analog-generators

BAG scripts for analog design, simulation, and layout.

Obey the NDA

Do not under any circumstances put proprietary information in this repository!

Best Practices

• Naming convention: FUNCTION_topologyName_yourName.py
  • Examples of FUNCTION: OTA, TIA, OPAMP, REFERENCE, DAC
  • Examples of topologyName: diffAmpN, diffAmpP, foldedCascodeP, foldedCascodeN, bandgap, constantGm
  • Example of a file name: OTA_diffAmpN_lydiaLee.py
• At the top of each generator, include the following:
  • Name
  • Semester/Year: Last updated or created

Process Characterization

0. Source the .cshrc (with csh)
   • source .cshrc
1. On the cluster, run Cadence Virtuoso
   • virtuoso &
   • The ampersand (&) will allow you to continue using the terminal normally even when Virtuoso is running
2. Add the necessary cds.libs to your default cds.lib
   • Add this to your cds.lib: INCLUDE $BAG_WORK_DIR/cds.lib.core
3. In the Virtuoso CDF window, start a BAG server:
   • load("start_bag.il")
   • Wait until the Virtuoso window indicates a BAG server has been started
4. Create a .yaml file to configure your characterization settings
   • Templates have been provided in specs_mos_char/nch_w0d5_100nm.yaml and specs_mos_char/pch_w0d5_100nm.yaml
   • The templates characterize using schematic only (view_name: 'schematic')
5. Copy scripts_char/mos_char.py and modify the copy to point to the .yaml file you'd like to use for characterization settings
6. Start BAG
   • ./start_bag.sh
7. Run the script you created in (4)
   • run -i ./path-to-your-script/your-script.py
   • The '-i' flag isn't mandatory, but it's useful for debugging
8. Wait
   • Depending on what you're running, this could take a while
   • Noise simulations in particular take a long time

Running Your Own Scripts

0. Source the .cshrc (with csh)
   • source .cshrc
1. If you need to interface with Virtuoso:
   1. On the cluster, run Cadence Virtuoso
      • virtuoso &
      • The ampersand (&) will allow you to continue using the terminal normally even when Virtuoso is running
   2. In the Virtuoso CDF window, start a BAG server:
      • load("start_bag.il")
      • Wait until the Virtuoso window indicates a BAG server has been started
2. Start BAG in Terminal
   • ./start_bag.sh
3. Run the script you created
   • run -i ./path-to-your-script/your-script.py
   • The '-i' flag isn't mandatory, but it's useful for debugging