README.md

XSCHEM Device symbols for the Google-Skywater SKY130 Process Design Kit (PDK)

Warning: This is currently Work in progress.

This directory contains symbols to be used in the XSCHEM schematic editor. For a quick XSCHEM introduction see this presentation.
These symbols represent the available silicon devices as documented on the Skywater-pdk website in the device details section.

GOAL

Provide a set of symbols that can be used to draw circuit schematics in XSCHEM. Netlists in various target formats can be extracted for simulation or Layout vs Schematic checks. The set of symbols is designed to correctly link to the Skywater PDK model files, allowing to seamlessly simulate the circuit with SPICE simulators. A good tutorial for starting with xschem and Sky130 pdk can be found here. Thanks Bluecmd!

SYMBOL DRAWINGS

Up to now this is the list of devices that have been created. There are a lot of missing devices, as this is a work in progress and the whole PDK is evolving.

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DEVICE LIST

File name	Description
diode.sym	Diode used to describe various p-n junction between p-n wells and p-n diffusions
lvsdiode.sym	Diodes used for LVS matching ? or for parasitic
nfet_01v8_lvt.sym	1.8V low threshold N-type Fet
nfet_01v8.sym	1.8V standard N-type Fet
nfet_03v3_nvt.sym	3.3V native threshold N-type Fet
nfet_05v0_nvt.sym	5V native threshold N-type Fet
nfet_20v0.sym	20V Vds, 5V Vgs N-type Fet
nfet_20v0_zvt.sym	20V Vds, 5V Vgs 'Zero threshold' N-type Fet
nfet_20v0_iso.sym	20V Vds, 5V Vgs N-type Fet in insulated p-well (uses deep nwell)
nfet_20v0_nvt.sym	20V Vds, 5V Vgs N-type Native Vth Fet in insulated p-well (uses deep nwell)
nfet_g5v0d10v5.sym	10.5V Vds, 5V Vgs N-type Fet
nfet_g5v0d16v0.sym	16V Vds, 5V Vgs N-type FET
pfet_01v8_hvt.sym	1.8V high threshold P-type Fet
pfet_01v8_lvt.sym	1.8V low threshold P-type Fet
pfet_01v8.sym	1.8V standard P-type Fet
pfet_20v0.sym	20V Vds, 5V Vgs P-type Fet
pfet_g5v0d10v5.sym	10.5V Vds, 5V Vgs P-type Fet
pfet_g5v0d16v0.sym	16V Vds, 5V Vgs P-type FET
pnp_05v5.sym	5V Vce PNP bipolar transistor
res_generic_nd.sym	N diffusion generic resistor
res_generic_pd.sym	P diffusion generic resistor
res_generic_po.sym	Generic Poly resistor
res_high_po_0p35.sym	High precision Poly resistor, 0.35um width
res_high_po_0p69.sym	High precision Poly resistor, 0.69um width
res_high_po_1p41.sym	High precision Poly resistor, 1.41um width
res_high_po.sym	High precision Poly resistor, custom size
res_iso_pw.sym	P-Well Poly resistor
res_xhigh_po_0p35.sym	High precision High resistivity Poly resistor, 0.35um width
res_xhigh_po_0p69.sym	High precision High resistivity Poly resistor, 0.69m width
res_xhigh_po_1p41.sym	High precision High resistivity Poly resistor, 1.41um width
res_xhigh_po.sym	High precision High resistivity Poly resistor, custom size
cap_mim_m3_1.sym	Metal3 Insulator Metal4 (MIM) capacitor
cap_mim_m3_2.sym	Metal4 Insulator Metal5 (MIM) capacitor
vpp_cap.sym	Vertical parallel plate metal capacitors
cap_var_lvt.sym	Variable capacitance (Varactor), LVT version
cap_var_hvt.sym	Variable capacitance (Varactor), HVT version
vpp_cap.sym	Vertical Parallel Plate (VPP) capacitors

SYMBOL IMAGES

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