Voltage gain = Current gain x Resistance gain Av=β×
Rout
Rin
Transconductance,gm=
β
Rm
or Rin
β
gm
∴Av=gmRout For first case,Av=G,gm=0.03mho,β=25 ∴G=0.03Rout.......(i) ∴Av=gmRout For Second case,Av=G′,gm=0.02mho,β=20 ∴G′=0.02Rout.......(ii) Divide (ii) by (i), we get