MOSFET Characterization Plotter

A tool for parsing, analyzing, and visualizing MOSFET characterization data from CSV files. Automatically detects the measurement type and routes it to the correct parser and plot.

Features

• Auto-detection of measurement type based on column names
• Interactive plots with hover tooltips via mplcursors
• Supports the following characterizations:
  • RDSon — On-resistance vs VDS, grouped by VGS
  • IG — Gate current vs VGS, grouped by VDS
  • 3rd Quadrant — IDSabs vs VDSabs, grouped by VGS

Requirements

Install dependencies with:

pip install numpy matplotlib mplcursors

Python 3.11+ recommended.

Usage

python main.py

A file dialog will open — select a .csv characterization file. The tool will automatically detect the measurement type and plot it.

CSV Format

The tool expects CSV files in the following format:

DataName, VDS, IDS, VGS, RDSon
DataValue, 0.1, 0.5, 15.0, 0.015
DataValue, 0.2, 1.0, 15.0, 0.016
...

Column names are matched case-insensitively. Supported column names per measurement type:

Measurement	Required Columns
RDSon	VDS, IDS, VGS, RDSon
IG	VDS, VGS, IG or IGabs
3rd Quadrant	VDS, IDS, VDSabs, IDSabs

Project Structure

plotter/
├── main.py        # Entry point, file selection and routing
├── rdson.py       # RDSon parser and plot
├── igs.py         # IG parser and plot
├── quadrant.py    # 3rd Quadrant parser and plot
└── README.md

Roadmap

• Executable builds for Windows, macOS, and Linux
• GUI for file selection and settings
• Multiple file selection — plot all files automatically
• Improved 3rd Quadrant plot separation for better curve distinction
• Additional characterization parameters beyond the most common ones

License

MIT