diff --git a/src/xspice/icm/GNUmakefile.in b/src/xspice/icm/GNUmakefile.in
index a72cb488c..fe4494f85 100644
--- a/src/xspice/icm/GNUmakefile.in
+++ b/src/xspice/icm/GNUmakefile.in
@@ -7,7 +7,7 @@ include makedefs
 
 
 # The codemodels to make
-CMDIRS = spice2poly digital analog xtradev xtraevt
+CMDIRS = spice2poly digital analog xtradev xtraevt sherlockmbv
 
 
 all:
diff --git a/src/xspice/icm/sherlockmbv/.gitignore b/src/xspice/icm/sherlockmbv/.gitignore
new file mode 100644
index 000000000..27b44acbe
--- /dev/null
+++ b/src/xspice/icm/sherlockmbv/.gitignore
@@ -0,0 +1,12 @@
+/spice2poly.cm
+
+/cmextrn.h
+/cminfo.h
+/dlmain.c
+/objects.inc
+/udnextrn.h
+/udninfo.h
+
+/*/*.c
+
+!/*/udnfunc.c
diff --git a/src/xspice/icm/sherlockmbv/limitsmbv/cfunc.mod b/src/xspice/icm/sherlockmbv/limitsmbv/cfunc.mod
new file mode 100644
index 000000000..18d6d9a72
--- /dev/null
+++ b/src/xspice/icm/sherlockmbv/limitsmbv/cfunc.mod
@@ -0,0 +1,94 @@
+#include <math.h>
+void cm_limitsmbv(ARGS)  /* structure holding parms,
+                                       inputs, outputs, etc.     */
+{
+
+    double x;			/* Input Variable */
+    double xtp;			/* Transition threshold from linear to exponention (positive side) */
+    double xtm;			/* Transition threshold from linear to exponention (positive side) */
+
+    double y;			/* Output Variable */
+
+    double xtpi;		/* xtp limited to positive range */
+    double xtmi;		/* xtm limited to negative range */
+
+    double g;			/* Linear slope passing through x,y=0,0 */
+    double a;			/* Term for exponetial regions below xtm and above xtp */
+    double Xg;			/* Relation for continuous derivatives at xtm and xtp */
+    double Xo;			/* Offset of exponentional terms for continuos derivatives */
+
+    Mif_Complex_t dy_dx;	/* Complex partial derivative dy/dx */
+    Mif_Complex_t dy_dxtp;	/* Complex partial derivative dy/dxtp */
+    Mif_Complex_t dy_dxtm;	/* Complex partial derivative dy/dxtm */
+
+
+   /*
+    * Linear to Exponention Transistion Management
+    */
+    g =			PARAM(g);
+    a =			PARAM(a);
+    if ( g > 0.0 ) {
+      Xg =		log( g / a ) / a;
+      Xo =		exp( a * Xg );
+    }
+    else {
+      Xg =		0.0;
+      Xo =		1.0;
+    }
+
+   /*
+    * Access the inputs from the interface
+    */
+    x =			INPUT(x);
+    xtp =		INPUT(xtp);
+    xtm =		INPUT(xtm);
+
+
+   /*
+    * Sanity check on dynamic thresholds.
+    */
+    xtpi =		(xtp >= 0.0) ? xtp : 0.0;
+    xtmi =		(xtm <= 0.0) ? xtm : 0.0;
+
+   /*
+    * Ideal Avalanche Characteristic
+    */
+    if (x >= xtpi) {
+      y			= g * xtpi+exp(a * (x - xtpi+Xg)) - Xo;
+      dy_dx.real	= a*exp(a * (x - xtpi+Xg));
+      dy_dxtp.real	= g - a*exp(a * (x - xtpi+Xg));
+      dy_dxtm.real	= 0.0;
+    }
+    else if (x <= xtmi) {
+      y			= -1.0 * (g * fabs(xtmi)+exp(a * (fabs(x) - fabs(xtmi)+Xg)) - Xo);
+      dy_dx.real	= -1.0*a*exp(a * (fabs(x) - fabs(xtmi)+Xg));;
+      dy_dxtp.real	= 0.0;
+      dy_dxtm.real	= -1.0*(g - a*exp(a * (fabs(x) - fabs(xtmi)+Xg)));
+    }
+    else {
+      y			= g * x;
+      dy_dx.real	= g;
+      dy_dxtp.real	= 0.0;
+      dy_dxtm.real	= 0.0;
+    }
+
+   /*
+    * Zero out the imaginary parts.
