Can someone explain what a cascode configurations purpose is? I have attached a schematic of it. I understand that Q5 and Q6 form a current mirror that makes the current running through their collectors the same assuming that they are the same transistors. But what is Q7, Q3 and Q4 doing? I believe that Q1 and Q2 form my differential amplifier which amplifies the difference of my input signal. Also why is Q7 a pnp and Q3 and Q4 a npn?
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