Why do we require RE for a good stable alpha cutoff frequency?(a) To obtain a current IE sensitive to α and VBE(b) To obtain a current IB sensitive to α and VBE(c) To obtain a current IE insensitive to α and VBE(d) To obtain a current IB insensitive to α and VBEThis question was addressed to me in quiz.This intriguing question comes from The Alpha Cutoff Frequency topic in portion High Frequency Transistor of Electronic Devices & Circuits

Why do we require RE for a good stable alpha cutoff frequency?(a) To o

1.	Why do we require RE for a good stable alpha cutoff frequency?(a) To obtain a current IE sensitive to α and VBE(b) To obtain a current IB sensitive to α and VBE(c) To obtain a current IE insensitive to α and VBE(d) To obtain a current IB insensitive to α and VBEThis question was addressed to me in quiz.This intriguing question comes from The Alpha Cutoff Frequency topic in portion High Frequency Transistor of Electronic Devices & Circuits
Answer» Right answer is (c) To obtain a CURRENT IE insensitive to α and VBE To elaborate: The aim of having an alpha cutoff frequency is to maintain a STABLE current or voltage, REGARDLESS of other parameters changing. Hence, we need RE to GET a stable IE current. Without RE the VALUE of IE changes drastically with a small change in α.

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