Safe Operating Area check for lv- and hv-mos

Signed-off-by: Dietmar Warning <[email protected]>

Author: Dietmar Warning

.gitignore

@@ -186,3 +186,6 @@ run_git-pulse
 
 # Git-cliff
 cliff*toml
+
+# OpneVAF compiled models dir
+*/*/ngspice/osdi

ihp-sg13g2/libs.tech/ngspice/models/sg13g2_moshv_mod.lib

@@ -1,3 +1,4 @@
+.param SWSOA = 0
 *******************************************************************************
 *                                                                             *
 * Library:      SG13G2_dev                                                    *

ihp-sg13g2/libs.tech/ngspice/models/sg13g2_moshv_parm.lib

@@ -187,7 +187,9 @@
 + rshg          =  'rfmode * 20.0'               rgo           =  'rfmode * 35.0'
 + rbulko        =  'rfmode * 0.002 * ng/w'       rwello        =  'rfmode * 0.002 * ng/w'
 + rjunso        =  'rfmode * 5000.0 * l/w'       rjundo        =  'rfmode * 5000.0 * l/w'
-
++ SWSOA = 'SWSOA'
++ VGS_MAX = 3.0 VGD_MAX = 3.0 VGB_MAX = 3.0
++ VDS_MAX = 3.0 VDB_MAX = 1.6 VSB_MAX = 1.6
 
 *******************************************************************************
 *
@@ -337,4 +339,7 @@
 + rshg          =  'rfmode * 40.0'               rgo           =  'rfmode * 15.0'
 + rbulko        =  'rfmode * 0.002 * ng/w'       rwello        =  'rfmode * 0.001 * ng/w'
 + rjunso        =  'rfmode * 5000.0 * l/w'       rjundo        =  'rfmode * 5000.0 * l/w'
++ SWSOA = 'SWSOA'
++ VGS_MAX = 3.0 VGD_MAX = 3.0 VGB_MAX = 3.0
++ VDS_MAX = 3.0 VDB_MAX = 1.6 VSB_MAX = 1.6
 

ihp-sg13g2/libs.tech/ngspice/models/sg13g2_moslv_mod.lib

@@ -1,3 +1,4 @@
+.param SWSOA = 0
 ******************************************************************************* 
 *                                                                             * 
 * Library:      SG13G2_dev                                                    * 

ihp-sg13g2/libs.tech/ngspice/models/sg13g2_moslv_parm.lib

@@ -186,6 +186,9 @@
 + rshg          =  'rfmode * 3.0'                rgo           =  'rfmode * 40.0'
 + rbulko        =  'rfmode * 0.002 * ng/w'       rwello        =  'rfmode * 0.002 * ng/w'
 + rjunso        =  'rfmode * 5000.0 * l/w'       rjundo        =  'rfmode * 5000.0 * l/w'
++ SWSOA = 'SWSOA'
++ VGS_MAX = 1.6 VGD_MAX = 1.6 VGB_MAX = 1.6
++ VDS_MAX = 1.6 VDB_MAX = 1.6 VSB_MAX = 1.6
 
 *******************************************************************************
 *
@@ -336,7 +339,9 @@
 + rshg          =  'rfmode * 20.0'               rgo           =  'rfmode * 22.0'
 + rbulko        =  'rfmode * 0.002 * ng/w'       rwello        =  'rfmode * 0.001 * ng/w'
 + rjunso        =  'rfmode * 5000.0 * l/w'       rjundo        =  'rfmode * 5000.0 * l/w'
-
++ SWSOA = 'SWSOA'
++ VGS_MAX = 1.6 VGD_MAX = 1.6 VGB_MAX = 1.6
++ VDS_MAX = 1.6 VDB_MAX = 1.6 VSB_MAX = 1.6
 
