diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__gpiov2_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__gpiov2_pad.lef
index 30586a9..e69e716 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__gpiov2_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__gpiov2_pad.lef
@@ -64,6 +64,7 @@
     END
   END DM[2]
   PIN DM[1]
+    ANTENNAGATEAREA 0.500000 ;
     DIRECTION INPUT ;
     USE SIGNAL ;
     PORT
@@ -80,6 +81,7 @@
     END
   END DM[0]
   PIN ENABLE_H
+    ANTENNAGATEAREA 3.600000 ;
     DIRECTION INPUT ;
     USE SIGNAL ;
     PORT
@@ -88,6 +90,7 @@
     END
   END ENABLE_H
   PIN ENABLE_INP_H
+    ANTENNAGATEAREA 2.400000 ;
     DIRECTION INPUT ;
     USE SIGNAL ;
     PORT
@@ -96,6 +99,7 @@
     END
   END ENABLE_INP_H
   PIN ENABLE_VDDA_H
+    ANTENNAGATEAREA 2.000000 ;
     DIRECTION INPUT ;
     USE SIGNAL ;
     PORT
@@ -112,6 +116,7 @@
     END
   END ENABLE_VDDIO
   PIN ENABLE_VSWITCH_H
+    ANTENNAGATEAREA 0.307500 ;
     DIRECTION INPUT ;
     USE SIGNAL ;
     PORT
@@ -120,6 +125,7 @@
     END
   END ENABLE_VSWITCH_H
   PIN HLD_H_N
+    ANTENNAGATEAREA 1.200000 ;
     DIRECTION INPUT ;
     USE SIGNAL ;
     PORT
@@ -144,6 +150,7 @@
     END
   END IB_MODE_SEL
   PIN IN
+    ANTENNADIFFAREA 0.630000 ;
     DIRECTION OUTPUT ;
     USE SIGNAL ;
     PORT
@@ -152,6 +159,7 @@
     END
   END IN
   PIN IN_H
+    ANTENNADIFFAREA 0.928125 ;
     DIRECTION OUTPUT ;
     USE SIGNAL ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_hvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_hvc_pad.lef
index bc1af4d..432893d 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_hvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_hvc_pad.lef
@@ -44,6 +44,7 @@
     END
   END DRN_HVC
   PIN SRC_BDY_HVC
+    ANTENNADIFFAREA 12.516800 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_lvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_lvc_pad.lef
index faee916..1db2e4f 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_lvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vccd_lvc_pad.lef
@@ -32,6 +32,7 @@
     END
   END AMUXBUS_B
   PIN DRN_LVC1
+    ANTENNADIFFAREA 6.889900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -40,6 +41,7 @@
     END
   END DRN_LVC1
   PIN DRN_LVC2
+    ANTENNADIFFAREA 3.870900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_hvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_hvc_pad.lef
index e30fe64..c18d2b8 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_hvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_hvc_pad.lef
@@ -44,6 +44,7 @@
     END
   END DRN_HVC
   PIN SRC_BDY_HVC
+    ANTENNADIFFAREA 12.516800 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_lvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_lvc_pad.lef
index 819f513..f71d82f 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_lvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vdda_lvc_pad.lef
@@ -32,6 +32,7 @@
     END
   END AMUXBUS_B
   PIN DRN_LVC1
+    ANTENNADIFFAREA 6.889900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -40,6 +41,7 @@
     END
   END DRN_LVC1
   PIN DRN_LVC2
+    ANTENNADIFFAREA 3.870900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_hvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_hvc_pad.lef
index 57c4031..c810653 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_hvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_hvc_pad.lef
@@ -44,6 +44,7 @@
     END
   END DRN_HVC
   PIN SRC_BDY_HVC
+    ANTENNADIFFAREA 12.516800 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_lvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_lvc_pad.lef
index c21a75e..b796589 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_lvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vddio_lvc_pad.lef
@@ -32,6 +32,7 @@
     END
   END AMUXBUS_B
   PIN DRN_LVC1
+    ANTENNADIFFAREA 6.889900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -40,6 +41,7 @@
     END
   END DRN_LVC1
   PIN DRN_LVC2
+    ANTENNADIFFAREA 3.870900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_hvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_hvc_pad.lef
index 8170349..9ce5616 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_hvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_hvc_pad.lef
@@ -44,6 +44,7 @@
     END
   END DRN_HVC
   PIN SRC_BDY_HVC
+    ANTENNADIFFAREA 12.516800 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_lvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_lvc_pad.lef
index 9998a11..9bfe8f8 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_lvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssa_lvc_pad.lef
@@ -32,6 +32,7 @@
     END
   END AMUXBUS_B
   PIN DRN_LVC1
+    ANTENNADIFFAREA 6.889900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -40,6 +41,7 @@
     END
   END DRN_LVC1
   PIN DRN_LVC2
+    ANTENNADIFFAREA 3.870900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_hvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_hvc_pad.lef
index 1b6ec64..40d6e08 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_hvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_hvc_pad.lef
@@ -44,6 +44,7 @@
     END
   END DRN_HVC
   PIN SRC_BDY_HVC
+    ANTENNADIFFAREA 12.516800 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_lvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_lvc_pad.lef
index 3022206..5812168 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_lvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssd_lvc_pad.lef
@@ -32,6 +32,7 @@
     END
   END AMUXBUS_B
   PIN DRN_LVC1
+    ANTENNADIFFAREA 6.889900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -40,6 +41,7 @@
     END
   END DRN_LVC1
   PIN DRN_LVC2
+    ANTENNADIFFAREA 3.870900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -296,6 +298,7 @@
     END
   END VSSIO
   PIN VSSD
+    ANTENNADIFFAREA 30.137499 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_hvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_hvc_pad.lef
index aa35508..62c88e0 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_hvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_hvc_pad.lef
@@ -44,6 +44,7 @@
     END
   END DRN_HVC
   PIN SRC_BDY_HVC
+    ANTENNADIFFAREA 12.516800 ;
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
diff --git a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_lvc_pad.lef b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_lvc_pad.lef
index 7f326f5..93e0107 100644
--- a/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_lvc_pad.lef
+++ b/sky130/custom/sky130_fd_io/lef/sky130_ef_io__vssio_lvc_pad.lef
@@ -32,6 +32,7 @@
     END
   END AMUXBUS_B
   PIN DRN_LVC1
+    ANTENNADIFFAREA 6.889900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT
@@ -40,6 +41,7 @@
     END
   END DRN_LVC1
   PIN DRN_LVC2
+    ANTENNADIFFAREA 3.870900 ;
     DIRECTION INOUT ;
     USE POWER ;
     PORT