diff --git a/compiler/base/hierarchy_spice.py b/compiler/base/hierarchy_spice.py
index 424e4d94..b5ccd19b 100644
--- a/compiler/base/hierarchy_spice.py
+++ b/compiler/base/hierarchy_spice.py
@@ -2,6 +2,7 @@ import debug
 import re
 import os
 import math
+import tech
 
 class spice():
     """
@@ -218,7 +219,7 @@ class spice():
         del usedMODS
         spfile.close()
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """Inform users undefined delay module while building new modules"""
         debug.warning("Design Class {0} delay function needs to be defined"
                       .format(self.__class__.__name__))
@@ -228,15 +229,21 @@ class spice():
         # return 0 to keep code running while building
         return delay_data(0.0, 0.0)
 
-    def cal_delay_with_rc(self, r, c ,slew, swing = 0.5):
+    def cal_delay_with_rc(self, corner, r, c ,slew, swing = 0.5):
         """ 
         Calculate the delay of a mosfet by 
         modeling it as a resistance driving a capacitance
         """
         swing_factor = abs(math.log(1-swing)) # time constant based on swing
+        proc,volt,temp = corner
+        #FIXME: type of delay is needed to know which process to use.
+        proc_mult = max(self.get_process_delay_factor(proc)) 
+        volt_mult = self.get_voltage_delay_factor(volt)
+        temp_mult = self.get_temp_delay_factor(temp)
         delay = swing_factor * r * c #c is in ff and delay is in fs
+        delay = delay * proc_mult * volt_mult * temp_mult
         delay = delay * 0.001 #make the unit to ps
-
+        
         # Output slew should be linear to input slew which is described 
         # as 0.005* slew.
 
@@ -247,6 +254,36 @@ class spice():
         slew = delay * 0.6 * 2 + 0.005 * slew
         return delay_data(delay = delay, slew = slew)
 
+    def get_process_delay_factor(self, proc):
+        """Returns delay increase estimate based off process
+           Currently does +/-10 for fast/slow corners."""
+        proc_factors = []
+        for mos_proc in proc:
+            if mos_proc == 'T':
+                proc_factors.append(1.0)
+            elif mos_proc == 'F':
+                proc_factors.append(0.9)
+            elif mos_proc == 'S':
+                proc_factors.append(1.1)  
+        return proc_factors
+        
+    def get_voltage_delay_factor(self, voltage):
+        """Returns delay increase due to voltage.
+           Implemented as linear factor based off nominal voltage.
+        """
+        return tech.spice['vdd_nominal']/voltage
+        
+    def get_temp_delay_factor(self, temp):
+        """Returns delay increase due to temperature (in C).
+           Determines effect on threshold voltage and then linear factor is estimated.
+        """
+        #Some portions of equation condensed (phi_t = k*T/q for T in Kelvin) in mV
+        #(k/q)/100 = .008625, The division 100 simplifies the conversion from C to K and mV to V
+        thermal_voltage_nom = .008625*tech.spice["temp_nominal"]
+        thermal_voltage = .008625*temp
+        vthresh = (tech.spice["v_threshold_typical"]+2*(thermal_voltage-thermal_voltage_nom))
+        #Calculate effect on Vdd-Vth. The current vdd is not used here. A separate vdd factor is calculated.
+        return (tech.spice['vdd_nominal'] - tech.spice["v_threshold_typical"])/(tech.spice['vdd_nominal']-vthresh)
 
     def return_delay(self, delay, slew):
         return delay_data(delay, slew)
diff --git a/compiler/bitcells/bitcell.py b/compiler/bitcells/bitcell.py
index 3c49a959..afa8ae1a 100644
--- a/compiler/bitcells/bitcell.py
+++ b/compiler/bitcells/bitcell.py
@@ -24,7 +24,7 @@ class bitcell(design.design):
         self.height = bitcell.height
         self.pin_map = bitcell.pin_map
         
-    def analytical_delay(self, slew, load=0, swing = 0.5):
+    def analytical_delay(self, corner, slew, load=0, swing = 0.5):
         # delay of bit cell is not like a driver(from WL)
         # so the slew used should be 0
         # it should not be slew dependent?
@@ -33,7 +33,7 @@ class bitcell(design.design):
         from tech import spice
         r = spice["min_tx_r"]*3
         c_para = spice["min_tx_drain_c"]
-        result = self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew, swing = swing)
+        result = self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew, swing = swing)
         return result
    
  
diff --git a/compiler/bitcells/bitcell_1rw_1r.py b/compiler/bitcells/bitcell_1rw_1r.py
index 79dc734c..30cf9144 100644
--- a/compiler/bitcells/bitcell_1rw_1r.py
+++ b/compiler/bitcells/bitcell_1rw_1r.py
@@ -24,7 +24,7 @@ class bitcell_1rw_1r(design.design):
         self.height = bitcell_1rw_1r.height
         self.pin_map = bitcell_1rw_1r.pin_map
 
