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Consider the circuit shown in the Figure with 𝑉𝑖=3 V and 𝑉𝐶𝐶=12 V. Assume 𝑉𝐵𝐸=0.7 V and 𝛽𝑑𝑐=99 for the BJT ...

 

Q. Consider the circuit shown in the Figure with 𝑉𝑖=3 V and 𝑉𝐶𝐶=12 V. Assume 𝑉𝐵𝐸=0.7 V and 𝛽𝑑𝑐=99 for the BJT. Which of the following options is the correct value of the current 𝑰𝒐?



Here, feedback is negative 
so, V+ = V- 
Or, Vi = VE = 3V

Then, IE = 3 / 1 mA = 3 mA

On the other hand, Ic = β.IB and IE = Ic + IB
Or, IB = IE - Ic
Or, IB = 3 - β.IB
Or, IB(1+β) = 3
Or, IB = 3/100 mA = 30 micro-Ampere


Answer: Option D




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