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haidi.elbahr said:i think you will find psrr-shap is opposite to open loop gain
ashish_chauhan said:Yes ... the shape is almost the same as that of ur loop gain...
I fact the psrr curve of regulator can be divided in three regions..
1) in the first part the psrr i dominated by the psrr of bandgap... till the cut off freq of b'gapfilter.
2) in the second halffrom cut off of the b'gap to the ugf of loop... the psrr is dominated by loopgain of regulator.
3)and after that once the loopgain is out the output cap holds the forte... which is finally saturated by the pesence of ESR.
you can find a more detailed description on this at ti.com... in the analog journal.
Do you mean that at the following region the PSRR degrades due to BandGap psrr degradation?ashish_chauhan said:in the first part the psrr i dominated by the psrr of bandgap... till the cut off freq of b'gapfilter.