In a P N P transistor working as a common-base amplifier,...

In a $P N P$ transistor working as a common-base amplifier, current gain is $0.96$ and emitter current is $7.2 \mathrm{~mA}$. The base current is
(A) $0.4 \mathrm{~mA}$
(B) $0.2 \mathrm{~mA}$
(C) $0.29 \mathrm{~mA}$
(D) $0.35 \mathrm{~mA}$

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Key Concepts

Common-Base Amplifier

A common-base amplifier is a transistor configuration where the base terminal is common to both the input and the output circuits. This configuration offers high voltage gain, low input resistance, and good performance at high frequencies, making it suitable for specific signal processing applications.

Transistor Current Gain (Alpha)

Transistor current gain in a common-base configuration, represented as ?, is defined as the ratio of the collector current to the emitter current. This parameter, always less than one, indicates the efficiency with which the transistor transfers carriers from the emitter to the collector.

Current Relationships in Transistor Operation

In any bipolar junction transistor, the emitter current is the sum of the collector and base currents. This basic relationship, expressed as I_E = I_C + I_B, is fundamental in analyzing and designing transistor amplifiers, allowing derivation of one current when the others and the current gain are known.

PNP Transistor Characteristics

A PNP transistor is a type of bipolar junction transistor where the majority charge carriers are holes. It features a layer of N-doped semiconductor sandwiched between two P-doped layers and operates with the emitter supplying holes to the base, supporting roles in amplification and switching circuits.

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