Mayank
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Hi, As for your query, yeah, the PSRR of the opamp, and for that sake the whole BandGap, should be high....For high PSRR in BG ckt, we go for cascode structures....But as Jerry once suggested, cascode structures increase Noise at the output....There's a trade-off here. Along with the PSRR, input OFFSET of the opamp is also a critical figure...Pls. keep this also in mind while designing...
--Mayank
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