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EMIR Units

rafaelon

Hi,

I have doubt about units obtained in the report from EMIR simulator.

In the Power IR/EM user guide, the unit of current density limit is described as A/cm2 or mA/um for metal layers (width based).

What mean the current density unit be represented by mA/um?

Regards,

Rafael

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  • Tom Volden

    Current density in A/m^2 is area based, while A/m is width based.  When laying out ICs the height of a metal layer is fixed for a give metal based on the process so it is more efficient to specify current density as width based since width is the only degree of freedom that a designer has. If a metal in a hypothetical process has a current density of 0.1mA/um and you know that there is 0.25 mA going through a branch you need to have the line width at least 2.5um so that the current density is not exceeded.

Reply
  • Tom Volden

    Current density in A/m^2 is area based, while A/m is width based.  When laying out ICs the height of a metal layer is fixed for a give metal based on the process so it is more efficient to specify current density as width based since width is the only degree of freedom that a designer has. If a metal in a hypothetical process has a current density of 0.1mA/um and you know that there is 0.25 mA going through a branch you need to have the line width at least 2.5um so that the current density is not exceeded.

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