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NMOS as MOSC application in 2-stage OP miller compensation

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alias0823

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I have a question

Anyone use NMOS as MOSC application in 2-stage OP miller compensation?

It's p-sub bulk always at VSS, but it's source and drain connected to OP output terminal. This OP is used as output buffer, so the output voltage may vary from near-vss to near-vdd.
 

MOSC

if the output is near vdd, it's not a capacitor now. and the circuit will be unstable.
 

MOSC

MOSC is MOS Capacitor used in the Miller Compensation
 

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