**.subckt OpampJulia_OpenLoop_rpad
V1 vss GND DC{vss} 
V2 vdd vss DC{vdd} 
V3 vcm vss DC{vcm} 
V4 vsen vcm sin(0 {vac} 1Meg) dc 0 ac 1 
C4 vsen vin 1 m=1
I0 net1 vss DC{iref} 
R1 ve vcm 500 m=1
R2 vin ve 1G m=1
R3 vout ve 5k m=1
C5 vin vss 5p m=1
C1 vout vss 20p m=1
x1 vdd net1 net3 vcm net2 vss opamp
R4 net3 vin 150 m=1
R5 vout net2 150 m=1
**** begin user architecture code


* Circuit Parameters
.param iref = 100u
.param vdd  = 1.8
.param vss  = 0.0
.param vcm  = 0.8
.param vac  = 10m
.options TEMP = 65.0

* Include Models
*.lib /home/jalvarez/skywater-pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/corners/sky130.lib SS
*.lib  ~/fulgor-opamp-sky130/xschem/sky130.lib TT
*.lib ~/skywater_pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/corners/sky130.lib TT
.lib /home/jalvarez/skywater_pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/corners
.include /home/jalvarez/skywater_pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/corners/tt.spice

* OP Parameters & Singals to save
.save all  @M.X1.XM1.msky130_fd_pr__pfet_01v8[id] @M.X1.XM1.msky130_fd_pr__pfet_01v8[vth]
+ @M.X1.XM1.msky130_fd_pr__pfet_01v8[vgs] @M.X1.XM1.msky130_fd_pr__pfet_01v8[vds] @M.X1.XM1.msky130_fd_pr__pfet_01v8[vdsat]
+ @M.X1.XM1.msky130_fd_pr__pfet_01v8[gm] @M.X1.XM1.msky130_fd_pr__pfet_01v8[gds]  @M.X1.XM2.msky130_fd_pr__pfet_01v8[id]
+ @M.X1.XM2.msky130_fd_pr__pfet_01v8[vth] @M.X1.XM2.msky130_fd_pr__pfet_01v8[vgs] @M.X1.XM2.msky130_fd_pr__pfet_01v8[vds]
+ @M.X1.XM2.msky130_fd_pr__pfet_01v8[vdsat] @M.X1.XM2.msky130_fd_pr__pfet_01v8[gm] @M.X1.XM2.msky130_fd_pr__pfet_01v8[gds]
+  @M.X1.XM3.msky130_fd_pr__nfet_01v8[id] @M.X1.XM3.msky130_fd_pr__nfet_01v8[vth] @M.X1.XM3.msky130_fd_pr__nfet_01v8[vgs]
+ @M.X1.XM3.msky130_fd_pr__nfet_01v8[vds] @M.X1.XM3.msky130_fd_pr__nfet_01v8[vdsat] @M.X1.XM3.msky130_fd_pr__nfet_01v8[gm]
+ @M.X1.XM3.msky130_fd_pr__nfet_01v8[gds]  @M.X1.XM4.msky130_fd_pr__nfet_01v8[id] @M.X1.XM4.msky130_fd_pr__nfet_01v8[vth]
+ @M.X1.XM4.msky130_fd_pr__nfet_01v8[vgs] @M.X1.XM4.msky130_fd_pr__nfet_01v8[vds] @M.X1.XM4.msky130_fd_pr__nfet_01v8[vdsat]
+ @M.X1.XM4.msky130_fd_pr__nfet_01v8[gm] @M.X1.XM4.msky130_fd_pr__nfet_01v8[gds]  @M.X1.XM5.msky130_fd_pr__pfet_01v8[id]
+ @M.X1.XM5.msky130_fd_pr__pfet_01v8[vth] @M.X1.XM5.msky130_fd_pr__pfet_01v8[vgs] @M.X1.XM5.msky130_fd_pr__pfet_01v8[vds]
+ @M.X1.XM5.msky130_fd_pr__pfet_01v8[vdsat] @M.X1.XM5.msky130_fd_pr__pfet_01v8[gm] @M.X1.XM5.msky130_fd_pr__pfet_01v8[gds]
+  @M.X1.XM6.msky130_fd_pr__nfet_01v8[id] @M.X1.XM6.msky130_fd_pr__nfet_01v8[vth] @M.X1.XM6.msky130_fd_pr__nfet_01v8[vgs]
+ @M.X1.XM6.msky130_fd_pr__nfet_01v8[vds] @M.X1.XM6.msky130_fd_pr__nfet_01v8[vdsat] @M.X1.XM6.msky130_fd_pr__nfet_01v8[gm]
+ @M.X1.XM6.msky130_fd_pr__nfet_01v8[gds]  @M.X1.XM7.msky130_fd_pr__pfet_01v8[id] @M.X1.XM7.msky130_fd_pr__pfet_01v8[vth]
+ @M.X1.XM7.msky130_fd_pr__pfet_01v8[vgs] @M.X1.XM7.msky130_fd_pr__pfet_01v8[vds] @M.X1.XM7.msky130_fd_pr__pfet_01v8[vdsat]
+ @M.X1.XM7.msky130_fd_pr__pfet_01v8[gm] @M.X1.XM7.msky130_fd_pr__pfet_01v8[gds]  @M.X1.XM8.msky130_fd_pr__pfet_01v8[id]
+ @M.X1.XM8.msky130_fd_pr__pfet_01v8[vth] @M.X1.XM8.msky130_fd_pr__pfet_01v8[vgs] @M.X1.XM8.msky130_fd_pr__pfet_01v8[vds]
+ @M.X1.XM8.msky130_fd_pr__pfet_01v8[vdsat] @M.X1.XM8.msky130_fd_pr__pfet_01v8[gm] @M.X1.XM8.msky130_fd_pr__pfet_01v8[gds]
+  @M.X1.XM9.msky130_fd_pr__nfet_01v8[id] @M.X1.XM9.msky130_fd_pr__nfet_01v8[vth] @M.X1.XM9.msky130_fd_pr__nfet_01v8[vgs]
+ @M.X1.XM9.msky130_fd_pr__nfet_01v8[vds] @M.X1.XM9.msky130_fd_pr__nfet_01v8[vdsat] @M.X1.XM9.msky130_fd_pr__nfet_01v8[gm]
+ @M.X1.XM9.msky130_fd_pr__nfet_01v8[gds]

