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For a CE -transistor amplifier the audio...

For a CE -transistor amplifier the audio signal voltage across the collector resistance of 2 k`Omega `is 2V. Suppose the current amplification factor of the transistor is 100 find the input signal voltage and base current if the base resistance is 1 k `Omega`.

Text Solution

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Voltage amplification factor,
`A_(v)=(V_(0))/(V_(i))=beta(R_(C))/(R_(B)):.V_(i)=(V_(0)R_(B))/(betaR_(C))`
Now `V_(0)=2V,R_(B)=1k Omega=1000 Omega`
`beta=100,R_(C)=2kOmega=2000Omega`
`:. V_(i)=(2xx1000)/(100xx2000)=0.01`V
`I_(B)=(V_(i))/(R_(B))=(0.01)/(1000)=10^(-5)"A"=10 mu`A
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