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amaresh92
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would you please tell me,in common emitter transistor configuration what is the use of grounding the emitter?
thanks
thanks
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?
A common emitter transistor configuration is a type of transistor circuit where the emitter terminal is connected to ground and the input signal is applied to the base terminal. The output signal is taken from the collector terminal.
Some advantages of using a common emitter transistor configuration include high voltage gain, high input impedance, and the ability to amplify both AC and DC signals. It also allows for easy biasing and can be used in a wide range of applications.
In a common emitter transistor configuration, the input signal at the base terminal causes a small change in the base current, which in turn causes a larger change in the collector current. This amplification is due to the transistor's ability to control the flow of current between the collector and emitter terminals.
Some limitations of using a common emitter transistor configuration include low power efficiency, high output impedance, and the potential for thermal runaway. It also requires careful biasing and can be susceptible to noise and instability.
The current gain, also known as the beta (β) value, can be calculated by dividing the collector current (IC) by the base current (IB). This value can vary depending on the specific transistor used and the operating conditions, but is typically in the range of 50-200.