add cad files
* inverter top level * PMOS instance * NMOS instance
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7 changed files with 290 additions and 88 deletions
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fullcustom/cad/gds/.gitkeep
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fullcustom/cad/gds/.gitkeep
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fullcustom/cad/mag/inverter.mag
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fullcustom/cad/mag/inverter.mag
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@ -0,0 +1,27 @@
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magic
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tech sky130A
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magscale 1 2
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timestamp 1681238406
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<< metal1 >>
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rect 12 149 74 330
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rect 112 -202 170 62
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rect 12 -461 74 -280
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rect 208 -364 271 233
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use sky130_fd_pr__nfet_01v8_EDB9KC *sky130_fd_pr__nfet_01v8_EDB9KC_0
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timestamp 1681237416
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transform 1 0 141 0 1 -322
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box -211 -252 211 252
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use sky130_fd_pr__pfet_01v8_M479BZ sky130_fd_pr__pfet_01v8_M479BZ_0
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timestamp 1681237537
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transform 1 0 141 0 1 191
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box -211 -261 211 261
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<< labels >>
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flabel metal1 12 149 74 330 0 FreeMono 160 90 0 0 VDD
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port 1 nsew
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flabel metal1 12 -461 74 -280 0 FreeMono 160 90 0 0 VSS
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port 2 nsew
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flabel metal1 112 -140 170 -34 0 FreeMono 160 0 0 0 I
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port 3 nsew
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flabel metal1 208 -140 271 -34 0 FreeMono 160 0 0 0 O
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port 4 nsew
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<< end >>
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fullcustom/cad/mag/sky130_fd_pr__nfet_01v8_EDB9KC.mag
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fullcustom/cad/mag/sky130_fd_pr__nfet_01v8_EDB9KC.mag
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magic
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tech sky130A
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magscale 1 2
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timestamp 1681237416
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<< error_p >>
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<< pwell >>
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<< nmos >>
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<< ndiff >>
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<< metal1 >>
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<< properties >>
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string FIXED_BBOX -158 -199 158 199
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string gencell sky130_fd_pr__nfet_01v8
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string library sky130
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string parameters w 0.420 l 0.150 m 1 nf 1 diffcov 100 polycov 100 guard 1 glc 1 grc 1 gtc 1 gbc 1 tbcov 100 rlcov 100 topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.15 wmin 0.42 compatible {sky130_fd_pr__nfet_01v8 sky130_fd_pr__nfet_01v8_lvt sky130_fd_bs_flash__special_sonosfet_star sky130_fd_pr__nfet_g5v0d10v5 sky130_fd_pr__nfet_05v0_nvt sky130_fd_pr__nfet_03v3_nvt} full_metal 1 viasrc 100 viadrn 100 viagate 100 viagb 0 viagr 0 viagl 0 viagt 0
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<< end >>
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fullcustom/cad/mag/sky130_fd_pr__pfet_01v8_M479BZ.mag
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fullcustom/cad/mag/sky130_fd_pr__pfet_01v8_M479BZ.mag
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@ -0,0 +1,82 @@
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magic
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tech sky130A
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magscale 1 2
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timestamp 1681237537
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<< error_p >>
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rect -29 -89 29 -83
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rect -29 -123 -17 -89
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rect -29 -129 29 -123
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<< pmos >>
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<< viali >>
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rect -61 -30 -27 30
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rect 27 -30 61 30
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rect -17 -123 17 -89
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<< metal1 >>
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rect -67 30 -21 42
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rect -29 -123 -17 -89
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rect 17 -123 29 -89
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rect -29 -129 29 -123
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<< properties >>
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string FIXED_BBOX -158 -208 158 208
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string gencell sky130_fd_pr__pfet_01v8
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string library sky130
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string parameters w 0.42 l 0.15 m 1 nf 1 diffcov 100 polycov 100 guard 1 glc 1 grc 1 gtc 1 gbc 1 tbcov 100 rlcov 100 topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.15 wmin 0.42 compatible {sky130_fd_pr__pfet_01v8 sky130_fd_pr__pfet_01v8_lvt sky130_fd_pr__pfet_01v8_hvt sky130_fd_pr__pfet_g5v0d10v5} full_metal 1 viasrc 100 viadrn 100 viagate 100 viagb 0 viagr 0 viagl 0 viagt 0
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<< end >>
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0
fullcustom/cad/spice/.gitkeep
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fullcustom/cad/spice/.gitkeep
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fullcustom/cad/svg/.gitkeep
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fullcustom/cad/svg/.gitkeep
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@ -6,14 +6,9 @@
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"id": "9quLG8jhYqwq"
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},
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"source": [
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"# Fullcustom analog design demo using Magic"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"The environment path must be retrieved in order to provide _Magic_ with the technology files."
