MicroSpice

This is a tiny spice parser and engine written in python that runs AC, DC and transient simulations for linear elements.

This demonstrates the bare basics of a SPICE engine. It is built with modularity, extensibility and simplicity in mind rather than runtime performace.

The project was first implemented in MATLAB as part of the "CAD for high speed circuits" course by Prof. Dipanjan Gope at IISc, Bangalore (Spring 2023) and then converted to python with the help of ChatGPT.

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Index

• examples : Example spice netlists
• docs : Code documentation
• microspice : Python source files
  • elements.py : Different elements supported in microspice
  • environment.py : The environment contains the components and connectivity information of a spice netlist
  • engine.py : The spice solver. Also handles different modes and simulation options
  • microspice.py : Toplevel interface for using microspice
  • parser.py : Parses the spice netlist
  • utils.py : Common utilities like unit and type conversion
  • error : Error handling functionality
• microspice_matlab : The original matlab implementation (for reference)
• run.ipynb : Example jupyter notebook to run microspice on the sample spice files

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Todo

• Simulation engine
  • Add AC and DC simulation options
• Elements
  • Add all linear components
  • Add support for nonlinear elements
• Code improvements
  • Redesign toplevel interface
  • Use native python exceptions for error handling
  • Make error handling more expansive
  • Logging
• Feature additions
  • Circuit visualization (as a graph)
  • Matrix visualization
• Documentation
  • Convert project report to markdown and document the implementation
  • Document supported spice constructs