-    def analytical_delay(self, slew, load=0, swing = 0.5):
+    def analytical_delay(self, corner, slew, load=0, swing = 0.5):
         # delay of bit cell is not like a driver(from WL)
         # so the slew used should be 0
         # it should not be slew dependent?
@@ -33,7 +33,7 @@ class bitcell_1rw_1r(design.design):
         from tech import spice
         r = spice["min_tx_r"]*3
         c_para = spice["min_tx_drain_c"]
-        result = self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew, swing = swing)
+        result = self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew, swing = swing)
         return result
    
  
diff --git a/compiler/bitcells/bitcell_1w_1r.py b/compiler/bitcells/bitcell_1w_1r.py
index 4df9e813..1283db76 100644
--- a/compiler/bitcells/bitcell_1w_1r.py
+++ b/compiler/bitcells/bitcell_1w_1r.py
@@ -24,7 +24,7 @@ class bitcell_1w_1r(design.design):
         self.height = bitcell_1w_1r.height
         self.pin_map = bitcell_1w_1r.pin_map
 
-    def analytical_delay(self, slew, load=0, swing = 0.5):
+    def analytical_delay(self, corner, slew, load=0, swing = 0.5):
         # delay of bit cell is not like a driver(from WL)
         # so the slew used should be 0
         # it should not be slew dependent?
@@ -33,7 +33,7 @@ class bitcell_1w_1r(design.design):
         from tech import spice
         r = spice["min_tx_r"]*3
         c_para = spice["min_tx_drain_c"]
-        result = self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew, swing = swing)
+        result = self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew, swing = swing)
         return result
    
  
diff --git a/compiler/bitcells/pbitcell.py b/compiler/bitcells/pbitcell.py
index b241471d..104a2b41 100644
--- a/compiler/bitcells/pbitcell.py
+++ b/compiler/bitcells/pbitcell.py
@@ -866,12 +866,12 @@ class pbitcell(design.design):
         vdd_pos = self.inverter_pmos_right.get_pin("D").center()
         self.add_path("metal1", [Q_bar_pos, vdd_pos])
 
-    def analytical_delay(self, slew, load=0, swing = 0.5):
+    def analytical_delay(self, corner, slew, load=0, swing = 0.5):
         #FIXME: Delay copied exactly over from bitcell
         from tech import spice
         r = spice["min_tx_r"]*3
         c_para = spice["min_tx_drain_c"]
-        result = self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew, swing = swing)
+        result = self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew, swing = swing)
         return result
         
     def analytical_power(self, proc, vdd, temp, load):
diff --git a/compiler/characterizer/delay.py b/compiler/characterizer/delay.py
index 7aa9641d..17ce8c4e 100644
--- a/compiler/characterizer/delay.py
+++ b/compiler/characterizer/delay.py
@@ -907,7 +907,7 @@ class delay(simulation):
         for slew in slews:
             for load in loads:
                 self.set_load_slew(load,slew)
-                bank_delay = self.sram.analytical_delay(self.vdd_voltage, self.slew,self.load)
+                bank_delay = self.sram.analytical_delay(self.corner, self.slew,self.load)
                 for port in self.all_ports:
                     for mname in self.delay_meas_names+self.power_meas_names:
                         if "power" in mname:
@@ -921,8 +921,9 @@ class delay(simulation):
         period_margin = 0.1
         risefall_delay = bank_delay[self.read_ports[0]].delay/1e3
         sram_data = { "min_period":risefall_delay*2*period_margin, 
-                      "leakage_power": power.leakage}                    
-         
+                      "leakage_power": power.leakage}
+        debug.info(2,"SRAM Data:\n{}".format(sram_data))                 
+        debug.info(2,"Port Data:\n{}".format(port_data)) 
         return (sram_data,port_data)
         
     
diff --git a/compiler/modules/bank.py b/compiler/modules/bank.py
index 5d4e9739..7eddc3bb 100644
--- a/compiler/modules/bank.py
+++ b/compiler/modules/bank.py
@@ -1216,26 +1216,30 @@ class bank(design.design):
                             rotate=90)
 
         
-    def analytical_delay(self, vdd, slew, load):
+    def analytical_delay(self, corner, slew, load):
         """ return  analytical delay of the bank"""
         results = []
         
-        decoder_delay = self.row_decoder.analytical_delay(slew, self.wordline_driver.input_load())
+        decoder_delay = self.row_decoder.analytical_delay(corner, slew, self.wordline_driver.input_load())
 
-        word_driver_delay = self.wordline_driver.analytical_delay(decoder_delay.slew, self.bitcell_array.input_load())
+        word_driver_delay = self.wordline_driver.analytical_delay(corner, 
+                                                                  decoder_delay.slew, 
+                                                                  self.bitcell_array.input_load())
 
