Vary the total charge, repeat simulation in a loop

examples/xspice/see/repeat_loop_seegen.net

@@ -0,0 +1,43 @@
+* Repeat loop, double exponential current pulses
+
+
+.param tochar = 1e-13  ; tochar dependency on LET not yet defined
+.csparam tochar = 'tochar'
+.param talpha = 500p tbeta=20p  ; tau in exponent for pulse
+.param Inull = 'tochar/(talpha-tbeta)'
+
+R1 n1 0 1e4
+R2 n2 0 1e4
+R3 n3 0 1e4
+R4 n4 0 1e4
+
+
+****  SEE generator without control input, double exponential current sources
+aseegen1 NULL [%id(n1 0) %id(n2 0) %id(n3 0) %id(n4 0)] seemod1
+.model seemod1 seegen (tdelay = 11n tperiod=25n inull='Inull' talpha='talpha' tbeta='tbeta')
+* alternative syntax, if no current measurement required and reference nodes are GND
+*aseegen1 NULL [%i(n1) %i(n2) %i(n3) %i(n4)] seemod1
+
+
+
+* simulation command: 
+.tran 100ps 120ns
+
+*.options method=gear
+
+.control
+set xbrushwidth=3
+*run
+*plot n1 n2+2 n3+4 n4+6
+let newchar = tochar
+repeat 10
+  run
+  plot n1 n2+2 n3+4 n4+6
+  let newchar = newchar - 5e-15
+  alterparam tochar = $&newchar
+  reset
+end
+rusage
+.endc
+
+.end