IHP_OpenPDK_eSim.md

Integration of IHP OpenPDK with eSim

Overview

This contribution demonstrates the integration of the IHP OpenPDK with eSim to enable CMOS circuit design and simulation using open-source EDA tools.

Objective

• Integrate IHP OpenPDK MOSFET SPICE models with eSim
• Design and simulate a CMOS inverter
• Perform DC sweep and transient analysis
• Validate inverter switching behavior

Tools Used

• eSim (KiCad + NgSpice)
• IHP OpenPDK
• NgSpice

Circuit Implemented

• CMOS Inverter using IHP NMOS and PMOS models
• Supply voltage: 1.8V

Simulations Performed

Transient Analysis

• .tran 0.1ns 20ns
• Verified correct logical inversion

DC Sweep Analysis

• .dc VIN 0 1.8 0.01
• Verified voltage transfer characteristics

Results

• Correct inverter operation observed
• Threshold voltage near mid-supply
• Stable transient and DC behavior

Notes

• Absolute paths were used for SPICE model inclusion
• Convergence issues resolved by reducing timestep

Report and Demo

The detailed report and demonstration video are provided via links in the corresponding GitHub Pull Request.