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Exam Questions Papers - Engineering
Q1: For a npn BJT transistor fβ is 1.64 x 108 Hz. Cμ = 10-14 F; Cp = 4 x 10-13 F and DC current gain is 90. Find fT and gm (fβ = cut off frequency, Cμ = capacitance, Cp = parasitic capacitance, gm = transconductance, fT = gain BW product)A
fT = 1.47 x 1010 Hz ; gm = 38 milli mho
B
fT = 1.64 x 108 Hz ; gm = 30 milli mho
C
fT = 1.47 x 109 Hz ; gm = 38 mho
D
fT = 1.33 x 1012 Hz; gm = 0.37 m-mh
ANS:A - fT = 1.47 x 1010 Hz ; gm = 38 milli mho ![]() ![]() |


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