30 lines
842 B
Plaintext
30 lines
842 B
Plaintext
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
|