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"# Fullcustom analog design demo using Magic\n",
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"\n",
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"The environment path must be retrieved in order to provide _Magic_ with the technology files:"
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]
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},
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{
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@ -28,22 +23,17 @@
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"CONDA_PREFIX = os.environ['CONDA_PREFIX']"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "CQdALyHZ9Z01"
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},
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"source": [
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"## Sources"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Graphic Design System file (GDS)\n",
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"## Source files\n",
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"\n",
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"A GDS file is drawn by hand:"
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"### Using the _Magic_ VLSI layout tool\n",
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"\n",
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"[_Magic_](http://opencircuitdesign.com/magic/) cells (`.mag`) are used to store and manage the layouts. They can be edited using _Magic_ commands or using _Magic_'s GUI.\n",
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"\n",
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"An existing _inverter_ design as well as its dependencies is imported and converted to _Graphic Design System_ (`.gds`) file for viewing and manufacturing and a _SPICE_ (`.spice`) file for simulation:"
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]
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},
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{
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@ -54,47 +44,32 @@
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"base_uri": "https://localhost:8080/"
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},
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"id": "hhpUJrMBmlfj",
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"outputId": "bb1109ea-5d45-4a35-e81e-5f0fca3bea9f"
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"outputId": "bb1109ea-5d45-4a35-e81e-5f0fca3bea9f",
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"scrolled": true
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},
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"outputs": [],
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"source": [
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"%%script magic -dnull -noconsole -rcfile {CONDA_PREFIX}/share/pdk/sky130A/libs.tech/magic/sky130A.magicrc\n",
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"cellname rename (UNNAMED) mosfet\n",
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"\n",
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"box 0 0 950nm 650nm\n",
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"paint ndiffusion\n",
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"\n",
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"box 400nm -600nm 550nm 1200nm\n",
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"paint polysilicon\n",
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"\n",
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"box 0 0 400nm 650nm\n",
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"label source\n",
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"port make 3\n",
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"\n",
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"box 550nm 0 950nm 650nm\n",
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"label drain\n",
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"port make 1\n",
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"\n",
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"box 400nm -600nm 550nm 0\n",
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"label gate\n",
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"port make 2\n",
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"load cad/mag/inverter.mag\n",
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"\n",
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"extract\n",
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"ext2spice lvs\n",
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"ext2spice cthresh 0\n",
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"ext2spice\n",
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"ext2spice rthresh 0\n",
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"ext2spice -o cad/spice/inverter.spice\n",
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"\n",
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"gds labels no\n",
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"gds write mosfet.gds"
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"gds write cad/gds/inverter.gds"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Display layout\n",
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"### Display the inverter layout\n",
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"\n",
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"The implemented layout can be retrieved as follows:"
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"The `.gds` file can be converted to vector graphics for displaying:"
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]
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},
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{
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@ -113,33 +88,21 @@
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"import gdstk\n",
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"import IPython.display\n",
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"\n",
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"library = gdstk.read_gds('mosfet.gds')\n",
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"library = gdstk.read_gds('cad/gds/inverter.gds')\n",
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"top_cells = library.top_level()\n",
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"top_cells[0].write_svg('mosfet.svg', scaling=200)\n",
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"IPython.display.SVG('mosfet.svg')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "YZdXQnCJ9h_o"
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},
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"source": [
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"## Simulation"
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"top_cells[0].write_svg('cad/svg/inverter.svg', scaling=100)\n",
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"IPython.display.SVG('cad/svg/inverter.svg')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### PySPICE"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"_PySPICE_ is used for analog simulation of the circuit."
