Is there a generic simulation model for the zener diode? I am not seeing it in the “Simulation_SPICE” library. I’m using v7.0.0 release build.
I have a circuit I am designing. I just need a generic zener with definable reverse voltage. The details are not important at this point. Once I see how the circuit behaves I’ll be able to select the specific components.
There is no Zener-Diode model in Simulation_SPICE.
You may use the generic diode D and modify 2 parameters: BV (reverse breakdown voltage) and IBV (current at breakdown). Example parameters for a 5 V-Zener are:
Symbol Properties (Double-Click on D) → Simulation Model… → Parameters → DC → bv value: 5, ibv value: 0.001.
See example attached (done with 7.0.2)
Zener.7z (3.8 KB)
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Thanks! That makes a lot of sense. I was thinking the zener would need a different model, but it seems the device physics is all there. It’s just a matter of setting the parameters.
As a follow up question. The NMOS FET model is enhancement mode (VTO=0). To make that depletion mode is it as simple as setting VTO <0? e.g. VTO = -2V. I can confirm this “works”, but I am not experienced enough to know if there are additional parameters that need to be changed.
I am making a current source with a FET and a resistor, that requires the negative feedback that comes with working at Vgs<0.