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Equivalent diode model parameter to ADS's "Imax" and "Ikf(Ik)" diode parameters?

Art254
Hi Everyone,

I am transferring a diode model from ADS to Cadence. In it's ADS model, there is Imax and Ikf, I wonder what's the equivalent model parameters used in Cadence's diode in Analoglib? Please let me know.

In ADS, Imax= explosion current beyond which diode junction current is linearized. Ikf(Ik)= high-injection knee current.

Thank you very much.
Parents

  • Hi Tawna,

     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.

     Jimmy 

Reply

  • Hi Tawna,

     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.

     Jimmy 

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