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In the circuit given, the two Si transistors are similar. Given β=50, Vcc=12V, I1=5mA. Find I?(a) 5 mA(b) 4.807 mA(c) 4.5 mA(d) 5.2 mAI got this question in exam.Asked question is from Transistor Bias Configuration topic in portion Transistor Biasing and Low Frequencies of Analog Circuits

Answer»

Correct choice is (B) 4.807 mA

Best explanation: The circuit is a current MIRROR circuit. Both transistors are SIMILAR. I1= IREF = 5 mA

Β is not large so 2/β is not negligible.

Thus current I = I1/(1 + 2/β) = 5mA/(1 + 2/50) = 4.807 mA.



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