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Ring CMOS Oscillator
* Oscillation is taken on node "bout".
* Predicted frequency is 3.8e+09 Hz.
*
* PLOT bout
* Supply
vdd vdd gnd 1.2 pwl 0 1.2 1e-9 1.2
rdd vdd vdd_ana 70m
rgnd gnd gnd_ana 70m
* Inverter
mp1 inv1 inv3 vdd_ana vdd_ana pch w=10u l=0.18u
mn1 inv1 inv3 gnd_ana gnd_ana nch w=10u l=0.18u
mp2 inv2 inv1 vdd_ana vdd_ana pch w=10u l=0.18u
mn2 inv2 inv1 gnd_ana gnd_ana nch w=10u l=0.18u
mp3 inv3 inv2 vdd_ana vdd_ana pch w=10u l=0.18u
mn3 inv3 inv2 gnd_ana gnd_ana nch w=10u l=0.18u
* Buffer out
mp4 bout inv3 vdd_ana vdd_ana pch w=10u l=0.18u
mn4 bout inv3 gnd_ana gnd_ana nch w=10u l=0.18u
.model nch nmos ( version=4.7 level=54 lmin=0.1u lmax=20u wmin=0.1u wmax=10u )
.model pch pmos ( version=4.7 level=54 lmin=0.1u lmax=20u wmin=0.1u wmax=10u )
*.tran 0.005n 100n
*.plot tran v(4)
.pss 624e6 500n 1 1024 10 5 5e-3 uic
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