A common emitter amplifier is designed with n-p-n transistor (α=0.99).

A Common Emitter Amplifier Is Designed With Npn Transistor 099 Physics QuestionA Common Emitter Amplifier Is Designed With Npn Transistor 099 Physics Question

A common emitter amplifier is designed with n-p-n transistor (α=0.99). The input impedence is 1kΩ and load is 10kΩ. The voltage gain will be

Options

(a) 9900
(b) 99
(c) 9.9
(d) 990

Correct Answer:

990

Explanation:

Voltage gain = β × Resistance gain

β = α/(1-α) = 0.99 / (1-0.99) = 99

Resistance gain = (10 × 10³) = 10

Voltage gain = 99 × 10 = 990

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