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How to properly measure PSRR for bandgap?

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surianova

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hi!

When i measure the PSRR for bandgap, shd i measure together with power supply filter? or just bandgap alone?
 

PSRR for bandgap

If the power supply filter is being used in the system then it makes more sense to simulate the BGR PSRR with the filter.
 

Re: PSRR for bandgap

It depends on how to define the PSRR of bandgap, only from circuit view or from the whole system view.
 

Re: PSRR for bandgap

.EXTRACT AC LABEL = PSRR_min FILE=PSRR.aex MAX(Vdb(VBG))
.EXTRACT AC LABEL = PSRR_dc FILE=PSRR.aex yval(Vdb(VBG),1)
.EXTRACT AC LABEL = PSRR_min_freq FILE=PSRR.aex XMAX(Vdb(VBG))
 

PSRR for bandgap

Use the filter will be batter to reflact the practical situation.
 

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