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Why is shielding done only with power and ground?

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siddharth1501

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hi all

why sheilding is done only with power and ground?


regards

siddu
 

Re: sheilding

hey,

Do you mean why sheilding is tie or connected to POWER or GND?
 

sheilding

because that is DC. If sheild voltage changes a lot, it will affect the signal.
 

Re: sheilding

Right VDD and GND are DC signals, but even though u can see noise bounces in both power lines. Can u plz tell me how it will be effected with this ?
 

Re: sheilding

Yes there are POWER/GND bounces, but still they are far better than other switching signal couplings.
 

power or gnd bounce will result in a glitch in the shielded line...usually gnd is preffered
 

siddharth1501 said:
hi all

why sheilding is done only with power and ground?


regards

siddu
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usually shielding requires a low impedance, low noise net, this usually correspond to a supply net. In general you can use any low impedance net even a dedicated one for shielding
 

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