skill

MOSFET IV Characterization Visualizer

Unreviewed

by Kyle Bergstedt

Interactive web-based visualizer for MOSFET IV curves (Id vs Vds). Plot multiple Vgs sweeps, overlay devices, compute saturation boundaries, and extract Vth/Rds(on) — all controllable via API in real-

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skill / mosfet-visualizer
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Not installable via adompkg

This skill has no published release. adompkg install kyle/mosfet-visualizer will not work until a maintainer publishes a tarball with install.sh and uninstall.sh.

See the publishing docs for the package.json schema and tarball layout required to ship this skill.

MOSFET IV Characterization Visualizer

Interactive web-based visualizer for MOSFET IV curves. Plot Drain Current (Id) vs Drain-to-Source Voltage (Vds) with multiple gate voltage (Vgs) sweeps, overlay data from different devices, compute saturation boundaries, and extract device parameters.

Features

  • Multiple Vgs sweep curves with per-sweep color coding
  • Device overlay — compare multiple MOSFETs on the same chart
  • Custom legend — eyeball toggle per device and per sweep, sweep count badges
  • Saturation boundary detection — compute the linear/saturation region boundary via knee detection algorithm
  • Parameter extraction — threshold voltage (Vth), on-resistance (Rds_on)
  • Linear/Log scale toggle — essential for subthreshold characterization
  • Crosshair cursor with hover tooltip showing exact Vds, Id, Vgs values
  • Export — PNG, SVG, CSV, JSON
  • CSV import — drag-and-drop curve tracer CSV files directly onto the chart
  • Real-time API control — WebSocket pushes all state changes to the frontend instantly
  • Shot log — monitor all API calls with timestamps and durations

Data Formats

JSON Sweeps

{
  "action": "plot",
  "device": { "id": "IRF540N", "name": "IRF540N", "type": "NMOS" },
  "sweeps": [
    { "vgs": 4.0, "data": [{ "vds": 0, "id": 0 }, { "vds": 5, "id": 0.5 }] }
  ]
}

Curve Tracer CSV

Column triplets per sweep: VN (V), IN (A), RN (Ohm) — auto-detected from headers.

AI Prompts

Prompt What it does
"Plot my MOSFET IV curves from this CSV file" Reads CSV, sends to visualizer
"Show me the MOSFET visualizer with sample data" Starts server, loads demo, opens panel
"Compute the saturation boundary curve" Runs knee finder, draws red dashed parabola
"What's the threshold voltage?" Analyzes data, extracts Vth
"Switch to log scale" Toggles Y-axis to log10
"Overlay my BSS138 data on the IRF540N" Adds second device for comparison

Keyboard Shortcuts

Key Action
L Toggle linear/log scale
K Compute/clear saturation curve
S Load sample data
R Reset zoom

Architecture

  • Server: Node.js HTTP + WebSocket (port 8778)
  • Frontend: Self-contained HTML with Plotly.js
  • Brand: Adom dark theme (teal #00b8b0)