         #FIXME: Array delay is the same for every port.
-        bitcell_array_delay = self.bitcell_array.analytical_delay(word_driver_delay.slew)
+        bitcell_array_delay = self.bitcell_array.analytical_delay(corner, word_driver_delay.slew)
 
         #This also essentially creates the same delay for each port. Good structure, no substance
         for port in self.all_ports:
             if self.words_per_row > 1:
-                column_mux_delay = self.column_mux_array[port].analytical_delay(vdd, bitcell_array_delay.slew,
-                                                                         self.sense_amp_array.input_load())
+                column_mux_delay = self.column_mux_array[port].analytical_delay(corner, 
+                                                                                bitcell_array_delay.slew,
+                                                                                self.sense_amp_array.input_load())
             else:
                 column_mux_delay = self.return_delay(delay = 0.0, slew=word_driver_delay.slew)
                 
-            bl_t_data_out_delay = self.sense_amp_array.analytical_delay(column_mux_delay.slew,
+            bl_t_data_out_delay = self.sense_amp_array.analytical_delay(corner, 
+                                                                        column_mux_delay.slew,
                                                                         self.bitcell_array.output_load())
             # output load of bitcell_array is set to be only small part of bl for sense amp.
             results.append(decoder_delay + word_driver_delay + bitcell_array_delay + column_mux_delay + bl_t_data_out_delay) 
diff --git a/compiler/modules/bitcell_array.py b/compiler/modules/bitcell_array.py
index 67e5a9da..9df5d696 100644
--- a/compiler/modules/bitcell_array.py
+++ b/compiler/modules/bitcell_array.py
@@ -130,7 +130,7 @@ class bitcell_array(design.design):
                         self.add_power_pin(pin_name, pin.center(), 0, pin.layer)
                             
 
-    def analytical_delay(self, slew, load=0):
+    def analytical_delay(self, corner, slew, load=0):
         from tech import drc
         wl_wire = self.gen_wl_wire()
         wl_wire.return_delay_over_wire(slew)
@@ -141,7 +141,7 @@ class bitcell_array(design.design):
         cell_load = 2 * bl_wire.return_input_cap() # we ingore the wire r
                                                    # hence just use the whole c
         bl_swing = 0.1
-        cell_delay = self.cell.analytical_delay(wl_to_cell_delay.slew, cell_load, swing = bl_swing)
+        cell_delay = self.cell.analytical_delay(corner, wl_to_cell_delay.slew, cell_load, swing = bl_swing)
 
         #we do not consider the delay over the wire for now
         return self.return_delay(cell_delay.delay+wl_to_cell_delay.delay,
diff --git a/compiler/modules/dff.py b/compiler/modules/dff.py
index 19077689..8cf02d40 100644
--- a/compiler/modules/dff.py
+++ b/compiler/modules/dff.py
@@ -39,7 +39,7 @@ class dff(design.design):
         transition_prob = spice["flop_transition_prob"]
         return transition_prob*(c_load + c_para) 
 
-    def analytical_delay(self, slew, load = 0.0):
+    def analytical_delay(self, corner, slew, load = 0.0):
         # dont know how to calculate this now, use constant in tech file
         result = self.return_delay(spice["dff_delay"], spice["dff_slew"])
         return result
diff --git a/compiler/modules/dff_array.py b/compiler/modules/dff_array.py
index 5d728205..9d11b811 100644
--- a/compiler/modules/dff_array.py
+++ b/compiler/modules/dff_array.py
@@ -154,8 +154,8 @@ class dff_array(design.design):
             
         
 
-    def analytical_delay(self, slew, load=0.0):
-        return self.dff.analytical_delay(slew=slew, load=load)
+    def analytical_delay(self, corner, slew, load=0.0):
+        return self.dff.analytical_delay(corner, slew=slew, load=load)
 
     def get_clk_cin(self):
         """Return the total capacitance (in relative units) that the clock is loaded by in the dff array"""
diff --git a/compiler/modules/dff_buf.py b/compiler/modules/dff_buf.py
index 42d37bd1..fa3285ba 100644
--- a/compiler/modules/dff_buf.py
+++ b/compiler/modules/dff_buf.py
@@ -172,11 +172,11 @@ class dff_buf(design.design):
         
         
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """ Calculate the analytical delay of DFF-> INV -> INV """
-        dff_delay=self.dff.analytical_delay(slew=slew, load=self.inv1.input_load())
-        inv1_delay = self.inv1.analytical_delay(slew=dff_delay.slew, load=self.inv2.input_load()) 
-        inv2_delay = self.inv2.analytical_delay(slew=inv1_delay.slew, load=load)
+        dff_delay=self.dff.analytical_delay(corner, slew=slew, load=self.inv1.input_load())
+        inv1_delay = self.inv1.analytical_delay(corner, slew=dff_delay.slew, load=self.inv2.input_load()) 
+        inv2_delay = self.inv2.analytical_delay(corner, slew=inv1_delay.slew, load=load)
         return dff_delay + inv1_delay + inv2_delay
             
     def get_clk_cin(self):
diff --git a/compiler/modules/dff_buf_array.py b/compiler/modules/dff_buf_array.py
index b179b1c3..56b20dfb 100644
--- a/compiler/modules/dff_buf_array.py
+++ b/compiler/modules/dff_buf_array.py
@@ -187,7 +187,7 @@ class dff_buf_array(design.design):
                 
