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How to make an ideal diode model for diode from analogLib?

BaaB

I am trying to make a model and use it for ideal diode from analogLib library. However, I don't know how to modify the built-in potential (or forward voltage) of the diode. I tried to add VJ variable and set it to a small value like 0.1V. However, from I-V characteristic of simulation, it doesn't seem to have any effect on forward voltage at all. The built-in potential from the simulation is about 650mV. 

Can anybody tell me how to do that? I want the diode is like ideal (zero forward voltage and infinite slope).

Here is the model file I used (diode.scs):

simulator lang=spice

.model schottky D (LEVEL = 3 IS=1p RS=0 BV=40.0 IBV=1p VJ=0.1 CJO=0 M=0.5 N=1 TT=0 )


Parents

  • Thank you, Andrew Beckett! You are right I tried some ideal components before and faced convergence problem. For the diode, I don't need it to be perfectly idea but something close to that. However, as in the picture above, the forward voltage is too large and the slope is not that steep.

    I am trying to follow your method but I get stuck. You helped me with one similar example before as here.  This example is a bit different to me. 
    I created a model file named idealDiode.scs with content: 

    subckt idealDiode (a c)
    // note, the on resistance shouldn't be below 1mOhm
    D1 (a c a c) relay rclosed=1m vt1=0.0 vt2=1m

    Then created a diode symbol with two pins a, c and name as "idealDiode". And then do the all the things as the given link above. 
    however, where should I put this line "Dideal (n1 n2) idealDiode"?


Reply

  • Thank you, Andrew Beckett! You are right I tried some ideal components before and faced convergence problem. For the diode, I don't need it to be perfectly idea but something close to that. However, as in the picture above, the forward voltage is too large and the slope is not that steep.

    I am trying to follow your method but I get stuck. You helped me with one similar example before as here.  This example is a bit different to me. 
    I created a model file named idealDiode.scs with content: 

    subckt idealDiode (a c)
    // note, the on resistance shouldn't be below 1mOhm
    D1 (a c a c) relay rclosed=1m vt1=0.0 vt2=1m

    Then created a diode symbol with two pins a, c and name as "idealDiode". And then do the all the things as the given link above. 
    however, where should I put this line "Dideal (n1 n2) idealDiode"?


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