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During high frequency applications of a B.J.T., which of the following three stages do not get affected by Miller’s approximation?(a) C.E.(b) C.B.(c) C.C.(d) FollowerI got this question in examination.The query is from Effect of Various Capacitors on Frequency Response topic in portion Transistor Frequency Response of Analog Circuits

Answer»

Correct answer is (b) C.B.

Easy explanation: During the C.B. stage, the capacitance between the base and the collector doesn’t suffer from Miller approximation since the INPUT is applied to the EMITTER of the B.J.T. There are no CAPACITORS connected between two nodes having a CONSTANT gain. Hence the C.B. stage doesn’t get AFFECTED by miller approximation.



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