+    */
+    dy_dx.imag		= 0.0;
+    dy_dxtp.imag	= 0.0;
+    dy_dxtm.imag	= 0.0;
+
+
+    if (ANALYSIS != MIF_AC) {		/* DC & Transient Analyses */
+      OUTPUT(y) =	y;
+      PARTIAL(y,x) =	dy_dx.real;
+      PARTIAL(y,xtp) =	dy_dxtp.real;
+      PARTIAL(y,xtm) =	dy_dxtm.real;
+    }
+    else {				/* AC Analysis */
+      AC_GAIN(y,x) =	dy_dx;
+      AC_GAIN(y,xtp) =	dy_dxtp;
+      AC_GAIN(y,xtm) =	dy_dxtm;
+    }
+}
diff --git a/src/xspice/icm/sherlockmbv/limitsmbv/ifspec.ifs b/src/xspice/icm/sherlockmbv/limitsmbv/ifspec.ifs
new file mode 100644
index 000000000..d76c3941b
--- /dev/null
+++ b/src/xspice/icm/sherlockmbv/limitsmbv/ifspec.ifs
@@ -0,0 +1,74 @@
+/*
+ * SUMMARY
+ * This file contains the interface specification file for the
+ * analog limit code model.
+ *
+ */
+
+NAME_TABLE:
+
+
+C_Function_Name:       cm_limitsmbv
+Spice_Model_Name:      limitsmbv
+Description:           "limit block"
+
+
+PORT_TABLE:
+Port_Name:          x
+Description:        "input"
+Direction:          in
+Default_Type:       v
+Allowed_Types:      [v,vd,i,id,vnam]
+Vector:             no
+Vector_Bounds:      -
+Null_Allowed:       no
+
+PORT_TABLE:
+Port_Name:          xtp
+Description:        "positive threshold"
+Direction:          in
+Default_Type:       v
+Allowed_Types:      [v,vd,i,id,vnam]
+Vector:             no
+Vector_Bounds:      -
+Null_Allowed:       no
+
+PORT_TABLE:
+Port_Name:          xtm
+Description:        "negative threshold"
+Direction:          in
+Default_Type:       v
+Allowed_Types:      [v,vd,i,id,vnam]
+Vector:             no
+Vector_Bounds:      -
+Null_Allowed:       no
+
+PORT_TABLE:
+Port_Name:          y
+Description:        "output"
+Direction:          out
+Default_Type:       v
+Allowed_Types:      [v,vd,i,id]
+Vector:             no
+Vector_Bounds:      -
+Null_Allowed:       no
+
+PARAMETER_TABLE:
+Parameter_Name:     g
+Description:        "linear gain"
+Data_Type:          real
+Default_Value:      1.0
+Limits:             -
+Vector:              no
+Vector_Bounds:       -
+Null_Allowed:       yes
+
+PARAMETER_TABLE:
+Parameter_Name:     a
+Description:        "exponential gain"
+Data_Type:          real
+Default_Value:      1.0
+Limits:             -
+Vector:              no
+Vector_Bounds:       -
+Null_Allowed:       yes
diff --git a/src/xspice/icm/sherlockmbv/modpath.lst b/src/xspice/icm/sherlockmbv/modpath.lst
new file mode 100644
index 000000000..83b31b70c
--- /dev/null
+++ b/src/xspice/icm/sherlockmbv/modpath.lst
@@ -0,0 +1 @@
+limitsmbv
diff --git a/src/xspice/icm/sherlockmbv/udnpath.lst b/src/xspice/icm/sherlockmbv/udnpath.lst
new file mode 100644
index 000000000..e69de29bb