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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

  • 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.

  • rafaelon

    Hi Tom Volden,

    Thanks for the explanation. Please, I would like one more help. I was reading the Power IR/EM User Guide and it references the following manual:

    QRC Techgen Reference Manual. Please, could you send me this manual or give me a link to download?

    In page 119 we have the information: "Power IR/EM has its own methodology to perform average, peak, and RMS analyses". Could you send a file explaning the equations and more descriptions of this methodology.

    Regards,


    Rafael

  • Tom Volden
    All of the manuals are available at support.cadence.com and should be available in your software installation as well. The latest version of the manual you referenced is at http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:TechPubDocs;src=pubs;q=/extTechgen/extTechgen15.12/extTechgenTOC.html
  • rafaelon
    Hi Tom,

    Thanks for information. For access these files, a registration is required.
    When I try to register a new account, I use my Host ID. After this, I receive the following message: "Registration cannot continue. University users cannot register themselves. Please contact Customer Support for registration assistance." How could I create a account and acess these files?

    Best Regards,
    Rafael
  • Tom Volden

    Hi Rafael,

    I'm not sure about the process for University users to get access to the customer support website.  However, you should be able to access the manuals directly from the tool installation.  You can do this by starting "cdnshelp".  If it does not already have the manual available in the list of products, you can open the library file by selecting File->Open->Library and browsing to <install_path>/doc/xmlreg/library.lbr.

    Regards,

    TOM

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