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hSPICE and gm

Discussion in 'Electronic Design' started by [email protected], Jul 31, 2005.

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  1. Guest


    I recently wanted to find out what the gm of my transistors were when
    doing simulations. Searching the web, I found that this parameter was
    called LX7 and gds is LX8. Does anyone know how this came about? I
    don't understand the how LX and a number are linked to a transistors
  2. Steve

    Steve Guest

    Hmmm. I thought they'd fixed this. Anyway, this comes from the SPICE2
    basis of HSPICE. SPICE2 had a rather clever fortran memory manager
    long before fortran could malloc memory. The memory was handled by
    offsets from a base address, sort of like structures. The LX table
    for each device was used to store derivatives and operating point
    info. So, anyway, there is no real correlation between LX offsets and
    the parameters stored there, other than that was how the LX table was
    set up. But for user output, using the LX offsets for these instead
    of names was very ugly.
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