skill

MOSFET IV Characterization Visualizer

Public Made by Adom

by adom

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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name: mosfet-visualizer description: Use when the user wants to visualize MOSFET IV curves, plot drain current vs drain-to-source voltage, characterize MOSFETs, overlay IV data from multiple devices, compare MOSFET devices, or analyze MOSFET parameters (Vth, Rds_on, gm). Trigger phrases include "MOSFET IV", "IV curves", "characterize MOSFET", "drain current", "Vds vs Id", "plot MOSFET", "MOSFET visualizer", "saturation boundary", "knee point", "curve tracer data".

MOSFET IV Characterization Visualizer

Interactive web-based visualizer for MOSFET IV curves (Id vs Vds). Supports multiple Vgs sweeps, device overlay, saturation boundary detection, and real-time API control.

Server: http://127.0.0.1:8778 Source: /home/adom/project/mosfet-visualizer/

Quick Start

1. Ensure the server is running

curl -sf --max-time 2 http://127.0.0.1:8778/health > /dev/null 2>&1 || bash /home/adom/project/mosfet-visualizer/start-mosfet-visualizer.sh

2. Open the visualizer

Open a Web View tab pointing to /proxy/8778/viz using the workspace API:

adom-cli hydrogen workspace add-tab \
  --panel-id "<PANE_ID>" \
  --panel-type "adom/a1b2c3d4-0031-4000-a000-000000000031" \
  --display-name "MOSFET IV Visualizer" \
  --display-icon "mdi:chart-line" \
  --initial-state '{"url":"<PROXY_BASE>/proxy/8778/viz"}'

Replace <PANE_ID> with a leaf pane ID from adom-cli hydrogen workspace get and <PROXY_BASE> from $VSCODE_PROXY_URI.

3. Load data

Sample data:

curl -s -X POST http://127.0.0.1:8778/ \
  -H 'Content-Type: application/json' \
  -d '{"action":"sample"}'

CSV from curve tracer:

CSV=$(cat /path/to/sweeps.csv)
curl -s -X POST http://127.0.0.1:8778/ \
  -H 'Content-Type: application/json' \
  -d "{\"action\":\"plot_csv\",\"device\":{\"id\":\"DUT1\",\"name\":\"My MOSFET\"},\"csv\":$(python3 -c \"import json,sys; print(json.dumps(sys.stdin.read()))\" <<< \"$CSV\"),\"filename\":\"sweeps.csv\"}"

JSON sweeps:

{
  "action": "plot",
  "device": { "id": "IRF540N-s1", "name": "IRF540N", "type": "NMOS" },
  "sweeps": [
    { "vgs": 4.0, "data": [{ "vds": 0, "id": 0 }, { "vds": 1, "id": 0.25 }, { "vds": 5, "id": 0.5 }] },
    { "vgs": 6.0, "data": [{ "vds": 0, "id": 0 }, { "vds": 1, "id": 1.8 }, { "vds": 5, "id": 4.5 }] }
  ]
}

API Actions (POST / with JSON body)

Action Description
plot Add device with JSON sweeps
plot_csv Add device from curve tracer CSV
overlay Add multiple devices at once
sample Load built-in demo data
clear Clear all data
remove Remove device by id
toggle_device Toggle device visibility (eyeball)
toggle_sweep Toggle individual sweep visibility
compute_saturation Compute and show saturation boundary line
clear_saturation Hide saturation boundary
set_config Change settings (e.g., {"scale":"log"})
analyze Extract Vth, Rds(on) from data

All actions update the frontend in real-time via WebSocket — no page refresh needed.

CSV Format

The CSV must have column triplets per sweep: VN (V), IN (A), RN (Ohm) where N is 1-indexed:

V1 (V),I1 (A),R1 (Ohm),V2 (V),I2 (A),R2 (Ohm),...
38.32,0.0009,...

Optionally pass vgs_values: [0, 1, 2, ...] to label sweeps with their Vgs voltages.

Real-Time Control

The server has a WebSocket at ws://127.0.0.1:8778/ws. Claude can control the visualizer live during demos:

# Toggle a device's visibility
curl -s -X POST http://127.0.0.1:8778/ -H 'Content-Type: application/json' \
  -d '{"action":"toggle_device","id":"DUT1"}'

# Compute saturation boundary
curl -s -X POST http://127.0.0.1:8778/ -H 'Content-Type: application/json' \
  -d '{"action":"compute_saturation"}'

# Switch to log scale
curl -s -X POST http://127.0.0.1:8778/ -H 'Content-Type: application/json' \
  -d '{"action":"set_config","scale":"log"}'

Shot Log

Monitor API activity: curl http://127.0.0.1:8778/shotlog?tail=10

Example AI Prompts

Users can ask Claude:

  • "Plot my MOSFET IV curves from this CSV file"
  • "Show me the MOSFET visualizer with sample data"
  • "Overlay my BSS138 data on top of the IRF540N"
  • "Compute the saturation boundary curve"
  • "What's the threshold voltage of this MOSFET?"
  • "Switch to log scale to see subthreshold behavior"
  • "Export the IV data as CSV"
  • "Toggle off sweep 3 so I can focus on the others"
  • "Compare these two MOSFETs side by side"

Keyboard Shortcuts (in the visualizer)

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