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An NPN transistor is used in common emit...

An NPN transistor is used in common emitter configuration as an amplifier with `1 k Omega` load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and `15 mu A` change in the base current of the amplifier. The input resistance and voltage gain are:

A

`0.33 kOmega,300`

B

`0.67 kOmega, 300`

C

`0.33 kOmega, 1.5`

D

`0.67 kOmega, 200 `

Text Solution

Verified by Experts

The correct Answer is:
B
`r_1=(10mV)/(15xx10^(-6))=0.67KOmega`
Av `=-betaR_L/r_i=((3mA)/(15muA))(1kOmega)/(2000)xx3=-300`
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