xschem/zero_opamp.spice

**.subckt zero_opamp PLUS MINUS EN_N VSS VCC DIFFOUT ADJ
*.ipin PLUS
*.ipin MINUS
*.ipin EN_N
*.ipin VSS
*.ipin VCC
*.opin DIFFOUT
*.ipin ADJ
C6 G1 0 2f m=1
XM4 net6 EN_N VCC VCC sky130_fd_pr__pfet_01v8 L=8 W=2 nf=1 ad='W * 0.29' as='W * 0.29' pd='W + 2 * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM18 G2 G2 VSS VSS sky130_fd_pr__nfet_01v8_lvt L=4 W=2 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM2 G1 G1 VSS VSS sky130_fd_pr__nfet_01v8_lvt L=4 W=2 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM20 G2 PLUS net7 VCC sky130_fd_pr__pfet_01v8_lvt L=1 W=4 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM6 G1 MINUS net8 VCC sky130_fd_pr__pfet_01v8_lvt L=1 W=4 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
v1 SP net8 0
C4 SP 0 2f m=1
C1 G2 0 2f m=1
C5 DIFFOUT 0 4f m=1
XM11 DIFFOUT G2 net1 VSS sky130_fd_pr__nfet_01v8_lvt L=4 W=2 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
v2 SP net7 0
v4 net1 VSS 0
v6 net6 SP 0
XM7 DIFFOUT EN_N VSS VSS sky130_fd_pr__nfet_01v8 L=0.15 W=0.5 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=3 m=3 
XM46 net9 EN_N VCC VCC sky130_fd_pr__pfet_01v8 L=0.15 W=5 nf=1 ad='W * 0.29' as='W * 0.29' pd='W + 2 * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
v17 net9 net3 0
XM53 net2 G1 VSS VSS sky130_fd_pr__nfet_01v8_lvt L=4 W=2 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM54 net2 net2 net3 VCC sky130_fd_pr__pfet_01v8_lvt L=4 W=4 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM55 DIFFOUT net2 net3 VCC sky130_fd_pr__pfet_01v8_lvt L=4 W=4 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM8 G1 ADJ net4 VCC sky130_fd_pr__pfet_01v8_lvt L=1 W=1 nf=1 ad='W * 0.29' as='W * 0.29' pd='W + 2 * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM9 G1 ADJ net5 VSS sky130_fd_pr__nfet_01v8_lvt L=1 W=0.5 nf=1 ad='W * 0.29' as='W * 0.29' pd='W + 2 * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM10 net5 VCC VSS VSS sky130_fd_pr__nfet_01v8_lvt L=8 W=0.5 nf=1 ad='W * 0.29' as='W * 0.29' pd='2*(W + 0.29)'
+ ps='2*(W + 0.29)' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
XM1 net4 EN_N VCC VCC sky130_fd_pr__pfet_01v8 L=8 W=1 nf=1 ad='W * 0.29' as='W * 0.29' pd='W + 2 * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 mult=1 m=1 
**** begin user architecture code

.lib /ef/tech/SW.2/sky130A/libs.tech/ngspice/sky130.lib.spice tt
* Mismatch parameters
* Resistor/ef/tech/SW.2/sky130A/libs.tech/ngspice/Capacitor
* Special cells
* All models
* Corner

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

* .option SCALE=1e-6
.option method=gear seed=12

* this experimental option enables mos model bin
* selection based on W/NF instead of W
.option wnflag=1

.param VCC=1.8
* .param VCCGAUSS=agauss(1.8, 0.05, 1)
* .param VCC=VCCGAUSS
.param VDL=0.7
.param ABSVAR=0.02
.temp 25

** to generate following file:
** copy .../xschem_sky130/sky130_tests/stimuli.test_comparator to simulation directory
** then do 'Simulation->Utile Stimuli Editor (GUI)' and press 'Translate'
.include "stimuli_bandgap_opamp.cir"

** variation marameters:
* .param sky130_fd_pr__nfet_01v8_lvt__vth0_slope_spectre='agauss(0, ABSVAR, 3)/sky130_fd_pr__nfet_01v8_lvt__vth0_slope'
* .param sky130_fd_pr__pfet_01v8_lvt__vth0_slope_spectre='agauss(0, ABSVAR, 3)/sky130_fd_pr__pfet_01v8_lvt__vth0_slope'

* .tran 0.1n 900n uic

.control
  let run=1
  dowhile run <= 1
    if run > 1
      reset
      set appendwrite
    end
    save all
    * save saout cal i(vvcc) en plus minus
    tran 1n 10000n uic
    plot saout
    plot plus minus
    write bandgap_opamp.raw
    let run = run + 1
  end
.endc


**** end user architecture code
** flattened .save nodes
.save I(v1)
.save I(v2)
.save I(v4)
.save I(v6)
.save I(v17)
.end