diff --git a/compiler/characterizer/stimuli.py b/compiler/characterizer/stimuli.py
index 58a9e3ed..fc2a106f 100644
--- a/compiler/characterizer/stimuli.py
+++ b/compiler/characterizer/stimuli.py
@@ -34,6 +34,10 @@ class stimuli():
         self.sf = stim_file
         
         (self.process, self.voltage, self.temperature) = corner
+        try:
+            self.device_libraries = tech.spice["fet_libraries"][self.process]
+        except:
+            debug.info(2, "Not using spice library")
         self.device_models = tech.spice["fet_models"][self.process]
     
         self.sram_name = "Xsram"
@@ -247,8 +251,15 @@ class stimuli():
 
     def write_include(self, circuit):
         """Writes include statements, inputs are lists of model files"""
+        libraries = self.device_libraries
         includes = self.device_models + [circuit]
         self.sf.write("* {} process corner\n".format(self.process))
+        for item in list(libraries):
+            if os.path.isfile(item[0]):
+                self.sf.write(".lib \"{0}\" {1}\n".format(item[0], item[1]))
+            else:
+                debug.error("Could not find spice library: {0}\nSet SPICE_MODEL_DIR to over-ride path.\n".format(item[0]))
+
         for item in list(includes):
             if os.path.isfile(item):
                 self.sf.write(".include \"{0}\"\n".format(item))
diff --git a/compiler/pgates/pgate.py b/compiler/pgates/pgate.py
index d83825ea..ba5fef75 100644
--- a/compiler/pgates/pgate.py
+++ b/compiler/pgates/pgate.py
@@ -8,10 +8,14 @@
 import contact
 import design
 import debug
-from tech import layer
+import math
+from bisect import bisect_left
+from tech import layer, drc
 from vector import vector
 from globals import OPTS
 
+if(OPTS.tech_name == "s8"):
+    from tech import nmos_bins, pmos_bins
 
 class pgate(design.design):
     """
@@ -282,5 +286,48 @@ class pgate(design.design):
         self.width = max(self.nwell_contact.rx(), self.pwell_contact.rx()) + self.m1_space + 0.5 * contact.m1_via.width
         self.well_width = self.width + 2 * self.nwell_enclose_active
         # Height is an input parameter, so it is not recomputed.
+    
+    def bin_width(self, tx_type, target_width):
+
+        if tx_type == "nmos":
+            bins = nmos_bins[drc("minwidth_poly")]
+        elif tx_type == "pmos":
+            bins = pmos_bins[drc("minwidth_poly")]
+        else:
+            debug.error("invalid tx type")
+        
+        
+        bins = bins[0:bisect_left(bins, target_width) + 1]
+        if len(bins) == 1:
+            selected_bin = bins[0]
+            scaling_factor = 1
+            scaled_bin = bins[0]
+            
+        else:
+            scaled_bins = []
+            scaling_factors = []
+            for width in bins[0:-1]:
+                m = math.ceil(target_width / width)
+                scaling_factors.append(m)
+                scaled_bins.append(m * width)
+
+            scaled_bins.append(bins[-1])
+            scaling_factors.append(1)
+            select = bisect_left(scaled_bins, target_width)
+
+            selected_bin = bins[select]
+            scaling_factor = scaling_factors[select]
+            scaled_bin = scaled_bins[select]
+
+        debug.info(2, "binning {0} tx, target: {4}, found {1} x {2} = {3}".format(tx_type, selected_bin, scaling_factor, scaled_bin, target_width))
+
+        return(selected_bin, scaling_factor)
+
+
+
+
+            
+        
+
 
         
diff --git a/compiler/pgates/pinv.py b/compiler/pgates/pinv.py
index 3c2e41a2..1ccad6ca 100644
--- a/compiler/pgates/pinv.py
+++ b/compiler/pgates/pinv.py
@@ -81,6 +81,9 @@ class pinv(pgate.pgate):
             self.tx_mults = 1
             self.nmos_width = self.nmos_size * drc("minwidth_tx")
             self.pmos_width = self.pmos_size * drc("minwidth_tx")
+            if OPTS.tech_name == "s8":
+                (self.nmos_width, self.tx_mults) = self.bin_width("nmos", self.nmos_width)
+                (self.pmos_width, self.tx_mults) = self.bin_width("pmos", self.pmos_width)
             return
         
         # Do a quick sanity check and bail if unlikely feasible height
diff --git a/compiler/pgates/precharge.py b/compiler/pgates/precharge.py
index afe14a05..45128421 100644
--- a/compiler/pgates/precharge.py
+++ b/compiler/pgates/precharge.py
@@ -8,6 +8,7 @@
 import contact
 import design
 import debug
+from pgate import pgate
 from tech import parameter
 from vector import vector
 from globals import OPTS
@@ -28,6 +29,7 @@ class precharge(design.design):
         self.bitcell = factory.create(module_type="bitcell")
         self.beta = parameter["beta"]
         self.ptx_width = self.beta * parameter["min_tx_size"]
+        self.ptx_mults = 1
         self.width = self.bitcell.width
         self.bitcell_bl = bitcell_bl
         self.bitcell_br = bitcell_br
@@ -77,8 +79,11 @@ class precharge(design.design):
         """
         Initializes the upper and lower pmos
         """
+        if(OPTS.tech_name == "s8"):
+            (self.ptx_width, self.ptx_mults) = pgate.bin_width(self, "pmos", self.ptx_width)
         self.pmos = factory.create(module_type="ptx",
                                    width=self.ptx_width,
+                                   mults=self.ptx_mults,
                                    tx_type="pmos")
         self.add_mod(self.pmos)
 
diff --git a/compiler/pgates/ptx.py b/compiler/pgates/ptx.py
index 357e1ce4..ffd61a48 100644
--- a/compiler/pgates/ptx.py
+++ b/compiler/pgates/ptx.py
@@ -107,7 +107,9 @@ class ptx(design.design):
         # be decided in the layout later.
         area_sd = 2.5 * self.poly_width * self.tx_width
         perimeter_sd = 2 * self.poly_width + 2 * self.tx_width
-        if OPTS.tech_name == "s8":
+
+
+        if OPTS.tech_name == None:
             print("here {0}".format(self.name))
             # s8 technology is in microns
             main_str = "M{{0}} {{1}} {0} m={1} w={2} l={3} ".format(spice[self.tx_type],