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The reasons behind noise in LDO

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liuyonggen_1

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hello , friends i need you help!

i would like to know some basic principle about the noise in the LDO, some papers said the position of the poles and the zeros affects the nosie in some degree,could you tell me some principles,thanks a lot!
 

sunking

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the noise in the LDO

the poles and the zeros affect the tansfer function of noise, so them will affect the noise.
 

liuyonggen_1

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Re: the noise in the LDO

sunking said:
the poles and the zeros affect the tansfer function of noise, so them will affect the noise.
thank you! i think so. could you show me some papers about how to decrease the noise of LDO
 

Chethan

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Re: the noise in the LDO

attaching the pdf
"A better approach of dealing with ripple noise of LDO".
It may be helpful for u in design

Added after 29 minutes:

here
 

Chethan

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Re: the noise in the LDO

attaching the pdf
"Understanding noise in linear regulators"
 

liuyonggen_1

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Re: the noise in the LDO

Chethan said:
attaching the pdf
"A better approach of dealing with ripple noise of LDO".
It may be helpful for u in design

Added after 29 minutes:

here

thank you for you help!

Added after 16 minutes:

liuyonggen_1 said:
sunking said:
the poles and the zeros affect the tansfer function of noise, so them will affect the noise.
thank you! i think so. could you show me some papers about how to decrease the noise of LDO
did what you said mean that we can see the noise as the input signal?
but the SNR is the same
or did what you said mean we can distribute the gain of every stage properly to decrease the noise because every stage will contribute to the input reference noise
 

ks-7

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Re: the noise in the LDO

hi!
You can reference this paper,maybe have some help to you!
 

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