add fullcustom part
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fullcustom/README.md
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fullcustom/README.md
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# Fullcustom analog design
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## Environment
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Make sure Anaconda is installed and that you are in the `freechips/fullcustom` directory. The fullcustom environment can be created, updated and activated using:
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```sh
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conda env create
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conda activate fullcustom
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conda update --all
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```
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## Notebook
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The notebook can be openend as follows:
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```sh
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jupyter notebook
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```
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fullcustom/environment.yml
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fullcustom/environment.yml
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name: fullcustom
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channels:
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- defaults
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dependencies:
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- python=3.7
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- pip=22.3.1
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- pip:
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- gdstk==0.9.37
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- conda-forge::notebook=5.7.11
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# Drawing
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- litex-hub::magic=8.3.389_0_g1d8fcca
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# Simulation
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- conda-forge::pyspice
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# Process Development Kits (PDKs)
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- litex-hub::open_pdks.sky130a=1.0.404_0_gbb4b48f
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#- litex-hub::open_pdks.gf180mcuc=1.0.404_0_gbb4b48f
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# Simulation
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- conda-forge::pyspice
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fullcustom/fullcustom-transistor.ipynb
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fullcustom/fullcustom-transistor.ipynb
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {
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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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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"id": "ghmpRJhL3ac3"
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},
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"outputs": [],
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"source": [
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"import os\n",
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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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"\n",
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"A GDS file is drawn by hand:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"colab": {
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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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},
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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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"\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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"\n",
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"gds labels no\n",
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"gds write mosfet.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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"\n",
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"The implemented layout can be retrieved as follows:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"colab": {
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"base_uri": "https://localhost:8080/",
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"height": 611
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},
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"id": "xjz3IYz55vu2",
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"outputId": "8b2b0d37-abc2-4446-a9b9-8dd4b8d7bfe7"
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},
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"outputs": [],
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"source": [
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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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"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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]
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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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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"colab": {
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"base_uri": "https://localhost:8080/",
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"height": 927
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},
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"id": "9scIFl1w7Lk6",
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"outputId": "47f12782-4e69-471f-8101-6abfdc041a28"
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},
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"outputs": [],
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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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"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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" 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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"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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]
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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 output waveform can be plotted:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"scrolled": false
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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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"plt.tight_layout()\n",
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"plt.show()"
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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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"# References\n",
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"Inspired from:\n",
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"“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)"
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]
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}
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],
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"metadata": {
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"colab": {
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"collapsed_sections": [],
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"include_colab_link": true,
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"name": "analog-inverter-magic.ipynb",
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"provenance": []
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},
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"kernelspec": {
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"display_name": "Python 3 (ipykernel)",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.12"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 1
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}
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