         
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         return self.dff.analytical_delay(slew=slew, load=load)
 
     def get_clk_cin(self):
diff --git a/compiler/modules/dff_inv.py b/compiler/modules/dff_inv.py
index 436026bb..9b901d3b 100644
--- a/compiler/modules/dff_inv.py
+++ b/compiler/modules/dff_inv.py
@@ -145,10 +145,10 @@ class dff_inv(design.design):
         
         
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """ Calculate the analytical delay of DFF-> INV -> INV """
-        dff_delay=self.dff.analytical_delay(slew=slew, load=self.inv1.input_load())
-        inv1_delay = self.inv1.analytical_delay(slew=dff_delay.slew, load=load) 
+        dff_delay=self.dff.analytical_delay(corner, slew=slew, load=self.inv1.input_load())
+        inv1_delay = self.inv1.analytical_delay(corner, slew=dff_delay.slew, load=load) 
         return dff_delay + inv1_delay 
             
     def get_clk_cin(self):
diff --git a/compiler/modules/dff_inv_array.py b/compiler/modules/dff_inv_array.py
index 91ccfa92..624e13d0 100644
--- a/compiler/modules/dff_inv_array.py
+++ b/compiler/modules/dff_inv_array.py
@@ -185,8 +185,8 @@ class dff_inv_array(design.design):
                 
         
 
-    def analytical_delay(self, slew, load=0.0):
-        return self.dff.analytical_delay(slew=slew, load=load)
+    def analytical_delay(self, corner, slew, load=0.0):
+        return self.dff.analytical_delay(corner, slew=slew, load=load)
 
     def get_clk_cin(self):
         """Return the total capacitance (in relative units) that the clock is loaded by in the dff array"""
diff --git a/compiler/modules/hierarchical_decoder.py b/compiler/modules/hierarchical_decoder.py
index 4bbb6aca..bd17b37e 100644
--- a/compiler/modules/hierarchical_decoder.py
+++ b/compiler/modules/hierarchical_decoder.py
@@ -594,7 +594,7 @@ class hierarchical_decoder(design.design):
                             rotate=90)
 
         
-    def analytical_delay(self, slew, load = 0.0):
+    def analytical_delay(self, corner, slew, load = 0.0):
         # A -> out
         if self.determine_predecodes(self.num_inputs)[1]==0:
             pre = self.pre2_4
@@ -602,15 +602,15 @@ class hierarchical_decoder(design.design):
         else:
             pre = self.pre3_8
             nand = self.nand3
-        a_t_out_delay = pre.analytical_delay(slew=slew,load = nand.input_load())
+        a_t_out_delay = pre.analytical_delay(corner, slew=slew,load = nand.input_load())
 
         # out -> z
-        out_t_z_delay = nand.analytical_delay(slew= a_t_out_delay.slew,
+        out_t_z_delay = nand.analytical_delay(corner, slew= a_t_out_delay.slew,
                                   load = self.inv.input_load())
         result = a_t_out_delay + out_t_z_delay
 
         # Z -> decode_out
-        z_t_decodeout_delay = self.inv.analytical_delay(slew = out_t_z_delay.slew , load = load)
+        z_t_decodeout_delay = self.inv.analytical_delay(corner, slew = out_t_z_delay.slew , load = load)
         result = result + z_t_decodeout_delay
         return result
 
diff --git a/compiler/modules/hierarchical_predecode2x4.py b/compiler/modules/hierarchical_predecode2x4.py
index 83e93f85..f50a43c1 100644
--- a/compiler/modules/hierarchical_predecode2x4.py
+++ b/compiler/modules/hierarchical_predecode2x4.py
@@ -51,15 +51,15 @@ class hierarchical_predecode2x4(hierarchical_predecode):
         return combination 
 
 
-    def analytical_delay(self, slew, load = 0.0 ):
+    def analytical_delay(self, corner, slew, load = 0.0 ):
         # in -> inbar
-        a_t_b_delay = self.inv.analytical_delay(slew=slew, load=self.nand.input_load())
+        a_t_b_delay = self.inv.analytical_delay(corner, slew=slew, load=self.nand.input_load())
 
         # inbar -> z
-        b_t_z_delay = self.nand.analytical_delay(slew=a_t_b_delay.slew, load=self.inv.input_load())
+        b_t_z_delay = self.nand.analytical_delay(corner, slew=a_t_b_delay.slew, load=self.inv.input_load())
 
