Common emitter transistor configuration

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In a common emitter transistor configuration, grounding the emitter is essential for providing a return path for the base and collector currents, particularly in NPN transistors. While the emitter does not need to be physically grounded, it must have a path for current to flow back to the negative supply. Grounding the emitter enhances current gain from the base to the emitter and allows for significant voltage gain at the collector. This configuration is crucial for achieving effective amplification in transistor circuits. Understanding the role of grounding in this setup is vital for proper circuit design.
amaresh92
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would you please tell me,in common emitter transistor configuration what is the use of grounding the emitter?
thanks
 
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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?
 


vk6kro said:
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.
 


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
 
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