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Net shorting (Digital and Analog Grounds) in physical design and validation at Netlist level

Sam Mirza

Hello folks,

Does anyone has carved a effective net shorting and validation methodology.

I need to short my nets at multiple instances of Analog and Digital GNDs.

Later once the design is done i need to carve a process to validate the design and logic together.

Any ideas/thoughts!!!! SiP/Allegro and SCM tools are used for design.

Regards

  • I drive all net shorts from the schematic and pass the net and component info to the PCB Editor. For a net short on the schematic to tie in analog to digital ground I use zero ohm resistors.

    This is a safe way to do things because both schematic and board netlist will match.

    If you cant do that you can cheat the pcb system :)

    Assume you have two copper planes, Gnd and Agnd and they need to be connected together. On another board layer draw a shape so it overlaps the two planes. Then when you generate your gerbers output that additional layer too. When you look at the gerbers both planes will be shorted.

    The safest method is to drive everything from the schematic.

    Scott 

     

  • Hi Sam Mirza,

    If you directly short the digital ground  & Analog ground,it will consider as a single net.

    Inorder to achieve what you need,simply use a compoonent called cut trace ot internal short component.

    Create a component  like 0603 resistor and short the pads of the component and place this component in sch and in layout too.

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