         # Z -> out
-        a_t_out_delay = self.inv.analytical_delay(slew=b_t_z_delay.slew, load=load)
+        a_t_out_delay = self.inv.analytical_delay(corner, slew=b_t_z_delay.slew, load=load)
 
         return a_t_b_delay + b_t_z_delay + a_t_out_delay
 
diff --git a/compiler/modules/hierarchical_predecode3x8.py b/compiler/modules/hierarchical_predecode3x8.py
index 109e8160..820427c7 100644
--- a/compiler/modules/hierarchical_predecode3x8.py
+++ b/compiler/modules/hierarchical_predecode3x8.py
@@ -60,15 +60,15 @@ class hierarchical_predecode3x8(hierarchical_predecode):
         return combination
 
 
-    def analytical_delay(self, slew, load = 0.0 ):
+    def analytical_delay(self, corner, slew, load = 0.0 ):
         # A -> Abar
-        a_t_b_delay = self.inv.analytical_delay(slew=slew, load=self.nand.input_load())
+        a_t_b_delay = self.inv.analytical_delay(corner, slew=slew, load=self.nand.input_load())
 
         # Abar -> z
-        b_t_z_delay = self.nand.analytical_delay(slew=a_t_b_delay.slew, load=self.inv.input_load())
+        b_t_z_delay = self.nand.analytical_delay(corner, slew=a_t_b_delay.slew, load=self.inv.input_load())
 
         # Z -> out
-        a_t_out_delay = self.inv.analytical_delay(slew=b_t_z_delay.slew, load=load)
+        a_t_out_delay = self.inv.analytical_delay(corner, slew=b_t_z_delay.slew, load=load)
 
         return a_t_b_delay + b_t_z_delay + a_t_out_delay
 
diff --git a/compiler/modules/multibank.py b/compiler/modules/multibank.py
index 1b9e6194..15882f8b 100644
--- a/compiler/modules/multibank.py
+++ b/compiler/modules/multibank.py
@@ -816,19 +816,19 @@ class multibank(design.design):
                      offset=in_pin + self.m2m3_via_offset,
                      rotate=90)
         
-    def analytical_delay(self, slew, load):
+    def analytical_delay(self, corner, slew, load):
         """ return  analytical delay of the bank"""
-        decoder_delay = self.row_decoder.analytical_delay(slew, self.wordline_driver.input_load())
+        decoder_delay = self.row_decoder.analytical_delay(corner, slew, self.wordline_driver.input_load())
 
-        word_driver_delay = self.wordline_driver.analytical_delay(decoder_delay.slew, self.bitcell_array.input_load())
+        word_driver_delay = self.wordline_driver.analytical_delay(corner, decoder_delay.slew, self.bitcell_array.input_load())
 
-        bitcell_array_delay = self.bitcell_array.analytical_delay(word_driver_delay.slew)
+        bitcell_array_delay = self.bitcell_array.analytical_delay(corner, word_driver_delay.slew)
 
-        bl_t_data_out_delay = self.sense_amp_array.analytical_delay(bitcell_array_delay.slew,
+        bl_t_data_out_delay = self.sense_amp_array.analytical_delay(corner, bitcell_array_delay.slew,
                                                                     self.bitcell_array.output_load())
         # output load of bitcell_array is set to be only small part of bl for sense amp.
 
-        data_t_DATA_delay = self.tri_gate_array.analytical_delay(bl_t_data_out_delay.slew, load)
+        data_t_DATA_delay = self.tri_gate_array.analytical_delay(corner, bl_t_data_out_delay.slew, load)
 
         result = decoder_delay + word_driver_delay + bitcell_array_delay + bl_t_data_out_delay + data_t_DATA_delay
         return result
diff --git a/compiler/modules/sense_amp.py b/compiler/modules/sense_amp.py
index 9601259c..5b9808a8 100644
--- a/compiler/modules/sense_amp.py
+++ b/compiler/modules/sense_amp.py
@@ -31,11 +31,11 @@ class sense_amp(design.design):
         bitline_pmos_size = 8 #FIXME: This should be set somewhere and referenced. Probably in tech file.
         return spice["min_tx_drain_c"]*(bitline_pmos_size/parameter["min_tx_size"])#ff   
         
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         from tech import spice
         r = spice["min_tx_r"]/(10)
         c_para = spice["min_tx_drain_c"]
-        result = self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew)
+        result = self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew)
         return self.return_delay(result.delay, result.slew)
 
     def analytical_power(self, proc, vdd, temp, load):
diff --git a/compiler/modules/sense_amp_array.py b/compiler/modules/sense_amp_array.py
index dc80a13b..47969fd1 100644
--- a/compiler/modules/sense_amp_array.py
+++ b/compiler/modules/sense_amp_array.py
@@ -136,8 +136,8 @@ class sense_amp_array(design.design):
     def input_load(self):
         return self.amp.input_load()
     
