Common emitter transistor configuration

[amaresh92]

would you please tell me,in common emitter transistor configuration what is the use of grounding the emitter?
thanks

 

[vk6kro]

The emitter doesn't have to be actually grounded, but it has to have a path for the base current and collector current to return to the negative supply (for an NPN transistor ) as emitter current.

Is that what you meant?
Or were you comparing it to the alternative of having an emitter resistor and then grounding that?

 

[amaresh92]

The emitter doesn't have to be actually grounded, but it has to have a path for the base current and collector current to return to the negative supply (for an NPN transistor ) as emitter current.

Is that what you meant?
Or were you comparing it to the alternative of having an emitter resistor and then grounding that?

actually i don't have any idea why and when we ground any terminal as it seems to be in the case of ce configuration.

 

[Bob S]

In the CE (common emitter) configuration, the base is the input and the output is the collector. There is a current gain from the base to the emitter, and a large voltage gain at the collector into a large load resistance when the emitter is grounded. In an npn transistor, the emitter is the source of both the base and collector electron currents when it is grounded.

Bob S