From 4f9fb4c641a35cc10360cd722ca34b4b08420cf5 Mon Sep 17 00:00:00 2001
From: dwarning <dietmar.warning@gmail.com>
Date: Thu, 11 Dec 2025 10:43:07 +0100
Subject: [PATCH] Diode model level=2 (Fowler-Nordheim) is not supported.

---
 src/spicelib/devices/dio/diosetup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/spicelib/devices/dio/diosetup.c b/src/spicelib/devices/dio/diosetup.c
index 0b40b1b49..df9555be8 100644
--- a/src/spicelib/devices/dio/diosetup.c
+++ b/src/spicelib/devices/dio/diosetup.c
@@ -35,6 +35,10 @@ DIOsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt, int *states)
 
         if(!model->DIOlevelGiven) {
             model->DIOlevel = 1;
+        } else if (model->DIOlevel == 2) {
+            SPfrontEnd->IFerrorf(ERR_FATAL,
+                "%s: Diode model level 2 is not supported.", model->DIOmodName);
+            return(E_BADPARM);
         }
         if(!model->DIOemissionCoeffGiven) {
             model->DIOemissionCoeff = 1;