-    def analytical_delay(self, slew, load=0.0):
-        return self.amp.analytical_delay(slew=slew, load=load)
+    def analytical_delay(self, corner, slew, load=0.0):
+        return self.amp.analytical_delay(corner, slew=slew, load=load)
         
     def get_en_cin(self):
         """Get the relative capacitance of all the sense amp enable connections in the array"""
diff --git a/compiler/modules/single_level_column_mux_array.py b/compiler/modules/single_level_column_mux_array.py
index 49293568..7f20cfb5 100644
--- a/compiler/modules/single_level_column_mux_array.py
+++ b/compiler/modules/single_level_column_mux_array.py
@@ -216,13 +216,14 @@ class single_level_column_mux_array(design.design):
                              offset= br_out_offset,
                              rotate=90)
 
-    def analytical_delay(self, vdd, slew, load=0.0):
+    def analytical_delay(self, corner, vdd, slew, load=0.0):
         from tech import spice, parameter
+        proc,volt,temp = corner
         r = spice["min_tx_r"]/(self.mux.ptx_width/parameter["min_tx_size"])
         #Drains of mux transistors make up capacitance. 
         c_para = spice["min_tx_drain_c"]*(self.mux.ptx_width/parameter["min_tx_size"])*self.words_per_row#ff
-        volt_swing = spice["v_threshold_typical"]/vdd
+        volt_swing = spice["v_threshold_typical"]/volt
         
-        result = self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew, swing = volt_swing)
+        result = self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew, swing = volt_swing)
         return self.return_delay(result.delay, result.slew)            
             
diff --git a/compiler/modules/tri_gate.py b/compiler/modules/tri_gate.py
index da42c7a8..61d9da39 100644
--- a/compiler/modules/tri_gate.py
+++ b/compiler/modules/tri_gate.py
@@ -27,11 +27,11 @@ class tri_gate(design.design):
         self.height = tri_gate.height
         self.pin_map = tri_gate.pin_map
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         from tech import spice
         r = spice["min_tx_r"]
         c_para = spice["min_tx_drain_c"]
-        return self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew)
+        return self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew)
         
     def analytical_power(self, proc, vdd, temp, load):
         """Returns dynamic and leakage power. Results in nW"""
diff --git a/compiler/modules/tri_gate_array.py b/compiler/modules/tri_gate_array.py
index d56e9c96..c9dee703 100644
--- a/compiler/modules/tri_gate_array.py
+++ b/compiler/modules/tri_gate_array.py
@@ -116,6 +116,6 @@ class tri_gate_array(design.design):
         
 
 
-    def analytical_delay(self, slew, load=0.0):
-        return self.tri.analytical_delay(slew = slew, load = load)
+    def analytical_delay(self, corner, slew, load=0.0):
+        return self.tri.analytical_delay(corner, slew = slew, load = load)
         
diff --git a/compiler/modules/wordline_driver.py b/compiler/modules/wordline_driver.py
index 830c28de..6ddba9de 100644
--- a/compiler/modules/wordline_driver.py
+++ b/compiler/modules/wordline_driver.py
@@ -210,12 +210,12 @@ class wordline_driver(design.design):
                                                end=wl_offset-vector(self.m1_width,0))
 
 
-    def analytical_delay(self, slew, load=0):
+    def analytical_delay(self, corner, slew, load=0):
         # decode -> net
-        decode_t_net = self.nand2.analytical_delay(slew, self.inv.input_load())
+        decode_t_net = self.nand2.analytical_delay(corner, slew, self.inv.input_load())
 
         # net -> wl
-        net_t_wl = self.inv.analytical_delay(decode_t_net.slew, load)
+        net_t_wl = self.inv.analytical_delay(corner, decode_t_net.slew, load)
 
         return decode_t_net + net_t_wl
 
diff --git a/compiler/pgates/pand2.py b/compiler/pgates/pand2.py
index a5805728..54787282 100644
--- a/compiler/pgates/pand2.py
+++ b/compiler/pgates/pand2.py
@@ -107,10 +107,10 @@ class pand2(pgate.pgate):
         
         
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """ Calculate the analytical delay of DFF-> INV -> INV """
-        nand_delay = selfnand.analytical_delay(slew=slew, load=self.inv.input_load()) 
-        inv_delay = self.inv.analytical_delay(slew=nand_delay.slew, load=load)
+        nand_delay = self.nand.analytical_delay(corner, slew=slew, load=self.inv.input_load()) 
+        inv_delay = self.inv.analytical_delay(corner, slew=nand_delay.slew, load=load)
         return nand_delay + inv_delay
     
     def get_stage_efforts(self, external_cout, inp_is_rise=False):
diff --git a/compiler/pgates/pbuf.py b/compiler/pgates/pbuf.py
index a0b36111..9d73c004 100644
--- a/compiler/pgates/pbuf.py
+++ b/compiler/pgates/pbuf.py
@@ -110,10 +110,10 @@ class pbuf(pgate.pgate):
         
