Add some description, correct minor bugs.

examples/xspice/table/table-generator-b4-3d.sp

@@ -1,4 +1,17 @@
-** NMOSFET: table generator with BSIM4 2D (Vdrain, Vgate)
+** NMOSFET: table generator with BSIM4 3D (Vdrain, Vgate, Vbulk)
+* This file may be run by 'ngspice table-generator-b4-3d.sp'
+* It will generate a 3D data table by simulating the MOS drain current 
+* as function of drain and gate voltages. The simulation uses
+* the ngspice BSIM4.6.1 MOS model and Berkeley model parameters.
+* This table is an input file for the XSPICE 3D table model.
+* You have to select NMOS or PMOS by manually editing this file: currently
+* NMOS is selected. For PMOS change '*' in column 1 
+* for CSPARAM, m1, outfile, echo *table...
+* In addition you may change the step sizes vdstep vgstep vbstep in CSPARAM
+* to obtain the required resolution for the data.
+* These tables will contain pure dc data. For transient simulation you may
+* need to add some capacitors to the device model for a 'real world' simulation.
+
 *NMOS
 .csparam vdstart=-0.1
 .csparam vdstop=1.8
@@ -22,8 +35,8 @@
 *.csparam vbstep=0.2
 
 ** Circuit Description **
-m1 2 1 3 4 n1 L=0.13u W=10.0u rgeoMod=1
-*m1 2 1 3 4 p1 L=0.13u W=10.0u rgeoMod=1
+m1 2 1 3 4 nbsim4 L=0.13u W=10.0u rgeoMod=1
+*m1 2 1 3 4 pbsim4 L=0.13u W=10.0u rgeoMod=1
 vgs 1 0 1.8
 vds 2 0 1.8
 vss 3 0 0
@@ -32,9 +45,11 @@ vbs 4 0 0
 .control
 ** output file **
 set outfile = "bsim4n-3d-1.table"
+*set outfile = "bsim4p-3d-1.table"
 
 save i(vss)
 echo * 3D table for nmos bsim 4 > $outfile
+*echo * 3D table for nmos bsim 4 > $outfile
 
 let xcount = floor((vdstop-vdstart)/vdstep) + 1
 let ycount = floor((vgstop-vgstart)/vgstep) + 1
@@ -101,7 +116,7 @@ while lcz < zcount
 end
 .endc
 
-
-.include ./modelcards/modelcard.pmos
 .include ./modelcards/modelcard.nmos
+.include ./modelcards/modelcard.pmos
+
 .end