xschem/ring_vco/netlist/ring_vco.spice

**.subckt ring_vco
x1 10 out_ring o1 9 vss not
V1 vss GND DC{Vss} 
V2 vdd vss DC{Vdd} 
x2 10 o1 o2 9 vss not
x3 10 o2 o3 9 vss not
x4 10 o3 o4 9 vss not
x5 10 o4 o5 9 vss not
x6 10 o5 o6 9 vss not
XM1 out_ring net1 9 vss sky130_fd_pr__nfet_01v8 W=1.2 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM2 out_ring net1 10 10 sky130_fd_pr__pfet_01v8 W=1.5 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=2 m=2 
XM3 out_vco out_ring vss vss sky130_fd_pr__nfet_01v8 W=0.6 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM4 out_vco out_ring vdd vdd sky130_fd_pr__pfet_01v8 W=1.5 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM5 10 5 vdd vdd sky130_fd_pr__pfet_01v8 W=1.5 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM6 9 in vss vss sky130_fd_pr__nfet_01v8 W=1.5 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM7 5 5 vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM8 5 in vss vss sky130_fd_pr__nfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
V3 in vss DC{Vin} 
x7 10 o6 o7 9 vss not
x8 10 o7 o8 9 vss not
x9 10 o8 net2 9 vss not
x10 10 net2 net3 9 vss not
x11 10 net3 net4 9 vss not
x12 10 net4 net8 9 vss not
x13 10 net8 net7 9 vss not
x14 10 net7 net6 9 vss not
x15 10 net6 net5 9 vss not
x16 10 net5 net9 9 vss not
x17 10 net9 net10 9 vss not
x18 10 net10 net11 9 vss not
x19 10 net11 net12 9 vss not
x21 out_vco vss outx2 vdd FD_v2
x22 outx2 vss outx4 vdd FD_v2
x23 outx4 vss outx8 vdd FD_v2
x24 outx8 vss outx16 vdd FD_v2
x25 outx16 vss outx32 vdd FD_v2
C1 out vss 2p m=1
XM9 out outx32 vss vss sky130_fd_pr__nfet_01v8 W=1.2 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=2 m=2 
XM10 out outx32 vdd vdd sky130_fd_pr__pfet_01v8 W=1.5 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=4 m=4 
x26 10 net12 net1 en 9 vss nand
V4 en vss PULSE(0 {Vdd} 100ns 1ps 1ps 0.25us 0.5us) 
**** begin user architecture code




* Circuit Parameters
.param vdd  = 1.8
.param vss  = 0.0
.param vin  = 1
.param iref = 200u
.options TEMP = 65.0

* Include Models
.lib ~/skywater/skywater-pdk/libraries/sky130_fd_pr/latest/models/corners/sky130.lib TT

* OP Parameters & Singals to save
.save all  @M.X2.XM1.msky130_fd_pr__nfet_01v8[id] @M.X2.XM1.msky130_fd_pr__nfet_01v8[vth]
+ @M.X2.XM1.msky130_fd_pr__nfet_01v8[vgs] @M.X2.XM1.msky130_fd_pr__nfet_01v8[vds] @M.X2.XM1.msky130_fd_pr__nfet_01v8[vdsat]
+ @M.X2.XM1.msky130_fd_pr__nfet_01v8[gm] @M.X2.XM1.msky130_fd_pr__nfet_01v8[gds] @M.X2.XM1.msky130_fd_pr__nfet_01v8[cgs]
+ @M.X2.XM1.msky130_fd_pr__nfet_01v8[cgd]  @M.X2.XM2.msky130_fd_pr__pfet_01v8[id] @M.X2.XM2.msky130_fd_pr__pfet_01v8[vth]
+ @M.X2.XM2.msky130_fd_pr__pfet_01v8[vgs] @M.X2.XM2.msky130_fd_pr__pfet_01v8[vds] @M.X2.XM2.msky130_fd_pr__pfet_01v8[vdsat]
+ @M.X2.XM2.msky130_fd_pr__pfet_01v8[gm] @M.X2.XM2.msky130_fd_pr__pfet_01v8[gds] @M.X2.XM1.msky130_fd_pr__nfet_01v8[cgs]
+ @M.X2.XM1.msky130_fd_pr__nfet_01v8[cgd]  @M.XM6.msky130_fd_pr__nfet_01v8[id] @M.XM6.msky130_fd_pr__nfet_01v8[vth]
+ @M.XM6.msky130_fd_pr__nfet_01v8[vgs] @M.XM6.msky130_fd_pr__nfet_01v8[vds] @M.XM6.msky130_fd_pr__nfet_01v8[vdsat]
+ @M.XM6.msky130_fd_pr__nfet_01v8[gm] @M.XM6.msky130_fd_pr__nfet_01v8[gds] @M.XM6.msky130_fd_pr__nfet_01v8[cgs]
+ @M.XM6.msky130_fd_pr__nfet_01v8[cgd]  @M.XM5.msky130_fd_pr__pfet_01v8[id] @M.XM5.msky130_fd_pr__pfet_01v8[vth]
+ @M.XM5.msky130_fd_pr__pfet_01v8[vgs] @M.XM5.msky130_fd_pr__pfet_01v8[vds] @M.XM5.msky130_fd_pr__pfet_01v8[vdsat]
+ @M.XM5.msky130_fd_pr__pfet_01v8[gm] @M.XM5.msky130_fd_pr__pfet_01v8[gds] @M.XM5.msky130_fd_pr__nfet_01v8[cgs]
+ @M.XM5.msky130_fd_pr__nfet_01v8[cgd]



*Simulations
.control
  tran 0.05n 1u
  setplot tran1
  plot v(out) v(outx32)+2 v(outx16)+4 v(outx8)+6 v(outx4)+8 v(outx2)+10 v(out_vco)+12 v(en)+14

  linearize
  set specwindow=blackman
  fft v(out_vco)
  spec 10 1000000 1000 v(out_vco)
  plot mag(v(out_vco))

  reset
  tran 0.05n 1u
  setplot tran2
  linearize
  fft v(out)
  spec 10 1000000 1000 v(out)
  plot mag(v(out))
  write ~/caravel_fulgor_opamp/xschem/ring_vco/sim_results/ring_vco_tran1.raw


.endc

.end


**** end user architecture code
**.ends

* expanding   symbol:  not.sym # of pins=5

.subckt not  vdd in out vss vbulk
*.ipin vdd
*.ipin in
*.ipin vss
*.opin out
*.ipin vbulk
XM1 out in vss vbulk sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM2 out in vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
.ends


* expanding   symbol:  FD_v2.sym # of pins=4

.subckt FD_v2  clk vss out vdd
*.opin out
*.ipin vdd
*.ipin clk
*.ipin vss
XM1 1 4 vss vss sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM2 1 4 vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM3 1 clk 2 vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM4 1 clk_b 2 vss sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM5 3 2 vss vss sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM6 3 2 vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM7 3 clk_b out vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM8 3 clk out vss sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM9 4 out vss vss sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM10 4 out vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM11 clk_b clk vss vss sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM12 clk_b clk vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
.ends


* expanding   symbol:  nand.sym # of pins=6

.subckt nand  vdd A OUT B vss vbulk
*.opin OUT
*.ipin vdd
*.ipin A
*.ipin B
*.ipin vss
*.ipin vbulk
XM1 net1 B vss vbulk sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM2 OUT A net1 vbulk sky130_fd_pr__nfet_01v8 W=0.45 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM5 OUT A vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
XM6 OUT B vdd vdd sky130_fd_pr__pfet_01v8 W=0.9 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=1 m=1 
.ends

.GLOBAL GND
.end