Question

In a common base transistor circuit, ${I_C}$ is the output current and ${I_E}$ is the input current. The current gain a pc is
A) Equal to one
B) Greater than one
C) Less than one
D) None of the above

Answer 1

The input terminal is the common base configuration emitter, the output terminal is the recorder, and the base terminal is connected for both input and output as a common terminal. That means that the Emitter terminal is referred to as input terminals and the typical base terminal is referred to as output terminals.

Complete step by step solution:
The common base amplifier is also a kind of bipolar June resistor, (BJT), where both the input and the output signals are common terminals of the base terminal of the transistor, and hence their common name (CB). The common base setup is less common than the most common (CE) or common (CC) emitter configuration as an amplifier; but still used because of its unique input / output properties.

The input signal is applied to the emitter terminal and the output is taken from the collector terminal for the common base configuration to be used as an amplifier. Therefore the emitter current is also the input current and, since the transistor is a three layer two pn-connecting unit, it has to be properly positioned to function as the typical base amplifier. It also has a collector current. This is a forward-looking basis crossing.

In common base transistor circuit, the current gain ${\alpha _ {DC}} = \dfrac{{{I_C}}}{{{I_E}}}$ is less than one.

Note: According to its input-output impedance features, the typical base amplifier configuration is incredibly useful in the sense of audio and radio frequency equipment as an established buffer to balance a low-impedance source with a high load or, whether you are a cascade or multi-stage amplifier, to drive another amplifier.