The fT of a BJT is related to its gm, `C_pi` and `C_mu` as follows
`f_T` = ``` ` `(C_pi + C_mu)/delta_m`
`f_T` = `(epi( C_pi + C_mu))/delta_m`
`f_T` = `delta_m/(C_pi + C_mu)`
`f_T` = `delta_m/(2pi(C_pi + C_mu))`
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