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Question about DC-DC followed by LDO?

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colinwang

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Hi all,
In portable applications, usually a buck converter followed by a LDO are used to provide the power supply. The switching frequency of DC-DC converter is usually 1MHz, and that is to say the LDO should have a rather high PSRR(40-60dB) at 1MHz to minimize the output ripple of buck.
How can this kind of LDO be realized?

Thank you!
 

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