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Cascode amplifier small signal equivalent circuit

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cascode amplifier small signal equivalent circuit

I've been trying to find the small signal equivalent model for the cascode BJT amplifier circuit below, however I don't think I am getting the right model, I can find the model for one transistor, but don't know how to find it for cascode transistors.

Anyone can tell me how the small signal model for this circuit should look like ?

Thanks in advance ^-^
 

cascode small signal equivalent

If you know the small signal equivalent for 1 transistor, Just plug it in this circuit to get the small signal equivalent of this circuit. What problem are you facing exactly?
 

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