| v {xschem version=3.0.0 file_version=1.2 |
| |
| * Copyright 2021 Stefan Frederik Schippers |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| |
| } |
| G {} |
| K {} |
| V {} |
| S {} |
| E {} |
| B 2 820 -460 1280 -220 {flags=graph |
| y1 = -2e-18 |
| y2 = 1.8 |
| divy = 5 |
| x1=0 |
| x2=0.00015 |
| divx=5 |
| node="vbg en_n start" |
| color="4 5 9" subdivx=4 unitx=u} |
| B 2 820 -600 1280 -470 {flags=graph |
| y1 = 0.997821 |
| y2 = 1.36482 |
| divy = 5 |
| subdivy=1 |
| x1=0 |
| x2=0.00015 |
| divx=4 |
| subdivx=4 |
| node="vbg" |
| color="4 5" unitx=u} |
| B 2 820 -740 1280 -610 {flags=graph |
| y1 = 1.14304 |
| y2 = 1.18664 |
| divy = 5 |
| subdivy=1 |
| x1=0 |
| x2=0.00015 |
| divx=4 |
| subdivx=4 |
| node="vbg" |
| color="4 5" unitx=u} |
| B 2 820 -880 1280 -750 {flags=graph |
| y1 = -4.36801e-05 |
| y2 = -1.68365e-05 |
| divy = 5 |
| unity=u |
| subdivy=1 |
| x1=0 |
| x2=0.00015 |
| divx=4 |
| subdivx=4 |
| node="i(v2)" |
| color="4 5" unitx=u} |
| T {Example of Mismatch simulation of a |
| bandgap reference. |
| Variations are generated also on Vcc |
| |
| Plot shows bandgap varying outputs before |
| and after the offset cancellation. |
| } 230 -880 0 0 0.4 0.4 {} |
| T {Select one or more graphs (and no other objects) |
| and use arrow keys to zoom / pan waveforms} 250 -610 0 0 0.3 0.3 {} |
| N 240 -340 240 -320 { lab=EN_N} |
| N 650 -340 650 -320 { lab=VCC} |
| N 390 -340 390 -320 { lab=VSS} |
| N 240 -220 240 -200 {lab=TEMPERAT} |
| N 390 -220 390 -200 { lab=START} |
| N 650 -220 650 -200 { lab=CLK} |
| C {devices/code.sym} 10 -450 0 0 {name=NGSPICE |
| only_toplevel=true |
| value=" |
| * this experimental option enables mos model bin |
| * selection based on W/NF instead of W |
| .options wnflag=1 XMU=0.49 METHOD=GEAR ITL4=100 CHGTOL=1e-15 TRTOL=1 RELTOL=0.0001 VNTOL=0.1u |
| .param ABSVAR=0.03 |
| .param VCCGAUSS=agauss(1.8, 'ABSVAR', 1) |
| .param VCC=VCCGAUSS |
| * .param VCC=1.8 |
| ** variation marameters: |
| * .options savecurrents |
| .control |
| option seed=12 |
| let run=1 |
| dowhile run <= 14 |
| if run > 1 |
| reset |
| set appendwrite |
| end |
| * save vbg x1.plus x1.minus i(v2) vcc |
| save all |
| if run % 3 = 0 |
| set temp=-40 |
| end |
| if run % 3 = 1 |
| set temp=27 |
| end |
| if run % 3 = 2 |
| set temp=125 |
| end |
| tran 0.05u 150u |
| write tb_bandgap.raw |
| let run = run + 1 |
| end |
| set nolegend |
| plot all.vbg |
| .endc |
| " } |
| C {devices/title.sym} 160 -30 0 0 {name=l1 author="Stefan Schippers"} |
| C {sky130_tests/bandgap.sym} 410 -490 0 0 {name=x1} |
| C {devices/lab_pin.sym} 560 -530 0 1 {name=p1 lab=VBG} |
| C {devices/lab_pin.sym} 260 -490 0 0 {name=p2 lab=EN_N} |
| C {devices/vsource.sym} 240 -290 0 0 {name=V1 value=0} |
| C {devices/lab_pin.sym} 240 -340 0 1 {name=p3 lab=EN_N} |
| C {devices/vsource.sym} 650 -290 0 0 {name=V2 value="pwl 0 0 1u 0 4u VCC"} |
| C {devices/lab_pin.sym} 650 -340 0 1 {name=l29 sig_type=std_logic lab=VCC} |
| C {devices/lab_pin.sym} 260 -470 0 0 {name=p4 lab=VCC} |
| C {devices/lab_pin.sym} 260 -450 0 0 {name=p5 lab=VSS} |
| C {devices/vsource.sym} 390 -290 0 0 {name=V3 value=0} |
| C {devices/lab_pin.sym} 390 -340 0 1 {name=l3 sig_type=std_logic lab=VSS} |
| C {devices/lab_pin.sym} 240 -260 0 0 {name=l2 sig_type=std_logic lab=VSS} |
| C {devices/lab_pin.sym} 650 -260 0 0 {name=l4 sig_type=std_logic lab=VSS} |
| C {devices/lab_pin.sym} 390 -260 0 0 {name=l5 sig_type=std_logic lab=0} |
| C {devices/launcher.sym} 200 -90 0 0 {name=h2 |
| descr="Simulate" |
| tclcommand="xschem netlist; xschem simulate"} |
| C {devices/vsource_arith.sym} 240 -170 0 0 {name=E5 VOL=temper MAX=200 MIN=-200} |
| C {devices/lab_pin.sym} 240 -220 0 1 {name=p113 lab=TEMPERAT} |
| C {devices/lab_pin.sym} 240 -140 0 0 {name=p114 lab=VSS} |
| C {devices/vsource.sym} 390 -170 0 0 {name=V4 value="pwl 0 VCC 25u VCC 25.001u 0"} |
| C {devices/lab_pin.sym} 390 -220 0 1 {name=p7 lab=START} |
| C {devices/lab_pin.sym} 390 -140 0 0 {name=l21 sig_type=std_logic lab=VSS} |
| C {devices/vsource.sym} 650 -170 0 0 {name=V5 |
| value1="dc 0 " |
| value="dc 0 pulse |
| + VCC 0 |
| + 25u |
| + 1n 1n |
| + 27000n 30000n" |
| } |
| C {devices/lab_pin.sym} 650 -140 0 0 {name=l6 sig_type=std_logic lab=VSS} |
| C {devices/lab_pin.sym} 650 -220 0 1 {name=p6 lab=CLK} |
| C {devices/lab_pin.sym} 260 -530 0 0 {name=p8 lab=START} |
| C {devices/lab_pin.sym} 260 -510 0 0 {name=p9 lab=CLK} |
| C {devices/code.sym} 10 -250 0 0 {name=TT_MODELS |
| only_toplevel=true |
| format="tcleval( @value )" |
| value=" |
| ** opencircuitdesign pdks install |
| .lib $::SKYWATER_MODELS/sky130.lib.spice tt_mm |
| |
| " |
| spice_ignore=false} |
| C {devices/launcher.sym} 235 -665 0 0 {name=h1 |
| descr="Select arrow and |
| Ctrl-Left-Click to load/unload waveforms" |
| tclcommand=" |
| xschem raw_read $netlist_dir/[file tail [file rootname [xschem get current_name]]].raw |
| " |
| } |
