how to calculate output res based on simulated op point?

Discussion in 'Cadence' started by nus_lin, Apr 12, 2005.

  1. nus_lin

    nus_lin Guest

    dear guys,

    how to calculate the output resistance based on the saved op point? i
    found that in spectre, the "ron" shown in the table of op point did
    not equal to gain/gm. it is so weired. how is this ron defined in
    bsim3v3 model?
     
    nus_lin, Apr 12, 2005
    #1
  2. nus_lin

    Kuan Zhou Guest

    Hi,

    Here is the answer. I asked the similar question last week.

    Ron is defined as Vds/Ids. So if you look at the op point, Vds/Ids is
    exactly the Ron value shown in the list.

    The short channel effect resistance is 1/gds for each transistor. The
    short channel effect is defined as 1/r0=d(Ids)/d(Vds)


    Kuan
     
    Kuan Zhou, Apr 12, 2005
    #2
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