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In the common emitter amplifier circuit,...

In the common emitter amplifier circuit, Fig. an npn transistor with output voltage of the amplifier as 1 V, the current gain of transistor amplifier is :

A

20

B

25

C

50

D

75

Text Solution

Verified by Experts

The correct Answer is:
C
`A_(v)=V_(0)/V_(i)=betaR_(0)/R_(BE)`
`beta=V_(0)/V_(i)xxR_(BE)/R_(0)=(1V)/(2mV)xx(1kOmega)/(10kOmega)=50`
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Knowledge Check

  • In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be:-

    A
    `180^(@)`
    B
    `45^(@)`
    C
    `90^(@)`
    D
    `135^(@)`

  • For a transistor amplifier, the voltage gain

    A
    remain constant for all frequencies
    B
    is high at high and low frequencies and constant in the middle frequency range
    C
    is low at high and low frequencies and constant at mid frequencies
    D
    none if the above

  • For transistor amplifier, the voltage gain

    A
    remains constant for all frequencies
    B
    is high and low frequencies and constant in the middle frequency range
    C
    is low at high and low frequencies and constant in the mid frequencies
    D
    None of the above.

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