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I am finding the bandwidth of hybrid-π BJT. This picture is from my tutorial. If I have gm,RB,RL,Cπ,rπ,Cμ, is it possible to get bandwidth without r0? As what I understand, if need Cin using Miller Effect, we need gain. But the gain depends on r0//RL.

enter image description here

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  • \$\begingroup\$ It is common to ignore \$r_o\$ for BW in all cases when \$R_L<<r_o\$ \$\endgroup\$
    – D.A.S.
    Commented Nov 20 at 6:27

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Some time ago I did a complete study of the bjt ce, I think it might interest you, you can find it here: https://i.sstatic.net/JHXd6n2C.png (you have to zoom), (Sorry, the chosen bjt is the 2N4400 and not the BC547C.).

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