diff --git a/src/xspice/icm/digital/d_pwm/cfunc.mod b/src/xspice/icm/digital/d_pwm/cfunc.mod
index af6e323c8..e64d6efcd 100644
--- a/src/xspice/icm/digital/d_pwm/cfunc.mod
+++ b/src/xspice/icm/digital/d_pwm/cfunc.mod
@@ -19,7 +19,7 @@ MODIFICATIONS
 
     23 Aug 1991    Jeffrey P. Murray
     30 Sep 1991    Jeffrey P. Murray
-
+    06 Oct 2022    Holger Vogt
 
 SUMMARY
 
@@ -69,7 +69,10 @@ NON-STANDARD FEATURES
 
 /*=== LOCAL VARIABLES & TYPEDEFS =======*/
 
-
+typedef struct {
+    double *x;
+    double *y;
+} Local_Data_t;
 
 
 /*=== FUNCTION PROTOTYPE DEFINITIONS ===*/
@@ -120,6 +123,27 @@ NON-STANDARD FEATURES
 
 ==============================================================================*/
 
+static void cm_d_pwm_callback(ARGS,
+        Mif_Callback_Reason_t reason)
+{
+    switch (reason) {
+        case MIF_CB_DESTROY: {
+            Local_Data_t *loc = STATIC_VAR(locdata);
+            if (loc) {
+                if (loc->x)
+                    free(loc->x);
+                if(loc->y)
+                    free(loc->y);
+                free(loc);
+                STATIC_VAR(locdata) = loc = NULL;
+            }
+            break;
+        } /* end of case MIF_CB_DESTROY */
+    } /* end of switch over reason being called */
+} /* end of function cm_d_pwm_callback */
+
+
+
 /*=== CM_D_PWM ROUTINE ===*/
 
 /*************************************************************
@@ -179,15 +203,12 @@ void cm_d_pwm(ARGS)
                   slope;    /* slope value...used to extrapolate
                                freq values past endpoints.  */
 
-
     int               i,    /* generic loop counter index */
               cntl_size,    /* control array size         */
               dc_size;      /* duty cycle array size       */
 
-
-
-
-
+    Local_Data_t *loc;        /* Pointer to local static data, not to be included
+                                       in the state vector (save memory!) */
 
     /**** Retrieve frequently used parameters... ****/
 
@@ -195,7 +216,6 @@ void cm_d_pwm(ARGS)
     dc_size = PARAM_SIZE(dc_array);
     frequency = PARAM(frequency);
 
-
     /* check and make sure that the control array is the
        same size as the frequency array */
 
@@ -204,10 +224,8 @@ void cm_d_pwm(ARGS)
         return;
     }
 
-
     if (INIT) {  /*** Test for INIT == TRUE. If so, allocate storage, etc. ***/
 
-
         /* Allocate storage for internal variables */
         cm_analog_alloc(0, sizeof(double));
         cm_analog_alloc(1, sizeof(double));
@@ -220,15 +238,35 @@ void cm_d_pwm(ARGS)
 
         t3 = (double *) cm_analog_get_ptr(2,0);
 
+        /*** allocate static storage for *loc ***/
+        STATIC_VAR (locdata) = calloc (1 , sizeof ( Local_Data_t ));
+        loc = STATIC_VAR (locdata);
+        CALLBACK = cm_d_pwm_callback;
+
+        x = loc->x = (double *) calloc((size_t) cntl_size, sizeof(double));
+        if (!x) {
+            cm_message_send(d_pwm_allocation_error);
+            return;
+        }
+        y = loc->y = (double *) calloc((size_t) cntl_size, sizeof(double));
+        if (!y) {
+            cm_message_send(d_pwm_allocation_error);
+            if(x)
+                free(x);
+            return;
+        }
+        /* Retrieve x and y values. */
+        for (i=0; i<cntl_size; i++) {
+            x[i] = PARAM(cntl_array[i]);
+            y[i] = PARAM(dc_array[i]);
+        }
     }
 
     else {    /*** This is not an initialization pass...retrieve storage
                    addresses and calculate new outputs, if required. ***/
 
-
         /** Retrieve previous values... **/
 
-
         /* assign internal variables */
         phase = (double *) cm_analog_get_ptr(0,0);
         phase_old = (double *) cm_analog_get_ptr(0,1);
@@ -239,9 +277,6 @@ void cm_d_pwm(ARGS)
 
