Common Emitter Amplifier Without RE

AC analysis:

All the parameter of this configuration is same as common emitter with RE. A Only change is that put the value of RE =  0.

Voltage gain:

           Av = Vo/Vin

                             = -gm(Rc||RL||ro)

Current gain:

                      Av = -gmr𝝿  = -𝜷

Input resistance: 

                           RiB =  r𝝿

                                                    Ri =RTH||RiB

RiB  is input resistance looking into base of BJT

Ri is input resistance  of amplifier 

Ris is input resistance looking from source 

Output resistance:  Ro = Rc||RiB