An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

A. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.

B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 HzCorrect Answer

C. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

D. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

Correct Option: B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

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