| *Model Description |
| .param temp=27 |
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| *Including sky130 library files |
| .lib "../sky130_fd_pr/models/sky130.lib.spice" tt |
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| .options wnflag=1 |
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| *Netlist Description |
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| **.subckt 8bitdac_tb |
| x1 x1_inp1 x1_inp2 x1_vdd 0 x1_d0 x1_d1 x1_out_v x1_d2 x1_d3 x1_d4 x1_d5 x1_d6 x1_d7 8bitdac |
| V1 x1_vdd 0 dc 3.3V |
| V2 x1_d0 0 PULSE 0 1.8 0 1p 1p 5u 10u |
| V3 x1_d1 0 PULSE 0 1.8 0 1p 1p 10u 20u |
| V4 x1_inp2 0 dc 0 |
| V5 x1_inp1 0 dc 3.3V |
| V6 x1_d2 0 PULSE 0 1.8 0 1p 1p 20u 40u |
| V7 x1_d3 0 PULSE 0 1.8 0 1p 1p 40u 80u |
| V8 x1_d4 0 PULSE 0 1.8 0 1p 1p 80u 160u |
| V9 x1_d5 0 PULSE 0 1.8 0 1p 1p 160u 320u |
| V10 x1_d6 0 PULSE 0 1.8 0 1p 1p 320u 640u |
| V11 x1_d7 0 PULSE 0 1.8 0 1p 1p 640u 1280u |
| C1 x1_out_v 0 100f |
| **.ends |
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| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/8bitdac.sym # of pins=13 |
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| .subckt 8bitdac inp1 inp2 vdd gnda d0 d1 out_v d2 d3 d4 d5 d6 d7 |
| *.ipin inp1 |
| *.ipin inp2 |
| *.iopin vdd |
| *.iopin gnda |
| *.ipin d0 |
| *.ipin d1 |
| *.opin out_v |
| *.ipin d2 |
| *.ipin d3 |
| *.ipin d4 |
| *.ipin d5 |
| *.ipin d6 |
| *.ipin d7 |
| R1 x1_vref5 x2_vref1 250 |
| x3 x1_out_v vdd out_v d7 gnda x2_out_v TG2 |
| x1 inp1 x1_vref5 vdd gnda d0 d1 x1_out_v d2 d3 d4 d5 d6 7bitdac |
| x2 x2_vref1 inp2 vdd gnda d0 d1 x2_out_v d2 d3 d4 d5 d6 7bitdac |
| .ends |
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| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/7bitdac.sym # of pins=12 |
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| .subckt 7bitdac inp1 inp2 vdd gnda d0 d1 out_v d2 d3 d4 d5 d6 |
| *.ipin inp1 |
| *.ipin inp2 |
| *.iopin vdd |
| *.iopin gnda |
| *.ipin d0 |
| *.ipin d1 |
| *.opin out_v |
| *.ipin d2 |
| *.ipin d3 |
| *.ipin d4 |
| *.ipin d5 |
| *.ipin d6 |
| R1 x1_vref5 x2_vref1 250 |
| x3 x1_out_v vdd out_v d6 gnda x2_out_v TG2 |
| x1 inp1 x1_vref5 vdd gnda d0 d1 x1_out_v d2 d3 d4 d5 6bitdac |
| x2 x2_vref1 inp2 vdd gnda d0 d1 x2_out_v d2 d3 d4 d5 6bitdac |
| .ends |
| |
| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/6bitdac.sym # of pins=11 |
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| .subckt 6bitdac inp1 inp2 vdd gnda d0 d1 out_v d2 d3 d4 d5 |
| *.ipin inp1 |
| *.ipin inp2 |
| *.iopin vdd |
| *.iopin gnda |
| *.ipin d0 |
| *.ipin d1 |
| *.opin out_v |
| *.ipin d2 |
| *.ipin d3 |
| *.ipin d4 |
| *.ipin d5 |
| R1 x1_vref5 x2_vref1 250 |
| x3 x1_out_v vdd out_v d5 gnda x2_out_v TG2 |
| x1 inp1 x1_vref5 vdd gnda d0 d4 d1 x1_out_v d2 d3 5bitdac |
| x2 x2_vref1 inp2 vdd gnda d0 d4 d1 x2_out_v d2 d3 5bitdac |
| .ends |
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| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/5bitdac.sym # of pins=10 |
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| .subckt 5bitdac inp1 inp2 vdd gnda d0 d4 d1 out_v d2 d3 |
| *.ipin inp1 |
| *.ipin inp2 |
| *.iopin vdd |
