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how to improve psrr of ldo

热度 1已有 1808 次阅读| 2007-11-19 15:07

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how to improve psrr of ldo

i just designed a ldo, and the psrr is not too good. as spec request : 60db@10k

my question is :

1. if there are 3 sub-modules in my ldo , then psrr of ldo depends on the minmum psrr of the sub-module ,is that right ?
2. i wanna a psrr of 60db@10k ,however,my bandgap's psrr is 57db@10k. then i checked the psrr of the opamp used in bandgap.which is 60db@100k and meets my needs. so how can i improve my psrr of bandgap without increase the Ac gain of opamp