Geoffrey_Coram
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With flkmod=1, as ACWWong wrote, you get the gm-based model, which has a spectral density in Amps/Hz^2 of KF * gm*gm / (Cox * W *L * f^AF)
Note the pre-factor of KF, which needs to be set. If you set flkmod=1 and get flicker noise, then KF must be set, because it defaults to zero. But this conflicts with your statement that "the model has no flicker noise" before you changed flkmod.
You may also want to look at the value of NOIMOD; if it is set to 2 or 3, then the model uses the "unified flicker noise model" with parameters NOIA, NOIB, NOIC (and the parameter KF has no effect). I don't recall offhand whether NOIMOD takes precedence over FLKMOD.
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