| *.iopin gnda |
| *.ipin d0 |
| *.ipin d4 |
| *.ipin d1 |
| *.opin out_v |
| *.ipin d2 |
| *.ipin d3 |
| R1 x1_vref5 x2_vref1 250 |
| x3 x1_out_v vdd out_v d4 gnda x2_out_v TG2 |
| x1 inp1 x1_vref5 vdd gnda d0 d3 d1 x1_out_v d2 4bitdac |
| x2 x2_vref1 inp2 vdd gnda d0 d3 d1 x2_out_v d2 4bitdac |
| .ends |
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| .subckt 4bitdac inp1 inp2 vdd gnda d0 d3 d1 out_v d2 |
| *.ipin inp1 |
| *.ipin inp2 |
| *.iopin vdd |
| *.iopin gnda |
| *.ipin d0 |
| *.ipin d3 |
| *.ipin d1 |
| *.opin out_v |
| *.ipin d2 |
| R1 x2_vref1 x1_vref5 250 |
| x3 x1_out_v vdd out_v d3 gnda x2_out_v TG2 |
| x1 inp1 x1_vref5 vdd gnda d0 d2 d1 x1_out_v 3bitdac |
| x2 x2_vref1 inp2 vdd gnda d0 d2 d1 x2_out_v 3bitdac |
| .ends |
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| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/3bitdac.sym # of pins=8 |
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| .subckt 3bitdac inp1 inp2 vdd gnda d0 d2 d1 out_v |
| *.ipin inp1 |
| *.ipin inp2 |
| *.iopin vdd |
| *.iopin gnda |
| *.ipin d0 |
| *.ipin d2 |
| *.ipin d1 |
| *.opin out_v |
| R1 x1_vref5 x2_vref1 250 |
| x1 vdd inp1 gnda x1_out_v d1 d0 x1_vref5 2bitdac |
| x2 vdd x2_vref1 gnda x2_out_v d1 d0 inp2 2bitdac |
| x3 x1_out_v vdd out_v d2 gnda x2_out_v TG2 |
| .ends |
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| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/2bitdac.sym # of pins=7 |
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| .subckt 2bitdac vdd vref1 gnda out_v d1 d0 vref5 |
| *.ipin vref1 |
| *.ipin vref5 |
| *.ipin d0 |
| *.ipin d1 |
| *.iopin vdd |
| *.iopin gnda |
| *.opin out_v |
| x1 x1_inp1 vdd x1_vout d0 gnda x1_inp2 TG2 |
| x2 x2_inp1 vdd x2_vout d0 gnda vref5 TG2 |
| x3 x1_vout vdd out_v d1 gnda x2_vout TG2 |
| R1 x1_inp1 vref1 500 |
| R2 x1_inp2 x1_inp1 500 |
| R3 x2_inp1 x1_inp2 500 |
| R4 vref5 x2_inp1 250 |
| .ends |
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| * expanding symbol: /home/harshitha/Desktop/xschem/xschem_library/TG2.sym # of pins=6 |
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| .subckt TG2 inp1 vdd vout din 0 inp2 |
| *.ipin inp1 |
| *.ipin inp2 |
| *.opin vout |
| *.ipin din |
| *.iopin vdd |
| *.iopin gnda |
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| XM1 dinb din 0 0 sky130_fd_pr__nfet_01v8 L=0.15 W=0.6 |
| XM2 dinb din vdd vdd sky130_fd_pr__pfet_01v8 L=0.15 W=1.2 |
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| XM7 dd dinb 0 0 sky130_fd_pr__nfet_01v8 L=0.15 W=0.6 |
| XM8 dd dinb vdd vdd sky130_fd_pr__pfet_01v8 L=0.15 W=1.2 |
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| XM3 vout dinb inp2 inp2 sky130_fd_pr__nfet_01v8 L=0.15 W=0.6 |
| XM4 inp1 dd vout vout sky130_fd_pr__nfet_01v8 L=0.15 W=0.6 |
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| XM5 vout dinb inp1 inp1 sky130_fd_pr__pfet_01v8 L=0.15 W=1.2 |
| XM6 inp2 dd vout vout sky130_fd_pr__pfet_01v8 L=0.15 W=1.2 |
| .ends |
| |
| .tran 2u 1280u |
| .control |
| run |
| plot x1_d0 x1_d1 x1_d2 x1_d3 x1_d4 x1_d5 x1_d6 x1_d7 |
| plot x1_out_v |
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| .endc |
| .end |
