10_changelog.md

SemiDevKit — ChangeLog / Release Notes

This document summarizes all updates, improvements, and structural changes made to SemiDevKit. It is intended for version tracking, documentation updates, and module maintenance.

📌 Version 0.1.0 — Initial Structured Release

Date: 2025-01-01
Status: Public Alpha

🔧 Core Repository Setup

• Created top-level documentation files:
  • 1_install.md
  • 2_quickstart.md
  • 3_tutorials.md
  • 4_module_overview.md
  • 5_openlane_lite_usage.md
  • 6_troubleshooting.md
  • 7_faq.md
  • 8_directory_structure.md
  • 9_glossary.md
• Added standardized directory structure for all modules.

🚀 Module Updates

1. TCAD Playground (MOSFET/MOSCAP/Poisson)

• Added MOSFET Id–Vd / Id–Vg sweep models.
• Implemented MOSCAP CV analysis.
• Added Poisson 1D solver.
• Added auto-generated figures under fig/.

2. PZT Playground

• Added P–E hysteresis closed-loop model.
• Added composition and anneal-temperature variation models.
• Added Pm surface map & butterfly (S–E) curve generator.

3. BSIM4 Analyzer — DC

• Implemented VGID / VDID sweep automation.
• Added Vth (gmmax), gmmax, Idlin, Idsat extraction.
• Added .csv, .png, .dat, .log export formats.

4. BSIM4 Analyzer — CV

• Added physically correct NMOS/PMOS CV extraction.
• Implemented Cgg-only extraction policy (no partitioned caps).
• Automated batch simulation for LT/RT/HT.

5. BSIM4 Analyzer — DIM (L/W Sweep)

• Added DIM auto-generation for L/W sweeps.
• Added short-channel effect modeling:
  • Vth roll-off
  • DIBL scaling
  • Mobility degradation
  • RDSW width dependency
• Automated VGID / VDID plots per geometry.

6. BSIM4 Reliability Analyzer

• Added HCI (NMOS) and NBTI (PMOS) reliability framework.
• Included ΔVth, ΔId lin/sat, gm shifts.
• Added stress & VGID template separation.
• Added Python-based degradation modeling (t > 0).

7. Paramus Physical Edition

• Added physical-to-BSIM4 model-card generator.
• Added support for:
  • tox
  • Na
  • Vfb
  • mobility μ0
  • L/W geometry
• Added preset JSON-based technology definitions.

8. OpenLane-Lite

• Added minimal OpenLane environment with scripts:
  • docker/run_in_docker.sh
  • scripts/run_flow.sh
• Added example designs.
• Added PDK folder auto-check.

📁 Documentation Updates

New documents added:

• Changelog (this file)
• Glossary of semiconductor and modeling terms.
• Directory structure guidelines.
• Completed FAQ and troubleshooting guide.
• Added hybrid license summary references.

🛠 Planned for Next Release (v0.2.0)

✔ Documentation

• Example workflows (TCAD → BSIM → SPICE → Layout).
• Architecture diagram of the entire SemiDevKit flow.
• Module comparison table.

✔ Features

• TCAD 2D extensions (Poisson/DD-lite).
• BSIM4 parameter sweeping automation.
• Reliability Arrhenius model support (temperature dependence).
• OpenLane-Lite: add post-GDS analysis step.

✔ Repository

• Add CI checks for Python formatting.
• Add simulation validation script set.

🏁 Summary

SemiDevKit v0.1.0 establishes:

• A unified modeling-to-layout educational ecosystem
• Reproducible workflows
• A stable documentation framework
• Consistent directory and naming rules

Further releases will enhance physical accuracy, automation, and usability.