     }
 
-
-
-
     switch (CALL_TYPE) {
 
     case ANALOG:    /** analog call **/
@@ -250,9 +285,7 @@ void cm_d_pwm(ARGS)
 
         if ( AC == ANALYSIS ) { /* this model does not function
                                    in AC analysis mode.         */
-
             return;
-
         }
         else {
 
@@ -265,38 +298,17 @@ void cm_d_pwm(ARGS)
                 }
                 *phase = *phase / 360.0;
 
-
                 /* set phase value to init_phase */
                 *phase_old = *phase;
 
                 /* preset time values to harmless values... */
                 *t1 = -1;
                 *t3 = -1;
-
-
             }
 
-
-            /* Allocate storage for breakpoint domain & duty cycle range values */
-
-            x = (double *) calloc((size_t) cntl_size, sizeof(double));
-            if (!x) {
-                cm_message_send(d_pwm_allocation_error);
-                return;
-            }
-
-            y = (double *) calloc((size_t) dc_size, sizeof(double));
-            if (!y) {
-                cm_message_send(d_pwm_allocation_error);
-                if(x) free(x);
-                return;
-            }
-
-            /* Retrieve x and y values. */
-            for (i=0; i<cntl_size; i++) {
-                x[i] = PARAM(cntl_array[i]);
-                y[i] = PARAM(dc_array[i]);
-            }
+            loc = STATIC_VAR (locdata);
+            x = loc->x;
+            y = loc->y;
 
             /* Retrieve cntl_input value. */
             cntl_input = INPUT(cntl_in);
@@ -346,7 +358,6 @@ void cm_d_pwm(ARGS)
 //                cm_message_send(d_pwm_positive_dc_error);
             }
 
-
             /* calculate the instantaneous phase */
             *phase = *phase_old + frequency * (TIME - T(1));
 
@@ -354,7 +365,6 @@ void cm_d_pwm(ARGS)
                the period */
             dphase = *phase_old - floor(*phase_old);
 
-
             /* Calculate the time variables and the output value
                for this iteration */
 
@@ -365,8 +375,6 @@ void cm_d_pwm(ARGS)
                 if(TIME < *t3) {
                     cm_event_queue(*t3);
                 }
-
-
             }
             else
 
@@ -380,7 +388,6 @@ void cm_d_pwm(ARGS)
                 if(TIME < *t1) {
 
                     cm_event_queue(*t1);
-
                 }
             }
             else {
@@ -395,23 +402,12 @@ void cm_d_pwm(ARGS)
                 }
 
                 *t3 = T(1) + (1 - dphase)/frequency;
-
-
             }
-
-
-
-            if(x) free(x);
-            if(y) free(y);
-
-
         }
         break;
 
-
     case EVENT:    /** discrete call...lots to do **/
 
-
         test_double = TIME;
 
         if ( 0.0 == TIME ) { /* DC analysis...preset values,
@@ -424,7 +420,6 @@ void cm_d_pwm(ARGS)
             }
             *phase = *phase / 360.0;
 
-
             /* set phase value to init_phase */
             *phase_old = *phase;
 
@@ -433,16 +428,12 @@ void cm_d_pwm(ARGS)
             *t3 = -1;
         }
 
-
-
         /* Calculate the time variables and the output value
            for this iteration */
 
         /* Output is always set to STRONG */
         OUTPUT_STRENGTH(out) = STRONG;
 
-
-
         if( *t1 == TIME ) { /* rising edge */
 
             OUTPUT_STATE(out) = ONE;
@@ -471,9 +462,7 @@ void cm_d_pwm(ARGS)
                 }
             }
         }
-
         break;
-
     }
 }
 
diff --git a/src/xspice/icm/digital/d_pwm/ifspec.ifs b/src/xspice/icm/digital/d_pwm/ifspec.ifs
index da6ed4da3..cde238f16 100644
--- a/src/xspice/icm/digital/d_pwm/ifspec.ifs
+++ b/src/xspice/icm/digital/d_pwm/ifspec.ifs
@@ -75,3 +75,9 @@ Vector:              no                      no
 Vector_Bounds:       -                       -
 Null_Allowed:       yes                     yes 
 
+
+STATIC_VAR_TABLE:
+
+Static_Var_Name:    locdata
+Description:        "local static data"
+Data_Type:          pointer