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Can you please explain the Input output phase relationship in Common emitter transistor and why it is different from Common Base and Common collector transistors? 

Asked by rajuharan 22nd January 2017, 10:44 PM
Answered by Expert

In a CE transistor amplifier circuit, as the input voltage rises the current increases through the base circuit. This causes an increase in the current through the collector circuit, i.e. it tends to turn the transistor on. This results in the voltage between the collector and the emitter terminals to fall.

In this way an increase in voltage between the base and emitter has resulted in a fall in voltage between the collector and emitter terminals. In other words the phase of the two signals has been inverted. 

In CB and CC configurations this phase is not inverted and are called non-inverting amplifiers.

Answered by Expert 24th January 2017, 6:35 PM
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