Sunday, June 8, 2008

13_ Common Emitter Amplifier Tutorial

Common Emitter Amplifier Tutorial

Sometimes called the grounded emitter, since the emitter capacitor connects the emitter to ground at ac frequencies.
Common Emitter Amplifier
Since, as far as ac is concerned, the emitter is joined to ground, both input and output are connected to the emitter.
Current gain is Ic/Ib and can be quite high, typically 50.
Voltage gain is high, typically 250
Input impedance is medium, say 5K.
Output impedance is medium, say 20k.
The output is inverted with respect to the input.
Its most common application is as a voltage amplifier.


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