*Simulation
.control

  ac dec 100 1 10G
  setplot ac1
  meas ac GBW when vdb(vout)=0
  meas ac DCG find vdb(vout) at=1
  meas ac PM find vp(vout) when vdb(vout)=0
  print PM*180/PI
  meas ac GM find vdb(vout) when vp(vout)=0
  plot vdb(vout) {vp(vout)*180/PI}
  *write ~/fulgor-opamp-sky130/xschem/opamp_julia/sim_results_julia/opamp_openloop_ac1.raw

  reset
  op
  setplot op1
  *write ~/fulgor-opamp-sky130/xschem/opamp_julia/sim_results_julia/opamp_openloop_op1.raw

.endc

.end


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

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

.subckt opamp  vdd iref vin_n vin_p vout vss
*.iopin vdd
*.iopin vss
*.ipin vin_n
*.ipin vin_p
*.ipin iref
*.opin vout
XM1 vbn vin_n vp vp sky130_fd_pr__pfet_01v8 W=6 L=0.6 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=180 m=180 
XM2 voe1 vin_p vp vp sky130_fd_pr__pfet_01v8 W=6 L=0.6 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=180 m=180 
XM3 vbn vbn vss vss sky130_fd_pr__nfet_01v8 W=6 L=0.6 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=20 m=20 
XM4 voe1 vbn vss vss sky130_fd_pr__nfet_01v8 W=6 L=0.6 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=20 m=20 
XM5 vp iref vdd vdd sky130_fd_pr__pfet_01v8 W=6 L=0.6 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=20 m=20 
XM7 vout iref vdd vdd sky130_fd_pr__pfet_01v8 W=6 L=0.6 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=180 m=180 
XM8 iref iref vdd vdd sky130_fd_pr__pfet_01v8 W=6 L=0.6 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=18 m=18 
XM9 net1 vdd voe1 vss sky130_fd_pr__nfet_01v8 W=1 L=0.6 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=24 m=24 
XC1 net1 vout sky130_fd_pr__cap_mim_m3_1 W=17.55 L=15 MF=6 m=6
XM6 vout voe1 vss vss sky130_fd_pr__nfet_01v8 W=6 L=0.6 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=120 m=120 
.ends

.GLOBAL GND
.end