About regulator's psrr

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Alan_Nesta

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I have made a regulator, which can drive 100mA current and 400pF capacitance, so the output device is large, and with Miller compesation(about 20pF) the PSRR+ is bad! only 70-80dB@dc and about 10dB@1MHz
how can i correct this?
Thank you
 

Maybe you should give out the more detailed information about your linear reg?
 

70-80 dB@DC is a good spec.
The normal spec. of LDO is olny 60-70dB



The PSRR in high frequency alway indue a signal (psrr ) from power by parasitic cap. if you will reduce psrr ,you must care it.
 

at high frequency, the psrr is bad! mostly, we test it at lowfrequency.
 

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