In which case vdd shielding

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rojalin

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can I know In which scenario Vdd is used as shield instead of VSS?

thanks
 

rojalin said:
can I know In which scenario Vdd is used as shield instead of VSS?
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It doesn't matter if you shield by VSS or Vdd: In terms of ac shielding they are identical. Use that one which is more simple (shorter) to connect with.
 

If you have a supply referred node. it would be useful to have shielding using VDD lines. This would improve PSRR.

For example, a PMOS gate bias for a current mirror. It is a supply referred node. and and needs to be tightly coupled to supply in order to reject supply noise and hence improve PSRR.
 

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