Transistor configurations, Other Engineering


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.


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 Collector


Current Gain



20 -200


(0.95 - 0.995)


20 - 200


Voltage Gain



100 - 600


500 - 800




Power Gain









Input Impedance



500 - 2000W


50 - 200W


20kW - 100kW


Output Impedance



10 - 50 KW


100 kW - 1MW


20 - 500W


I/P - O/P Phase





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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