A transistor has fT = 500 MHz and βF = 75.
(a) What is the β-cutoff frequency fβ of this transistor?
(b) Use Eq. (5.42) to find an expression for the frequency dependence of αF - that is, αF (f). [Hint: Write an expression for β(s).] What is the α-cutoff frequency for this transistor?
