ihp-gdsfactory 0.2.5

IHP pdk

IHP GDSFactory PDK

A GDSFactory-based Process Design Kit for the IHP SG13G2 130nm BiCMOS open-source technology. It provides parametric layout cells, design rule constants, simulation models, and example designs for tape-out-ready integrated circuits.

Quick start

Use Python 3.11, 3.12 or 3.13. We recommend VSCode as an IDE.

uv pip install ihp-gdsfactory --upgrade

Then you need to restart Klayout to make sure the new technology installed appears and start generating IHP-SG13G2 GDSII immediately!

import gdsfactory as gf
from ihp import PDK
from ihp.cells import nmos, rfnmos, npn13G2, rsil, cmim

PDK.activate()

# Create a parametric NMOS transistor
c = nmos(width=1.0, length=0.13, nf=4)
c.write_gds("my_nmos.gds")
c.show()  # opens in KLayout

Available devices

Category	Device	cells/ (pure GDSFactory)	cells2/ (PyCell)
FET	nmos	nmos	nmos
	pmos	pmos	pmos
	nmos_hv	nmos_hv	nmosHV
	pmos_hv	pmos_hv	pmosHV
RF FET	rfnmos	rfnmos	rfnmos
	rfpmos	rfpmos	rfpmos
	rfnmos_hv	rfnmos_hv	rfnmosHV
	rfpmos_hv	rfpmos_hv	rfpmosHV
Bipolar	npn13G2	npn13G2	npn13G2
	npn13G2L	npn13G2L	npn13G2L
	npn13G2V	npn13G2V	npn13G2V
	pnpMPA	pnpMPA	pnpMPA
Resistor	rsil (silicided poly)	rsil	rsil
	rppd (p-poly)	rppd	rppd
	rhigh (high-R)	rhigh	rhigh
Capacitor	cmim (MIM)	cmim	cmim
	rfcmim (RF MIM)	rfcmim	rfcmim
	cmom (MOM)	cmom	--
Inductor	inductor2	inductor2	inductor2
	inductor3	inductor3	inductor3
Passive	svaricap (MOS varicap)	svaricap	svaricap
	ESD protection	esd_nmos	esd
	ntap1 / ptap1	ntap1 / ptap1	ntap1 / ptap1
	guard_ring	guard_ring	--
	sealring	sealring	sealring
Diode	diodevdd 2kV/4kV	diodevdd_2kv / diodevdd_4kv	--
	diodevss 2kV/4kV	diodevss_2kv / diodevss_4kv	--
	schottky_nbl1	schottky_nbl1	--
Antenna	dantenna / dpantenna	dantenna / dpantenna	dantenna / dpantenna
Bondpad	bondpad	bondpad	bondpad

cells/ functions are fully parametric pure-Python implementations. cells2/ functions wrap the original IHP PyCell library (requires CNI runtime). Entries marked -- are only available in one implementation.

Project structure

ihp/
├── cells/                  # Pure GDSFactory parametric layout cells
│   ├── fet_transistors.py  #   NMOS/PMOS (standard & HV)
│   ├── rf_transistors.py   #   RF-MOSFETs with guard/gate rings
│   ├── bjt_transistors.py   #   SiGe HBTs (npn13G2, npn13G2L, npn13G2V, pnpMPA)
│   ├── resistors.py        #   Polysilicon & metal resistors
│   ├── capacitors.py       #   MIM & MOS capacitors
│   ├── inductors.py        #   Spiral inductors
│   ├── passives.py         #   Diodes, varactors, guard rings
│   ├── primitives.py       #   Schematic-only VLSIR elements (R, L, C, sources)
│   ├── via_stacks.py       #   Via stack generators
│   └── fixed.py            #   Pre-built GDS imports (SiGe HBTs, etc.)
├── cells2/                 # Legacy PyCell reference implementations (CNI-based)
├── models/                 # Compact models & SAX S-parameter models
├── gds/                    # Pre-built GDS files for complex cells
├── tech.py                 # Layer map, design rules, technology parameters
├── layers.yaml             # Layer definitions
└── config.py               # Paths and PDK configuration
tests/
├── test_cells.py           # GDS regression & settings tests for all cells
├── test_xor_transistors.py # Polygon-exact XOR tests (GDSFactory vs PyCell)
└── gds_ref/                # Golden reference GDS files
docs/                       # Jupyter Book documentation (Sphinx)

Key architectural concepts:

• cells/ contains pure GDSFactory implementations — each @gf.cell function builds geometry from scratch using add_polygon and design rule constants from tech.py. No external layout tools are needed at runtime.
• cells2/ holds the original IHP PyCell implementations (CNI/OpenAccess-based). These serve as the reference for XOR verification — every polygon in cells/ is tested to match cells2/ exactly.
• models/ provides SAX-compatible S-parameter models and a VLSIR bridge (to_vlsir.py) for SPICE netlist export.
• primitives.py provides schematic-only elements (ideal R, L, C, voltage/current sources) with VLSIR metadata for circuit simulation — these have no physical GDS geometry.

Installation

We recommend uv

# On macOS and Linux.
curl -LsSf https://astral.sh/uv/install.sh | sh

# On Windows.
powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

Installation for contributors

git clone https://github.com/gdsfactory/ihp.git
cd ihp
uv venv --python 3.12
uv sync --extra docs --extra dev
python install_tech.py

Running tests

make test              # run full test suite
make test-force        # run tests and regenerate reference GDS files

To run specific test subsets:

uv run pytest tests/test_cells.py -v          # GDS regression + settings tests
uv run pytest tests/test_xor_transistors.py -v # polygon-exact XOR vs PyCell

Documentation

• gdsfactory docs
• IHP docs from GDSFactory and code
• IHP documentation
• IHP component diagrams

License

Apache 2.0