                    ⁢                                                                      r                  e                                +                                  0                                      g                    m                                                  +                                  0                                                            ω                      T                                        ⁢                                          C                      d                                                                                                  (                                                      r                    b                                    +                                      r                    e                                                  )                                                                        [                  Equation          ⁢                                          ⁢          0                ]             Here,             ω      T        =                  0        ⁢        π        ⁢                                  ⁢                  f          T                    =                        g          m                                      C            π                    +                      C            μ                                ,and fT, gm, rb, and re denote a maximum transition frequency, a transconductance, an intrinsic base resistance, and an emitter resistance of a transistor