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You will want to look at the Spectre manuals for information on the diod model parameter. For ADS model information, I suggest contacting Agilent.
Here is a link to the Spectre manual: (note: you must login to Cadence On Line Support to view this.)
Customer Support Director - Analog/Mixed-Signal/RF AEs
Cadence Design Systems, Inc.
In reply to Tawna:
In reply to Art254:
In the spectre manual that I referenced earlier:
imelt and imax are used on devices containing
p-n junctions. These devices include .... diodes....
imax is a warning control parameter. Normally, imax
does not affect the simulation results. Whenever the junction current
is larger than imax, the Spectre circuit simulator issues a
warning. The default value of imax is 1A, and
the default value of imelt is imax.
Therefore, imax can affect the simulation results only when
imelt is not specified and takes its value from imax.
I cannot comment on Agilent's model, as I do not support their simulator. You may want to put in a call to Cadence Customer Support (support.cadence.com) if you cannot find the information that you require in the Cadence Spectre Modeling Guide manual.
In reply to Andrew Beckett:
You mentioned that in spectre that
imax is a warning control parameter. Normally, imax does not affect the simulation results. Whenever the junction current is larger than imax, the Spectre circuit simulator issues a warning. The default value of imax is 1A, and the default value of imelt is imax. Therefore, imax can affect the simulation results only when imelt is not specified and takes its value from imax.
However, my test case shows that when IMELT is defined, IMAX still affects simulation result. In my test case with IMELT=5, as IMAX is increased from 200, 2000, 20000, the diode reverse recovery current is increased from 1.7A, 2.3A and 3.6A respectively. There must be some undocumented relationship between IMAX and simulated diode current even when IMELT is specified.