 
 .model nmoscl_psp pspnqs103va                  type          =  +1
@@ -467,3 +472,6 @@
 + rshg          =  'rfmode * 3.0'                rgo           =  'rfmode * 40.0'
 + rbulko        =  'rfmode * 0.002 * ng/w'       rwello        =  'rfmode * 0.002 * ng/w'
 + rjunso        =  'rfmode * 5000.0 * l/w'       rjundo        =  'rfmode * 5000.0 * l/w'
++ SWSOA = 'SWSOA'
++ VGS_MAX = 1.6 VGD_MAX = 1.6 VGB_MAX = 1.6
++ VDS_MAX = 1.6 VDB_MAX = 1.6 VSB_MAX = 1.6

ihp-sg13g2/libs.tech/verilog-a/psp103/PSP103_module.include

@@ -25,6 +25,8 @@
 //
 // Further information can be found in the file releasenotesPSP103.txt
 //
+// Define it to check overvoltage for all 6 branches
+`define SOAcheck
 //  --------------------------------------------------------------------------------------------------------------
 //  Node definitions
 //  --------------------------------------------------------------------------------------------------------------
@@ -651,6 +653,17 @@ electrical BD;
 `MPRnb(WEB            ,0.0        ,""                                   ,"Coefficient for SCB")
 `MPRnb(WEC            ,0.0        ,""                                   ,"Coefficient for SCC")
 
+// Safe operating area check
+`ifdef SOAcheck
+`MPIcc(SWSOA          ,0          ,""         ,0           ,1           ,"Flag for safe operating area check")
+`MPRoo(VGS_MAX        ,1e99       ,""         ,0           ,inf         ,"Max gate source voltage")
+`MPRoo(VGD_MAX        ,1e99       ,""         ,0           ,inf         ,"Max gate drain voltage")
+`MPRoo(VGB_MAX        ,1e99       ,""         ,0           ,inf         ,"Max gate bulk voltage")
+`MPRoo(VDS_MAX        ,1e99       ,""         ,0           ,inf         ,"Max drain source voltage")
+`MPRoo(VDB_MAX        ,1e99       ,""         ,0           ,inf         ,"Max drain bulk voltage")
+`MPRoo(VSB_MAX        ,1e99       ,""         ,0           ,inf         ,"Max source bulk voltage")
+`endif
+
 //  --------------------------------------------------------------------------------------------------------------
 //  JUNCAP Parameters
 //  --------------------------------------------------------------------------------------------------------------
@@ -2142,6 +2155,29 @@ analog begin
             xgs_ov       = -VgsPrime * inv_phita;
             xgd_ov       = -VgdPrime * inv_phita;
 
+            `ifdef SOAcheck
+                if (SWSOA > 0) begin
+                    if (abs(Vgs) > VGS_MAX) begin
+                        $strobe("%M: Vgs=%g has exceeded Vgs_max=%g", Vgs, VGS_MAX);
+                    end
+                    if (abs(VgdPrime) > VGD_MAX) begin
+                        $strobe("%M: Vgd=%g has exceeded Vgd_max=%g", VgdPrime, VGD_MAX);
+                    end
+                    if (abs(Vds) > VDS_MAX) begin
+                        $strobe("%M: Vds=%g has exceeded Vds_max=%g", Vds, VDS_MAX);
+                    end
+                    if (abs(Vgs+Vsb) > VGB_MAX) begin
+                        $strobe("%M: Vgb=%g has exceeded Vgb_max=%g", Vgs+Vsb, VGB_MAX);
+                    end
+                    if (abs(Vsb) > VSB_MAX) begin
+                        $strobe("%M: Vsb=%g has exceeded Vsb_max=%g", Vsb, VSB_MAX);
+                    end
+                    if (abs(VdbPrime) > VDB_MAX) begin
+                        $strobe("%M: Vdb=%g has exceeded Vdb_max=%g", VdbPrime, VDB_MAX);
+                    end
+                end
+            `endif // SOAcheck
+
             // Source-drain interchange
             sigVds       =  1.0;
             if (Vds < 0.0) begin