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+CMOS Ring Oscillator
+
+Vdd 1 0 5.0v
+Vss 2 0 0.0v
+
+X1 1 2 3 4 INV
+X2 1 2 4 5 INV
+X3 1 2 5 3 INV
+*X4 1 2 6 7 INV
+*X5 1 2 7 8 INV
+*X6 1 2 8 9 INV
+*X7 1 2 9 3 INV
+
+.IC V(3)=0.0v V(4)=2.5v V(5)=5.0v
+* V(6)=0.0v V(7)=5.0v V(8)=0.0v V(9)=5.0v
+
+Vin 3 0 2.5v
+
+.SUBCKT INV 1 2 3 4
+* Vdd Vss Vin Vout
+M1 14 13 15 16 M_PMOS w=6.0u
+M2 24 23 25 26 M_NMOS w=3.0u
+
+Vgp 3 13 0.0v
+Vdp 4 14 0.0v
+Vsp 1 15 0.0v
+Vbp 1 16 0.0v
+
+Vgn 3 23 0.0v
+Vdn 4 24 0.0v
+Vsn 2 25 0.0v
+Vbn 2 26 0.0v
+.ENDS INV
+
+.model M_NMOS numos
++ x.mesh l=0.0 n=1
++ x.mesh l=0.6 n=4
++ x.mesh l=0.7 n=5
++ x.mesh l=1.0 n=7
++ x.mesh l=1.2 n=11
++ x.mesh l=3.2 n=21
++ x.mesh l=3.4 n=25
++ x.mesh l=3.7 n=27
++ x.mesh l=3.8 n=28
++ x.mesh l=4.4 n=31
++
++ y.mesh l=-.05 n=1
++ y.mesh l=0.0 n=5
++ y.mesh l=.05 n=9
++ y.mesh l=0.3 n=14
++ y.mesh l=2.0 n=19
++
++ region num=1 material=1 y.l=0.0
++ material num=1 silicon
++ mobility material=1 concmod=sg fieldmod=sg
++ mobility material=1 elec major
++ mobility material=1 elec minor
++ mobility material=1 hole major
++ mobility material=1 hole minor
++
++ region num=2 material=2 y.h=0.0 x.l=0.7 x.h=3.7
++ material num=2 oxide
++
++ elec num=1 x.l=3.8 x.h=4.4 y.l=0.0 y.h=0.0
++ elec num=2 x.l=0.7 x.h=3.7 iy.l=1 iy.h=1
++ elec num=3 x.l=0.0 x.h=0.6 y.l=0.0 y.h=0.0
++ elec num=4 x.l=0.0 x.h=4.4 y.l=2.0 y.h=2.0
++
++ doping unif p.type conc=2.5e16 x.l=0.0 x.h=4.4 y.l=0.0 y.h=2.0
++ doping unif p.type conc=1e16 x.l=0.0 x.h=4.4 y.l=0.0 y.h=0.05
++ doping unif n.type conc=1e20 x.l=0.0 x.h=1.1 y.l=0.0 y.h=0.2
++ doping unif n.type conc=1e20 x.l=3.3 x.h=4.4 y.l=0.0 y.h=0.2
++
++ models concmob fieldmob bgn srh conctau
++ method ac=direct onec
+
+.model M_PMOS numos
++ x.mesh l=0.0 n=1
++ x.mesh l=0.6 n=4
++ x.mesh l=0.7 n=5
++ x.mesh l=1.0 n=7
++ x.mesh l=1.2 n=11
++ x.mesh l=3.2 n=21
++ x.mesh l=3.4 n=25
++ x.mesh l=3.7 n=27
++ x.mesh l=3.8 n=28
++ x.mesh l=4.4 n=31
++
++ y.mesh l=-.05 n=1
++ y.mesh l=0.0 n=5
++ y.mesh l=.05 n=9
++ y.mesh l=0.3 n=14
++ y.mesh l=2.0 n=19
++
++ region num=1 material=1 y.l=0.0
++ material num=1 silicon
++ mobility material=1 concmod=sg fieldmod=sg
++ mobility material=1 elec major
++ mobility material=1 elec minor
++ mobility material=1 hole major
++ mobility material=1 hole minor
++
++ region num=2 material=2 y.h=0.0 x.l=0.7 x.h=3.7
++ material num=2 oxide
++
++ elec num=1 x.l=3.8 x.h=4.4 y.l=0.0 y.h=0.0
++ elec num=2 x.l=0.7 x.h=3.7 iy.l=1 iy.h=1
++ elec num=3 x.l=0.0 x.h=0.6 y.l=0.0 y.h=0.0
++ elec num=4 x.l=0.0 x.h=4.4 y.l=2.0 y.h=2.0
++
++ doping unif n.type conc=1e16 x.l=0.0 x.h=4.4 y.l=0.0 y.h=2.0
++ doping unif p.type conc=3e16 x.l=0.0 x.h=4.4 y.l=0.0 y.h=0.05
++ doping unif p.type conc=1e20 x.l=0.0 x.h=1.1 y.l=0.0 y.h=0.2
++ doping unif p.type conc=1e20 x.l=3.3 x.h=4.4 y.l=0.0 y.h=0.2
++
++ models concmob fieldmob bgn srh conctau
++ method ac=direct onec
+
+.tran 0.1ns 5ns
+.print v(4)
+.options acct bypass=1 method=gear
+.end