SATHEE: Semiconductor Electronics Materials Devices and Simple Circuits

Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 79

81. The current gain for a transistor working as common-base amplifier is 0.96 . If the emitter current is $7.2 m A$ , then the base current is

(a) $0.29 m A$

(b) $0.35 m A$

(d) $0.43 m A$

[1996]

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Answer:

Correct Answer: 81. (a)

Solution:

(a) Current gain $(α) = 0.96$

$I_{e} = 7.2 m A$

$\frac{I_{c}}{I_{e}} = α = 0.96$

$I_{c} = 0.96 \times 7.2 m A = 6.91 m A$

$I_{e} = I_{c} + I_{b}$

$\overset{e}{\Rightarrow} I_{b}^{c} = I_{e} - I_{c} = 7.2 - 6.91 = 0.29 m A$

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Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 79

81. The current gain for a transistor working as common-base amplifier is 0.96 . If the emitter current is 7.2mA, then the base current is

Answer:

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81. The current gain for a transistor working as common-base amplifier is 0.96 . If the emitter current is $7.2 m A$ , then the base current is