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Gain of Differential Opamp

KGF KING

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Hi everyone, I have a small question: why is the gain of the first stage given as Gm1(ro3∥ro4), and why isn’t Gm2G_{m2}Gm2 included? I’m also curious about how the voltage gain derivation works for a differential op-amp. I’ve tried finding materials to understand the derivation, but it’s been a bit challenging. If anyone has related resources or insights, I’d really appreciate your help. Thanks in advance!
 


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