ngspice/examples/adms/psp/psp_ro.sp

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* PSP models
* simple 5-stage ring oscillator
.param Vcc = 1.2
.csparam vcc='Vcc'
* Path to the models
.include psp102_nmos.mod
.include psp102_pmos.mod
* the voltage sources:
Vdd vdd gnd DC 'Vcc'
V1 in gnd pulse(0 'Vcc' 0p 200p 100p 1n 2n)
Vmeas vss 0 0
Xnot1 in vdd vss in2 not1
Xnot2 in2 vdd vss in3 not1
Xnot3 in3 vdd vss in4 not1
Xnot4 in4 vdd vss in5 not1
Xnot5 in5 vdd vss in not1
*Rout out 0 1k
.subckt not1 a vdd vss z
m01 z a vdd vdd pch l=0.1u w=1u as=0.26235 ad=0.26235 ps=2.51 pd=2.51
m02 z a vss vss nch l=0.1u w=0.5u as=0.131175 ad=0.131175 ps=1.52 pd=1.52
c3 a vss 0.384f
c2 z vss 0.576f
.ends
* simulation command:
.tran 10p 10n uic
.control
run
set xbrushwidth=3
plot in
rusage
.endc
.end