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"## Simulation\n",
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"\n",
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"### Using _SPICE_ simulation engine\n",
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"\n",
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"[_PySPICE_](https://pyspice.fabrice-salvaire.fr/releases/v1.4/overview.html) is a _Python_ implementation of several _SPICE_ simulation engines. The _SPICE_ engines are used to simulate analog circuits. A top-level test bench circuit must be built:"
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]
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},
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{
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@ -157,34 +120,38 @@
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"source": [
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"from PySpice.Spice.Netlist import Circuit, SubCircuit, SubCircuitFactory\n",
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"from PySpice.Unit import *\n",
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"import matplotlib.pyplot as plt\n",
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"\n",
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"circuit = Circuit('mosfet0')\n",
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"# Declare the top-level circuit\n",
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"circuit = Circuit('Inverter')\n",
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"# Link to technology libraries\n",
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"circuit.lib(f'{CONDA_PREFIX}/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice', 'tt')\n",
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"circuit.include('mosfet.spice')\n",
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"circuit.X('mosfet0', 'mosfet', 'DRAIN', 'GATE', 'VGND')\n",
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"circuit.V('gnd', 'VGND', 0, 0)\n",
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"circuit.V('dd', 'VPWR', 'VGND', 1.8)\n",
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"circuit.R('', 'VPWR', 'DRAIN', '10k')\n",
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"circuit.PulseVoltageSource('Vin', 'GATE', 'VGND',\n",
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"\n",
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"# Import and instantiate the CUT (Circuit Under Test)\n",
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"circuit.include('cad/spice/inverter.spice')\n",
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"circuit.X('Inverter', 'inverter', 'VDD','VSS','I','O');\n",
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"\n",
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"# Add voltage sources\n",
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"circuit.V('VSS', 'VSS', 0, 0)\n",
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"circuit.V('VDD', 'VDD', 'VSS', 1.8)\n",
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"# Add pulse source\n",
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"circuit.PulseVoltageSource(\n",
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" 'I', 'I', 'VSS',\n",
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" initial_value=0@u_V, pulsed_value=1.8@u_V,\n",
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" rise_time=10@u_ps, fall_time=10@u_ps,\n",
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" pulse_width=1@u_ns, period=2@u_ns, delay_time=1@u_ns)\n",
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" pulse_width=40@u_ps, period=160@u_ps, delay_time=10@u_ps\n",
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")\n",
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"\n",
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"# Create the simulation and simulate\n",
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"simulator = circuit.simulator()\n",
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"analysis = simulator.transient(step_time=10@u_ps, end_time=2@u_ns)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Plot the waveform"
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"analysis = simulator.transient(step_time=1@u_ps, end_time=160@u_ps)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Plot the waveform\n",
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"\n",
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"The output waveform can be plotted:"
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]
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},
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@ -196,22 +163,66 @@
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},
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"outputs": [],
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"source": [
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"fig, ax = plt.subplots(figsize=(20, 10))\n",
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"ax.set_title('mosfet')\n",
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"ax.set_xlabel('time in 1e-14s')\n",
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"ax.set_ylabel('voltage in V')\n",
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"ax.plot(analysis.GATE)\n",
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"ax.plot(analysis.DRAIN)\n",
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"ax.legend(('GATE', 'DRAIN'))\n",
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"import matplotlib.pyplot as plt\n",
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"import numpy as np\n",
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"fig, ax = plt.subplots(figsize=(8,5))\n",
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"ax.grid(visible=True, which='major', axis='both');\n",
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"ax.grid(visible=True, which='minor', axis='both', linestyle=\"--\");\n",
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"ax.set_yticks(np.linspace(-1.0,2.5,8,endpoint=True));\n",
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"ax.set_yticks(np.linspace(-1.0,2.5,36,endpoint=True),minor=True);\n",
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"ax.set_xticks(np.linspace(0e-12,160e-12,9,endpoint=True));\n",
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"ax.set_xticks(np.linspace(0e-12,160e-12,17,endpoint=True),minor=True);\n",
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"ax.set_title('Inverter - Transient Simulation')\n",
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"ax.set_xlabel('Time [s]')\n",
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||||
"ax.set_ylabel('Signal [V]')\n",
|
||||
"ax.plot(analysis.time,analysis.I)\n",
|
||||
"ax.plot(analysis.time,analysis.O)\n",
|
||||
"ax.legend(('Input (I)', 'Output (O)'))\n",
|
||||
"plt.tight_layout()\n",
|
||||
"plt.show()"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Graphical editor\n",
|
||||
"\n",
|
||||
"_Magic_ can be started specifying only one file (`.magicrc`) that sets everything up (layers, macros, DRC rules, etc.)! Both a console and a GUI are started. Some functions are only accessible using the command-line interface or using keybindings."
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": null,
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"!magic -rcfile {CONDA_PREFIX}/share/pdk/sky130A/libs.tech/magic/sky130A.magicrc"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"# To have fun going further...\n",
|
||||
"\n",
|
||||
"Here are a couple ideas to spend a good time exploring those beautiful pieces of software:\n",
|
||||
"\n",
|
||||
" * Characterize an NMOS device or a PMOS device by applying voltage pulses on the different pads.\n",
|
||||
" * Start _Magic_ on another PDK and design another inverter.\n",
|
||||
" * Vary the devices' geometry; try to make the pull-up and the pull-down waveforms symmetrical.\n",
|
||||
" \n",
|
||||
" **Do not hesitate to open the `.mag` files to see how they are built and to adapt from them!**\n",
|
||||
" \n",
|
||||
" > Good luck and read the docs. 😉"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"# References\n",
|
||||
"\n",
|
||||
"Inspired from:\n",
|
||||
"“Silicon Notebooks.” CHIPS Alliance, Apr. 08, 2023. Accessed: Apr. 10, 2023. [Online]. Available: https://github.com/chipsalliance/silicon-notebooks/blob/b65134a43b01ae31423f7ee87110740b2257ac42/analog-inverter-magic.ipynb (Apache License 2.0)"
|
||||
]
|
||||
|
|
|
|||
Loading…
Reference in a new issue