can be used, it must be connected into an input circuit (by two wires) and an output circuit (two wires).  However, because the transistor has only three terminals, one of the terminals must be in both the input and output circuits; this is then called "The Common terminal".  Three circuit configurations are possible and are illustrated in figure.

759_TRANSISTOR CONFIGURATIONS.png

Note that the word 'common' refers to the transistor component connected to both the INPUT and OUTPUT.  In the common emitter configuration for example, the emitter is connected to both the input and output. 

Table shows the comparisons of the three transistor configurations

 

 

Common Emitter

 

 

Common

Base

 

 

Common Collector

 

Current Gain

 

 

20 -200

 

(0.95 - 0.995)

 

20 - 200

 

Voltage Gain

 

 

100 - 600

 

500 - 800

 

<1

 

Power Gain

 

 

Highest

 

Medium

 

Lowest

 

Input Impedance

 

 

500 - 2000W

 

50 - 200W

 

20kW - 100kW

 

Output Impedance

 

 

10 - 50 KW

 

100 kW - 1MW

 

20 - 500W

 

I/P - O/P Phase

 

 

180°

 

In Phase

 

In Phase

 

Typical Use

 

Normal Amp

Impedance matching

(low to high)

Impedance matching

(high to low)

Posted Date: 9/14/2012 6:50:02 AM | Location : United States







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