The current gain of a common emitter amplifie | vedclass

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(B) Given,current gain of $CE$ amplifier $\beta = 69$ and emitter current $I_{E} = 7.0\,mA$.We know the relation between collector current $I_{C}$ and

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$6.9$

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(B) Given,current gain of $CE$ amplifier $\beta = 69$ and emitter current $I_{E} = 7.0\,mA$.We know the relation between collector current $I_{C}$ and emitter current $I_{E}$ is given by $I_{C} = \alpha I_{E}$,where $\alpha$ is the current gain in common base configuration.The relationship between $\alpha$ and $\beta$ is $\alpha = \frac{\beta}{1 + \beta}$.Substituting the value of $\beta = 69$,we get $\alpha = \frac{69}{1 + 69} = \frac{69}{70}$.Now,calculating the collector current: $I_{C} = \left( \frac{69}{70} ight) 	imes 7.0\,mA$.$I_{C} = 69 	imes 0.1 = 6.9\,mA$.

The current gain of a common emitter amplifier is $69$. If the emitter current is $7.0\,mA$,the collector current is.....$mA$.

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