Bipolar junction transistors have different configurations based on the common contact.
The common base configuration features a shared base terminal for the input and output.
It exhibits unusually high voltage gain, making it suitable for single-stage amplifier circuits like microphone pre-amplifiers. However, it attenuates the input current signal as the collector current output is less than the emitter current input.
In contrast, the common emitter configuration, which is the most popular for transistor-based amplifiers, has a greater input impedance, current, and power gain than the common base configuration.
This configuration acts as an inverting amplifier circuit, with the output signal 180 degrees out-of-phase with the input voltage signal.
Finally, the common collector configuration, also known as the voltage follower circuit, possesses very high input impedance and relatively low output impedance.
While its voltage gain is less than unity, it provides significant current amplification. This non-inverting configuration is beneficial for impedance-matching and voltage-buffering applications.

configurations of bjt

Bipolar Junction Transistors (BJTs) are categorized into various types based on their configurations, each with distinct characteristics and applications. The configurations are primarily differentiated by which terminal&#8212;base, emitter, or collector&#8212;is common to both the input and output circuits.
The common base configuration is noted for its high voltage gain, positioning it as an ideal choice for single-stage amplifier circuits, such as microphone pre-amplifiers. A notable characteristic of this configuration is its tendency to reduce the input current signal, as the output collector current is typically lower than the input emitter current.
Conversely, the common emitter configuration is the most widely used type in transistor-based amplifiers, owing to its superior input impedance, current, and power gain compared to the common base setup. It functions as an inverting amplifier, producing an output signal that is 180 degrees out-of-phase with the input signal, making it essential for various amplification needs.
Lastly, the common collector configuration, also known as the emitter follower or voltage follower circuit, is recognized for its exceptionally high input impedance and relatively low output impedance. Although its voltage gain is slightly less than one, it provides substantial current amplification. This configuration, which does not invert the input signal, is particularly useful for impedance matching and serving as a voltage buffer in numerous applications. Each configuration offers unique advantages, making BJTs versatile components in electronic circuit design.

Configurations of BJT

Bipolar junction transistors have different configurations based on the common contact.
The common base configuration features a shared base terminal for ...