Hello,
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 parameters.
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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