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In a common emitter BJT amplifier, the input signal is applied to which terminal?
Collector
Base
Emitter
Ground
Base
In a Common Emitter (CE) configuration of a Bipolar Junction Transistor, the input signal is applied between the base and emitter terminals. The emitter acts as the common terminal for both input and output circuits.
In a Common Emitter (CE) configuration of a Bipolar Junction Transistor, the input signal is applied between the base and emitter terminals. The emitter acts as the common terminal for both input and output circuits.
icтАЛ=╬▓ibтАЛ тАФ Relation between collector current and base current
AvтАЛ=vinтАЛvoutтАЛтАЛ=тИТr╧АтАЛ╬▓RcтАЛтАЛ тАФ Voltage gain expression for CE amplifier
The input signal voltage VbeтАЛ modulates the base current ibтАЛ. Due to the transistor's current gain property, small changes in the base current result in large changes in the collector current icтАЛ=╬▓ibтАЛ, where ╬▓ is the forward current gain. This resulting current flows through the collector resistor to produce an amplified voltage at the output.
The CE configuration provides both voltage and current amplification.
The input impedance is moderate, and the output impedance is relatively high.
There is a 180┬░ phase shift between the input and output signals in the CE configuration.
This configuration is the most widely used BJT amplifier stage due to its high power gain.
High voltage gain
High power gain
Good impedance matching
Phase inversion (180┬░)
Poor high-frequency performance compared to Common Base
Thermal instability if biasing is not managed
Audio frequency amplifiers
Radio frequency signal amplification
Intermediate stage in multistage amplifiers
Collector is typically used for taking the output signal.
Emitter is the common terminal in this configuration.
Base is the input terminal where the signal is fed.
B is correct тАФ In the Common Emitter (CE) configuration, the base terminal serves as the input port while the emitter is shared between input and output.
Always remember the 'common' terminal is never used for input, and the output is typically taken from the collector in CE, common base in CB, or emitter in CC (Emitter Follower).