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* 51 stage Ring-Osc.
vin in out 2 pulse 2 0 0.1n 5n 1 1 1
vdd dd 0 dc 0 pulse 0 2 0 1n 1 1 1
vss ss 0 dc 0
ve sub 0 dc 0
xinv1 dd ss sub in out25 inv25
xinv2 dd ss sub out25 out50 inv25
xinv5 dd ss sub out50 out inv1
xinv11 dd ss sub out buf inv1
cout buf ss 1pF
xdum ss dum
.option itl1=500 gmin=1e-15 itl4=10 noacct
*.dc vdd 0 2 0.01
.tran 0.2n 50n
.include nmosdd.mod
.include pmosdd.mod
.include lib.h
.end
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