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*****************==== 11-Stage CMOS RO ====*******************
*********** MOS1 or VDMOS ************************************
vdd 1 0 5.0
.subckt inv out in vdd vss
mp1 out in vdd p1 l=2u w=20u
mn1 out in vss n1 l=2u w=10u
c1 out vss 0.2p
.ends
xinv1 3 2 1 0 inv
xinv2 4 3 1 0 inv
xinv3 5 4 1 0 inv
xinv4 6 5 1 0 inv
xinv5 7 6 1 0 inv
xinv6 8 7 1 0 inv
xinv7 9 8 1 0 inv
xinv8 10 9 1 0 inv
xinv9 2 10 1 0 inv
.model N1 vdmos cgdmin=0.05p cgdmax=0.2p a=1.2 cgs=0.15p rg=10 kp=2e-5 rb=1e7 cjo=1n subslope=0.2
.model P1 vdmos cgdmin=0.05p cgdmax=0.2p a=1.2 cgs=0.15p rg=10 kp=2e-5 rb=1e7 cjo=1n pchan subslope=0.2
.tran 0.1n 1u
.control
run
rusage
* current and output in a single plot
plot v(6) 1000*(-I(vdd)) ylimit -1 6
.endc
.end
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