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+12V转+5V,+5V转-5V,+—5V电压用于给运放供电,怎样才能使输出纹波最小啊?

Other Parts Discussed in Thread: TPS54160A, TPS54060, TPS54061, TPS54040, TPS7A49, TPS7A30, TPS7A47, TPS7A33, TPS54560

如题所示,输入电压+12V,做后要得到+-5V的稳压电源,要求纹波输出尽可能小,因为这里运放的输入信号也是特别小的信号,

主要的思路是先是DC-DC,再用LDO,这里的芯片如何选型,希望各位大神赐教!