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Does u0 and vth0 viewed in simulation result reflect default constant value or the ones already considering any Layout-dependent effects in such environment: tsmc65nm, BISM4.5 model, Spectre7.2 ?

Alex Liao

After any Spectre simulation, does U0 in model parameter field mean the low-field mobility of the very original one or the one infulenced by STI/WPE or any other issues? Simply put, [url=http://postimg.org/image/l2oe8rrvh/][img]s6.postimg.org/.../url],

This image gives the equation of u0 under STI's influence. Is the u0 in ADE Result => Print Model Parameter list reflecting U0ref (may be a constant) or U0(already consider STI influence). If the case is the former (the initial constant) and then U0( influenced by STI) is invisiable to user; if it is the latter(influenced by STI) and then U0(the initial constant) is invisiable.  How about the vth0? Does the simulation result reflect final vth0 considering any layout or other issues or only give default value which is used to compute effecitive vth0 via inner equation?

 

Regards,

Alex 

Parents

  • Hi Berndfi,

     I have reviewed the pdf file. From what I learned from this file, it seems the Cadence Assura activate the calculation of STI indicator, i.e., the result of SA,SB/SAref,SBref. However, in Virtuoso I can still measure that dimension. The STI impact is like this:

    Layout Geometry => SA/SB (reflective) => mobility/velocity/Vth (physical/electrical root reason) => Performance (gain/bandwidth/phase margin) observed after simulation. The only invisiable part seems to be the root reason part. Model parameters are there without any consideration of STI. But effecitive mobility/velocity/Vth does consider STI effect because this is recorded in manual or the pdf file you provide. Are those effecitive mobility/velocity/Vth  observerable or user-editable in Cadence environment or any other ADE tools?

    Regards,

    Alex 

Reply

  • Hi Berndfi,

     I have reviewed the pdf file. From what I learned from this file, it seems the Cadence Assura activate the calculation of STI indicator, i.e., the result of SA,SB/SAref,SBref. However, in Virtuoso I can still measure that dimension. The STI impact is like this:

    Layout Geometry => SA/SB (reflective) => mobility/velocity/Vth (physical/electrical root reason) => Performance (gain/bandwidth/phase margin) observed after simulation. The only invisiable part seems to be the root reason part. Model parameters are there without any consideration of STI. But effecitive mobility/velocity/Vth does consider STI effect because this is recorded in manual or the pdf file you provide. Are those effecitive mobility/velocity/Vth  observerable or user-editable in Cadence environment or any other ADE tools?

    Regards,

    Alex 

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