Which of the statement is incorrect?(a) At unity gain frequency the CE short circuit current gain becomes 1(b) Unity gain frequency is the same as Gain Bandwidth Product of BJT(c) Gain of BJT decreases at higher frequencies due to junction capacitances(d) β- cut-off frequency is one where the CE short circuit current gain becomes β/2This question was posed to me in an interview for internship.This intriguing question comes from High Frequency Response in section Transistor Frequency Response of Analog Circuits

Which of the statement is incorrect?(a) At unity gain frequency the CE

1.	Which of the statement is incorrect?(a) At unity gain frequency the CE short circuit current gain becomes 1(b) Unity gain frequency is the same as Gain Bandwidth Product of BJT(c) Gain of BJT decreases at higher frequencies due to junction capacitances(d) β- cut-off frequency is one where the CE short circuit current gain becomes β/2This question was posed to me in an interview for internship.This intriguing question comes from High Frequency Response in section Transistor Frequency Response of Analog Circuits
Answer» Correct answer is (d) β- cut-off frequency is one where the CE short CIRCUIT CURRENT gain becomes β/2 Easy explanation: At unity gain frequency the current gain is 1 is a correct statement. The same frequency is fT = βfβ which is the gain bandwidth product of BJT. Gain of BJT at high frequency decreases due to the junction capacitance. However, at β cut-off frequency, current gain becomes \(\frac{β}{\sqrt{2}}\).

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