         
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """ Calculate the analytical delay of DFF-> INV -> INV """
-        inv1_delay = self.inv1.analytical_delay(slew=slew, load=self.inv2.input_load()) 
-        inv2_delay = self.inv2.analytical_delay(slew=inv1_delay.slew, load=load)
+        inv1_delay = self.inv1.analytical_delay(corner, slew=slew, load=self.inv2.input_load()) 
+        inv2_delay = self.inv2.analytical_delay(corner, slew=inv1_delay.slew, load=load)
         return inv1_delay + inv2_delay
     
     def get_stage_efforts(self, external_cout, inp_is_rise=False):
diff --git a/compiler/pgates/pdriver.py b/compiler/pgates/pdriver.py
index 23f3f4f8..daf4d334 100644
--- a/compiler/pgates/pdriver.py
+++ b/compiler/pgates/pdriver.py
@@ -172,7 +172,7 @@ class pdriver(pgate.pgate):
     def input_load(self):
         return self.inv_list[0].input_load()
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """Calculate the analytical delay of INV1 -> ... -> INVn"""
 
         cout_list = []
@@ -184,7 +184,7 @@ class pdriver(pgate.pgate):
         
         delays = []
         for inv,cout in zip(self.inv_list,cout_list):
-            delays.append(inv.analytical_delay(slew=input_slew, load=cout))
+            delays.append(inv.analytical_delay(corner, slew=input_slew, load=cout))
             input_slew = delays[-1].slew
 
         delay = delays[0]
diff --git a/compiler/pgates/pinv.py b/compiler/pgates/pinv.py
index f1ba89f4..867deee2 100644
--- a/compiler/pgates/pinv.py
+++ b/compiler/pgates/pinv.py
@@ -261,10 +261,10 @@ class pinv(pgate.pgate):
     def input_load(self):
         return ((self.nmos_size+self.pmos_size)/parameter["min_tx_size"])*spice["min_tx_gate_c"]
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         r = spice["min_tx_r"]/(self.nmos_size/parameter["min_tx_size"])
         c_para = spice["min_tx_drain_c"]*(self.nmos_size/parameter["min_tx_size"])#ff
-        return self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew)
+        return self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew)
         
     def analytical_power(self, proc, vdd, temp, load):
         """Returns dynamic and leakage power. Results in nW"""
diff --git a/compiler/pgates/pinvbuf.py b/compiler/pgates/pinvbuf.py
index e950bd3f..06936895 100644
--- a/compiler/pgates/pinvbuf.py
+++ b/compiler/pgates/pinvbuf.py
@@ -177,10 +177,10 @@ class pinvbuf(design.design):
         
         
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         """ Calculate the analytical delay of DFF-> INV -> INV """
-        inv1_delay = self.inv1.analytical_delay(slew=slew, load=self.inv2.input_load()) 
-        inv2_delay = self.inv2.analytical_delay(slew=inv1_delay.slew, load=load)
+        inv1_delay = self.inv1.analytical_delay(corner, slew=slew, load=self.inv2.input_load()) 
+        inv2_delay = self.inv2.analytical_delay(corner, slew=inv1_delay.slew, load=load)
         return inv1_delay + inv2_delay
             
     def determine_clk_buf_stage_efforts(self, external_cout, inp_is_rise=False):
diff --git a/compiler/pgates/pnand2.py b/compiler/pgates/pnand2.py
index fa24dc1f..8e702f84 100644
--- a/compiler/pgates/pnand2.py
+++ b/compiler/pgates/pnand2.py
@@ -227,10 +227,10 @@ class pnand2(pgate.pgate):
     def input_load(self):
         return ((self.nmos_size+self.pmos_size)/parameter["min_tx_size"])*spice["min_tx_gate_c"]
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         r = spice["min_tx_r"]/(self.nmos_size/parameter["min_tx_size"])
         c_para = spice["min_tx_drain_c"]*(self.nmos_size/parameter["min_tx_size"])#ff
-        return self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew)
+        return self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew)
         
     def analytical_power(self, proc, vdd, temp, load):
         """Returns dynamic and leakage power. Results in nW"""
diff --git a/compiler/pgates/pnand3.py b/compiler/pgates/pnand3.py
index d4554863..4efd1820 100644
--- a/compiler/pgates/pnand3.py
+++ b/compiler/pgates/pnand3.py
@@ -240,10 +240,10 @@ class pnand3(pgate.pgate):
     def input_load(self):
         return ((self.nmos_size+self.pmos_size)/parameter["min_tx_size"])*spice["min_tx_gate_c"]
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         r = spice["min_tx_r"]/(self.nmos_size/parameter["min_tx_size"])
         c_para = spice["min_tx_drain_c"]*(self.nmos_size/parameter["min_tx_size"])#ff
-        return self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew)
+        return self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew)
         
