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Common Emitter amplifier

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Khan740

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Hi,
Why there is phase change in Common Emitter Amplifier?
 

Syncopator

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There isn't. There is an inversion.

When the base of an NPN transistor goes positive the base-emitter current increases, and so, therefore does the collector current.

The increase in collector current produces a larger voltage drop across the collector load. The collector voltage therefore goes less positive.

And vice versa for a negative change at the base.

In a PNP transistor the action is similar, but the polarities are opposite to the NPN case.
 

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