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whya always shields lines connected to VSS

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penchal_gv

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Hi Friends,
Why we always shield lines connected to Ground(VSS) instead of power(VDD).

Thanks,
--Penchal
 

hi,

some high voltage MOS has guardring conencted to both VDD and GND

i think it depends on the structure
 

Most of the time we use shield lines to protect a signal line. Any unwanted noise that might affect our signal line will be easily be picked-up by the grounded shield lines being of low potential.
 

ground is usually less noisy than VDD. And we need the shield to be connected to a quite node. Otherwise the shield itself will couple nosie onto the signal line.
 

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