Common Base Configuration of BJT | CB Configuration of transistor

Common Base Configuration of BJT | CB input/output characteristics of BJT
The common base (CB) configuration is one of the three basic configurations of a bipolar junction transistor (BJT). In this configuration, the base terminal is common to both the input and output circuits.

Circuit Diagram
Characteristics
Input: The input is applied to the emitter terminal, and the input current is denoted as IE.
Output: The output is taken from the collector terminal, and the output current is denoted as IC.
Common Terminal: The base terminal is common to both the input and output circuits.
Current Gain
The current gain in the common base configuration is denoted by α (alpha). It is defined as the ratio of the collector current to the emitter current:

α = IC / IE
Typically, α is a value close to unity (e.g., 0.98).

Input Impedance
The input impedance of a common base configuration is relatively low and is primarily determined by the emitter-base junction resistance.

Output Impedance
The output impedance of a common base configuration is relatively high and is primarily determined by the collector-base junction resistance.

Applications
Current amplifiers: The common base configuration is often used as a current amplifier due to its high current gain.
Voltage amplifiers: In certain applications, the common base configuration can be used as a voltage amplifier, especially when a high input impedance is required.
RF amplifiers: Due to its low input impedance and high frequency response, the common base configuration is often used in high-frequency applications such as radio frequency (RF) amplifiers.
Advantages and Disadvantages
Advantages:

High current gain
Low input impedance
High frequency response
Disadvantages:

Low voltage gain
Relatively high output impedance
In summary, the common base configuration offers a unique set of characteristics that make it suitable for specific applications, particularly those requiring high current amplification or high-frequency operation.
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