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An NPN BJT having reverse saturation cur...

An NPN BJT having reverse saturation currents `I_S=10^(-15)` A is biased in the forwared active region with`V_BE`=700mV and the current gain `(beta)`may vary from 50 to 150 due to manufacturing variation. What is the maximum emitter currents(in`mu`A).

Text Solution

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`I_S=10^(-15)A`
`V_BE=0.7`
`V_T=25mV`
`beta` range from 50 to 150
`I_C=I_o e^(V_BE//V_T)`
`I_E=(beta+1)/(beta)I_C`
`I_E=(beta+1)/(beta)I_Se^(V_BE//V_T)`
`I_E`be maximum when `beta` is 50
`=1.02xx10^(-15)xxe^(700xx10^(-3)//25xx10^(-3))`
`I_E=1475muA`
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