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GND FILLING

girish
If we provide gnd filling in the signal lyer having less route what will be advantage & disadvantage? is this will effect of impidence of the layer . Regards, Girish

  • Dear Girish,

    Pouring gnd in signal layers definetely increases the board performance.Also it gives good return path for the immediate signal layers and acts as a shield for the current layers.Also it will have impact on the impedance.

    Regards,

    Satya

  • Dear Satya, Thanks Satya for your response .Impact on impedance means how ? layer impedance? could you pls clarify reg. via to shape clearance! Consider the following example of layout (fig1.1), they have given 15mil clearance to via to shape ,shape will not enter b/t BGA via array so power distribution is not good , suppose if we reduce the via to shape clearance to 5.5 or 5 mil(within manufacturer limit) shape will enter b/t BGA via array & distribution of power also good (fig1.2) ,but what will bet the adverse effect ? Regards, Girish Kumar Bangalore
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