Hi Am trying to understand what am doing wrong, I connected CE to CC with a small Rload am designing it so Zout of the second stage equal Rload to get Maximum output.
From what i read in CC-amp Zout = RE||(r'e+ ((R1||R2||RS)/Bac)) were RS is the source resistance, i figured since CC-amp is connected to CE-amp then RC takes place of RS.
I reedited the calculation and obviously it came out wrong.
Bac = 100 Rload = 30 RS= RC = 1800 (R3 || R4 || RS) / Bac = 18 since RS << R3||R4 r'e + 18 = 30 => r'e = 12 IE = 25mV /r'e = 2.08mA RE = 100*Rload = 3000 VE = 6.24V Zout = RE||(r'e+ ((R3||R4||RS)/Bac)) = 29.7 Zout = Rload
Recalculate DC for final result
Vth = VE +VBE + Delta= 7.2V Rth = Bdc(Vth - VBE / IE - RE) = 12500 R3 = Rth * (VCC / Vth ) = 15625 R4 =1/ (1/Rth - 1/R3) = 62500
Tried different ways but nothing, is the cutoff caused by first stage i tried to keep Q1 in midpoint and without CC it Amplifies signal without distortion, is it a cap problem or is it cause the current is to high