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in the low power ldo design how to improve the psr

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reg_ic

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hi:
i have a ldo using the 1.8 power supply and my sim result of the psr is only between the -35 and -30 dB in the normal case , if in the case pvt :ss 1.62 -55 the result will be poor , and the psr only reach -25dB ! i dont know how to improve the psr now and i want to know if this param is ok in the low suppy design? anyway , any ways can improve the psr without increasing the gain of the loop , pls give me some good advice ! thx !
 

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