     def analytical_power(self, proc, vdd, temp, load):
         """Returns dynamic and leakage power. Results in nW"""
diff --git a/compiler/pgates/pnor2.py b/compiler/pgates/pnor2.py
index d1be51f3..0c62cfe9 100644
--- a/compiler/pgates/pnor2.py
+++ b/compiler/pgates/pnor2.py
@@ -212,10 +212,10 @@ class pnor2(pgate.pgate):
     def input_load(self):
         return ((self.nmos_size+self.pmos_size)/parameter["min_tx_size"])*spice["min_tx_gate_c"]
 
-    def analytical_delay(self, slew, load=0.0):
+    def analytical_delay(self, corner, slew, load=0.0):
         r = spice["min_tx_r"]/(self.nmos_size/parameter["min_tx_size"])
         c_para = spice["min_tx_drain_c"]*(self.nmos_size/parameter["min_tx_size"])#ff
-        return self.cal_delay_with_rc(r = r, c =  c_para+load, slew = slew)
+        return self.cal_delay_with_rc(corner, r = r, c =  c_para+load, slew = slew)
         
     def analytical_power(self, proc, vdd, temp, load):
         """Returns dynamic and leakage power. Results in nW"""
diff --git a/compiler/sram_base.py b/compiler/sram_base.py
index 61d3639d..611900e4 100644
--- a/compiler/sram_base.py
+++ b/compiler/sram_base.py
@@ -499,9 +499,9 @@ class sram_base(design, verilog, lef):
         sp.close()
 
         
-    def analytical_delay(self, vdd, slew,load):
+    def analytical_delay(self, corner, slew,load):
         """ LH and HL are the same in analytical model. """
-        return self.bank.analytical_delay(vdd,slew,load)
+        return self.bank.analytical_delay(corner,slew,load)
         
     def determine_wordline_stage_efforts(self, inp_is_rise=True):
         """Get the all the stage efforts for each stage in the path from clk_buf to a wordline"""
diff --git a/technology/freepdk45/tech/tech.py b/technology/freepdk45/tech/tech.py
index eccfd1c8..760d2a5a 100644
--- a/technology/freepdk45/tech/tech.py
+++ b/technology/freepdk45/tech/tech.py
@@ -300,6 +300,8 @@ spice["channel"] = drc["minlength_channel"]
 spice["clk"] = "clk"
 
 # analytical delay parameters
+spice["vdd_nominal"] = 1.0    # Typical Threshold voltage in Volts
+spice["temp_nominal"] = 25.0   # Typical Threshold voltage in Volts
 spice["v_threshold_typical"] = 0.4    # Typical Threshold voltage in Volts
 spice["wire_unit_r"] = 0.075     # Unit wire resistance in ohms/square
 spice["wire_unit_c"] = 0.64      # Unit wire capacitance ff/um^2
diff --git a/technology/scn3me_subm/tech/tech.py b/technology/scn3me_subm/tech/tech.py
index d448b5dc..e088eff9 100755
--- a/technology/scn3me_subm/tech/tech.py
+++ b/technology/scn3me_subm/tech/tech.py
@@ -240,6 +240,8 @@ spice["clk"] = "clk"
 
 # analytical delay parameters
 # FIXME: These need to be updated for SCMOS, they are copied from FreePDK45.
+spice["vdd_nominal"] = 5.0    # Typical Threshold voltage in Volts
+spice["temp_nominal"] = 25.0   # Typical Threshold voltage in Volts
 spice["v_threshold_typical"] = 1.3   # Typical Threshold voltage in Volts
 spice["wire_unit_r"] = 0.075    # Unit wire resistance in ohms/square
 spice["wire_unit_c"] = 0.64     # Unit wire capacitance ff/um^2
diff --git a/technology/scn4m_subm/tech/tech.py b/technology/scn4m_subm/tech/tech.py
index 8b6ee827..78222fd6 100755
--- a/technology/scn4m_subm/tech/tech.py
+++ b/technology/scn4m_subm/tech/tech.py
@@ -266,6 +266,8 @@ spice["clk"] = "clk"
 
 # analytical delay parameters
 # FIXME: These need to be updated for SCMOS, they are copied from FreePDK45.
+spice["vdd_nominal"] = 5.0    # Typical Threshold voltage in Volts
+spice["temp_nominal"] = 25.0   # Typical Threshold voltage in Volts
 spice["v_threshold_typical"] = 1.3   # Typical Threshold voltage in Volts
 spice["wire_unit_r"] = 0.075    # Unit wire resistance in ohms/square
 spice["wire_unit_c"] = 0.64     # Unit wire capacitance ff/um^2