This isn't really related to the earlier post, and anyway the forum guidelines ask you not to post on the end of old posts. Please read the guidelines ! The parameters kf and af correspond to the normal flicker noise coefficient and exponent in flicker noise models (see the documentation for the normal diode model in spectre. You'd also see these in SPICE models for diodes which include flicker noise. The ef parameter is the exponent of 1/f (so if at the default value of 1, it means conventional flicker noise, if 2 it would be 1/f**2). Andrew.
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