Zener Diode - LT Spice

benjamin.grant.du said:

Hi all,
i'd like to create a zener diode with Vthr = 420 mV, Is = 4uA
and I(zener) = Is*(exp(V(zener)/Vth)-1)... i can't figure out how to do anything like this. I created a custom current soure that I thought obeyed these properties but it seems to output current constantly so that can't be right. Any thoughts on how to approach this?
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benjamin.grant.du said:

Sorry, I guess I wasn't clear as to what behavior I needed. I essentially have two zener diodes facing opposite direction with different Is and Vs specs, in parallel with a capacitor and essentially a voltage source... However, Is is dependent on the voltage across the zener diode at any given point. That is, I can't just assign a voltage. I guess I can assign Is as an equation instead of the constant that you assigned it to? Attached is the actual problem i'm attempting to solve.

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benjamin.grant.du said:

Sorry, this one should make things clearer. The fact that the current is in units current density isn't significant, it simply mean the resulting voltage is in terms of voltage density, so it's not relevant to the modelling of this circuit.

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