The phase shift in common emitter amplifiers is
The phase shift in common emitter amplifiers is
The correct option is B 180o
Common emitter transistor amplifier characteristics:PARAMETER CHARACTERISTICS Voltage gain Medium Current gain Medium Power gain High Input / output phase relationship 180o Input resistance Medium Output resistance Medium
Common emitter input-output phase relationship:
The common emitter transistor amplifier is the only configuration that gives an inversion, 180o, between the input and output signals.
The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit. In turn this increases the current thought the collector circuit, i.e. it tends to turn the transistor on. This results in the voltage between the collector and emitter terminals falling.
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.
| PARAMETER | CHARACTERISTICS |
|---|---|
| Voltage gain | Medium |
| Current gain | Medium |
| Power gain | High |
| Input / output phase relationship | 180o |
| Input resistance | Medium |
| Output resistance | Medium |
Common emitter input-output phase relationship:
The common emitter transistor amplifier is the only configuration that gives an inversion, 180o, between the input and output signals.
The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit. In turn this increases the current thought the collector circuit, i.e. it tends to turn the transistor on. This results in the voltage between the collector and emitter terminals falling.
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.
