In order to get the caravel_fulgor_opamp project running several tools and files need to be installed. To simplify the installation and to make sure you fullfill all the pre-requisites an install_pdk.sh script is provided. To run the script just type on the console:

./install_pdk.sh

This script does the following:

• Installs all the packages needed to use the opensource tools and the Google-Skywater 130nm Open Source PDK
• Clones & installs the Google-Skywater 130nm Open Source PDK
• Installs the schematic caputre tool XSCHEM
• Installs XSCHEM symbol library for the Google-Skywater 130nm Open Source PDK.
• Installs the simualtion engine ngspcie
• Installs the layout desing tool magic
• Installs the layput desing tool klayout
• Installs the LVS check tool netgen
• Installs the Open_PDKs
• Installs the pre-check tool for the Efabless/Skywater/Google Caravel project.

This project is a test chip, which contains several two stages operationals amplifiers with Miller compensation. This is an all analog desing implemented on the Google-Skywater 130nm Open Source PDK. It is an Open Source project underApache License 2.0.

The OpAmp desing is located in an Open Source SoC Harness obtained from the efabless Caravel Project.

To run xschem and be able to simulate the OpAmp's test benches the following commands need to be run:

cd caravel_fulgor_opamp/xschem
xschem

In the xschem folder it is found the xschemrc file, where the paths to the xschem libraries are defined.

To run magic and be able to edit or desing a layout the following commands need to be run:

cd caravel_fulgor_opamp
magic -rcfile mag/dh.magicrc

The dh.magicrc file specifies where the open_pdk layout libraries are located. If magic is used without the -rcfile specification, the sky130 library won't be loaded.

• Vdd = 1.8V
• Iref = 100uA
• Power Consumption = ~2.7uW
• DC Gain = ~20dB Closeloop
• Bandwidth = 40MHz
• Output Noise = ~300uV