Graph for PSRR bandgap

[surianova]

Hi



The graph shows the PSRR for bandgap with filter at the power supply VDD33A.



The red colour is the frequency response of the filter with 35 KHz bandwidth.
The blue colour is PSR for Bandgap itself.
The pink colour is the combination of power supply filter and bandgap.


The worst PSR is at 23 KHz with -30 dB. The peaking of the filter is quite high.



Is it ok the PSR for the bandgap from the graph?

 

[pfd001]

The PSRR is enough or not depending on you spec. The problem is why you use such supply filter? where is peak ffrom?

 

[leo_o2]

To improve high-frequency PSRR? For generally application, it is enough.