Common emitter transistor configuration

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Discussion Overview

The discussion revolves around the common emitter transistor configuration, specifically focusing on the role of grounding the emitter. Participants explore the implications of grounding in relation to current paths and voltage gain, as well as the necessity of grounding in various configurations.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asks about the purpose of grounding the emitter in a common emitter configuration.
  • Another participant clarifies that the emitter does not need to be physically grounded but must provide a return path for base and collector currents as emitter current.
  • A third participant expresses confusion about the conditions under which grounding is applied in this configuration.
  • A fourth participant explains that in the common emitter configuration, grounding the emitter allows for current gain from the base to the emitter and a significant voltage gain at the collector.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the necessity and implications of grounding the emitter, with multiple perspectives presented regarding its role and function.

Contextual Notes

Some participants mention alternatives such as using an emitter resistor, indicating that the discussion may depend on specific configurations and assumptions about the 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
 
Last edited:

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