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capacitive divider noise

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Arielle

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Hi,
can someone please explain to me why the input-referred noise of the overall amplifier is given by that expression:
eq.PNG
for such a feedback structure? Cp is the parasitic capacitance from the input transistors of the OTA. This information is taken from a book and I don't understand especially the capacitive divider term... please help me
schematic.PNG
Regards,
Arielle
 

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