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Connecting to GND and VCC planes while routing

AKSHAYA

Hi

    I have created a board with four layers. The inner layers are ground and VCC and the VCC and GND nets of the circuit made electrically connected to these planes by changing the net name. How we can connect the top and botton VCC and GND tracks to these planes. Is it possible using via, burried via or blind via. Whether we can put vias where ever connections are required or we have to connect using only one two vias. If vis is to be used what should be  the specifications of thermal pad and anti pad?. I am using only SMD pads.

Hope somebody may be able to help me 

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  •  Hi

    Not to bust the  excitement, there is no such thing as automatic via selection

    You have to first figure out which Via technology  you are using and setup according to it,

    If you go with blind via then you have setup the board such that when a signal is routed from top layer the proper via will be selected and the same works for the bottom layer

     Generally microvia/blind/burried via costs atleast 2-3 times more than that of regular via.

    The HDI vias are used exclusively in complex high speed designs with high layer count unless your company don't care about the money you could use in any designs

    I haven't used HDI vias in an 4 layer board

    regards

    Venkata

Reply

  •  Hi

    Not to bust the  excitement, there is no such thing as automatic via selection

    You have to first figure out which Via technology  you are using and setup according to it,

    If you go with blind via then you have setup the board such that when a signal is routed from top layer the proper via will be selected and the same works for the bottom layer

     Generally microvia/blind/burried via costs atleast 2-3 times more than that of regular via.

    The HDI vias are used exclusively in complex high speed designs with high layer count unless your company don't care about the money you could use in any designs

    I haven't used HDI vias in an 4 layer board

    regards

    Venkata

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