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how to design a low noise LDO

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microstorm

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hello every one, i need to design a low noise LDO linear regulator whose noise is lower than 20µVrms(10~100KHz). i have adopted a low-pass filter to filter the noise of bandgap voltage, and i eager to know how to reduce the amplifier noise. how shoule i do and especially, what structure can i choose. thanks in advance!
 

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