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A common emitted amplifier circuit, buil...

A common emitted amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is `250,R_(C)=1Komega` and `V_(C C)=10V`. What is the minimum base current for `V_(CE)` to reach saturation?

A

` 40 mu A `

B

`7 mu A `

C

` 100 mu A `

D

` 10 mu A `

Text Solution

Verified by Experts

` Delta I _ C = (V_ (C C ) ) /( R _ C ) `
` beta = (Delta I _ C ) /( Delta I _ B ) `
` Delta I _B = ( Delta I _ C) /( beta ) = ( V _ (C C ) ) /( R _ C * beta ) `
putting the values we get
` Delta I _ B = 40 mu A `
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