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Multipe GND signals in CHIP level

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sundarr

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Why do we have GND signals different for each module eventhough all these GND signals are going to connect same single pin in CHIP level???

Ex:
For module1 ----> GND_module1_*
For module2 ----> GND_module2_*

But in CHIP level

Above said GND signals are star connected to one common pin GND_*
 

Re: Multipe GND signals

sundarr said:
... GND signals are star connected to one common pin GND_*
Click to expand...
The various GND_moduleX_* route parts carry different currents and current waveforms, and own different R-L-C parasitics after parasitics' extraction. Hence the interference signals (noise, EMI) on the various GND_* nodes will be different, and it is possible to analyse these different EMI voltage levels by postLayout simulation after parasitics' extraction.
 

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