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Re: Difference between Poly cap and transistor used as a cap
Poly-poly cap is almost constant with zero voltage coefficient, MOS cap is nonlinear with voltage coefficient and saving a layer mask of poly2(this is usually important), good designers can always use MOS caps
Re: PSRR of LDO?
‘Shield the error amplifier from the power supply’ does not mean to make EA output stable against GND, but against VIN, so your 2 questions which look incompatible is exactly the same.
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