| **.subckt sawgen-bjt |
| C1 saw GND .1n m=1 |
| Q1 saw vcur net2 2N3906 area=1 m=1 |
| V1 VDD GND 10 |
| R1 VDD vcur 1k m=1 |
| R2 vcur GND 5k m=1 |
| Q2 vt net1 GND 2N3904 area=1 m=1 |
| Q3 net1 vt saw 2N3906 area=1 m=1 |
| R3 vt GND 100 m=1 |
| R4 VDD vt 100 m=1 |
| R5 VDD net2 100k m=1 |
| **** begin user architecture code |
| |
| |
| * |
| .model 2N3904 NPN(IS=1E-14 VAF=100 Bf=300 IKF=0.4 XTB=1.5 BR=4 CJC=4E-12 CJE=8E-12 RB=20 RC=0.1 |
| + RE=0.1 TR=250E-9 TF=350E-12 ITF=1 VTF=2 XTF=3 Vceo=40 Icrating=200m mfg=Philips) |
| |
| .model 2N3906 PNP(IS=1E-14 VAF=100 BF=200 IKF=0.4 XTB=1.5 BR=4 CJC=4.5E-12 CJE=10E-12 RB=20 |
| + RC=0.1 RE=0.1 TR=250E-9 TF=350E-12 ITF=1 VTF=2 XTF=3 Vceo=40 Icrating=200m mfg=Philips) |
| |
| .OPTION ABSTOL=1e-15. |
| .OPTION GMIN=1.0e-12. |
| .OPTION ITL1=1e5 |
| .OPTION RSHUNT=1e12 |
| .OPTION RELTOL=1e-5 |
| .OPTION METHOD=gear |
| //.lib /usr/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt |
| //.include /usr/share/pdk/sky130A/libs.ref/sky130_fd_sc_hvl/spice/sky130_fd_sc_hvl.spice |
| |
| |
| .ic V(saw)=0 |
| .control |
| tran 1n 200u |
| plot V(saw) V(vcur) V(Vt) |
| .endc |
| |
| **** end user architecture code |
| **.ends |
| .GLOBAL GND |
| .GLOBAL VDD |
| ** flattened .save nodes |
| .end |
